BOILER

Steam Plant System Outline:

Feed Water System:

The steam plant uses a closed feed system with feed collecting in the enclosed feed tank. In order to increase the steam cycle efficiency and reduce oxygen in the feed water, the enclosed feed tank has a steam heating coil to maintain the temperature in the tank at 90°C. This feed temperature should be maintained for both auxiliary boiler operation and exhaust gas economizer operation. Vapor and air are removed from the enclosed feed tank, to vent condenser by an exhaust fan.

The steam plant has two feed water pumps which pump feed from the enclosed feed tank to the auxiliary boiler and economizer.  Normally feed is supplied to the auxiliary boiler from the main feed line and feed regulator. The auxiliary feed to the boiler is used as an alternative feed supply in an emergency, or filling the boiler for a wet lay up.

Normally the feed is supplied to the economizer through the main feed line, and is heated in the pre-heater section of the economizer. All economizer feed should pass through the pre-heater.  At the outlet of the pre-heater the feed water is separated into two directions. Part of the feed water passes through the low pressure evaporator flow control valve and is used to generate low pressure (4 kg/cm²) steam in the L.P evaporator. The remainder of the feed passes through the feed regulator into the high pressure steam separator.

Condensate System:

The condensate system consists of the turbo-alternator condenser, which is cooled with sea water by one of the turbo-alternator condenser cooling sea water pumps. The two pumps, pump condensate through the air ejector gland condenser, the vent condenser and its by-pass orifice. The condensate system must be operational at all times when feed system is in use.

If the turbo alternator is in operation the air ejector must be in use to maintain a vacuum at the condenser. If the turbo-alternator is not is not in use the condenser can be used as an atmospheric condenser and the steam side of the air ejector need not be started.

Low Pressure Steam System (4 Kg/cm²):

When the auxiliary boiler is in operation the 4K steam is reduced from 7K steam through a reducing valve. When the exhaust gas economizer is in operation the 4K steam is produced in the L.P evaporator section of the economizer and the reducing valve will shut automatically.  If the low pressure steam pressure falls to 3.9 Kg/cm² the reducing valve open to make up pressure. If pressure in the low pressure steam line rises to 4.1 Kg/cm², the 4 Kg/cm² dump valve will open and relieve pressure to turbo-alternator condenser. 4K steam is used for tank heating, purifiers and main engine heaters, and steam tracing service.

7 Kg/cm² Steam System:

7K Steam is produced in the auxiliary boiler; it is used for soot-blowing (auxiliary boiler) and for reducing to 4K steam service when the economizer is not operational.

9.5 Kg/cm² Steam System:

This high pressure steam is generated in the economizer high pressure evaporator and is stored in the high pressure steam separator as saturated steam. This saturated steam is used for economizer soot-blowing, air ejector steam and saturated steam supply to the super heater. When the economizer is in operation the excess steam in the high pressure steam system is relieved to the turbo alternator condenser through the H.P dump valve. This is set at 9.5 Kg/cm² .

MOTOR NOTES FROM USCG QUESTIONS

BOILERS

Where is a fusible plug installed on a Scotch or   auxiliary boiler?/At or near the center of the crown sheet of the combustion chamber.

Fusible plugs are installed in fire-tube boilers to   _____________./warn the engineer of low water level

If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition after a normal shutdown, you should check for a/an __________./faulty photocell detector

Before any work is to be carried out on a burner in an  automatically fired auxiliary boiler, you should always  _____________./close all manually operated fuel valves

Generating tubes in waste heat boilers are finned to  ____________./increase the rate of heat transfer

If an operating auxiliary boiler has a water pH reading of 7, you should ______________./treat the water with caustic soda

Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in an  auxiliary boiler?/Expansion of the steam in the furnace.

A failure to any component of a flame safeguard control for an automatically fired auxiliary boiler, will result in  ______________./the prevention of automatic restart

When an auxiliary boiler is on the line, the output of the flame scanner can be checked by placing a microammeter in series with the photoelectric cell circuit. The readings on high fire should be ____________./higher than those at low fire

A feed pump for an auxiliary boiler might lose suction if the ____________./feedwater is too hot

The water in a steaming auxiliary boiler should be tested daily for ______________./chlorides

The programmed control system of an automatic auxiliary  boiler will terminate the light off process during the  prepurge period if air flow is not sensed and _________./the damper is not sufficiently open

The flame safeguard control system of a large automatic  auxiliary boiler will provide fuel shut off in the case of high ____________./steam pressure

The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to _________________./reduce corrosion in the heating coil

Coast Guard Regulations (46 CFR) require the controls for automatically fired auxiliary boilers, must be fitted with visible indicators to signal __________./fuel oil shutoff due to flameout

When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used ____________./at low loads to prevent corrosion in the boiler

How is the concentration of dissolved oxygen in the   feedwater of an auxiliary boiler maintained at acceptable limits?/Oxygen is liberated by maintaining the highest practical feedwater temperature.

Which of the listed types of control systems is required by Coast Guard Regulations (46 CFR) for large automatic  auxiliary boiler heating equipment?/All of the above

Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer?/Control of evaporation

When it becomes necessary to replace any tubes in a   water-tube auxiliary boiler to eliminate leaks at the tube seats, the replacement tubes should be ____________./rolled, beaded, and seal welded around the bead edge

Automatic combustion control systems for some auxiliary  boilers are designed to cycle burners on in response to  ____________./low steam pressure

It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to __________./prevent wire drawing of the disc and seat

Coast Guard Regulation (46 CFR) requires that after   undergoing extensive repairs, an auxiliary boiler, with a maximum allowable working pressure of 60 psig (411.89 kPa), should be hydrostatically tested at a pressure of   ______________./90 psig (617.83 kPa)

The purpose of the programmed purge cycle on an    automatically fired auxiliary boiler is to _______________./remove explosive vapors from the furnace

An auxiliary boiler equipped with a return flow fuel atomization system, has a _____________./variable fuel return pressure

Heavy soot accumulations in an auxiliary boiler could be caused by _____________./improper burner maintenance

Prior to lighting off a cold automatically fired auxiliary boiler, you should _____________./check and regulate the water level

Within the cycle of a forced circulation auxiliary   water-tube boiler, part of the water flashes into steam, and the remaining hot water is _________________./collected in the lower portion of the steam accumulator  for recirculation back to the heating coil or water tank

Ignition failure in an automatically controlled auxiliary boiler could be caused by _____________./carbon deposits on the flame scanner

In a coil-type auxiliary water-tube circulation boiler  _____________./unevaporated feedwater collects in the bottom of the flash chamber

A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by ____________./an unevenly shaped burner flame

Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?/The high limit control secures power to the entire oil  firing system.

Throttling a burner air register on an auxiliary boiler  could result in ____________./smoky boiler operation

A burner producing black smoke in an automatic auxiliary boiler, would be caused by a/an ______________./incorrect primary air setting

Which of the following actions should be taken when an  auxiliary boiler is operation?/Inspect for oil and water leaks.

Failure of the burner flame in an automatic auxiliary boiler would probably be a result of ______________./water in the fuel oil

If the flame of an automatically fired auxiliary   boiler tends to move away from the burner tip when the  firing rate is changed from low to high, you should   ____________./adjust damper linkage to slow the opening rate of the  dampers

Which of the following procedures decreases the total  dissolved solids concentration in the water of an auxiliary boiler?/Bottom blowing

If the fire goes out in an automatically fired auxiliary boiler and the burner continues to supply fuel, there is a potential danger of ______________./a severe furnace explosion

Improper maintenance of an automatic auxiliary boiler oil burner could result in ______________./decreased boiler efficiency

In accordance with Coast Guard Regulations (46 CFR), water level controls utilized in a small automatically fired  auxiliary heating boiler, shall be tested ______________./slowly by lowering the boiler water level

After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to  prevent the immediate refiring of a burner in order for the ________________./furnace to be repurged

When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil ____________./back to the suction side of the service pump

Which of the following conditions will cause only one  of the burner solenoid valves to close on an automatically fired, two burner unit, auxiliary boiler?/A faulty coil in one of the solenoid valves

The burner assembly on an automatically fired auxiliary  boiler fitted with variable capacity, pressure atomizing burners, maintains steam pressure by ______________./changing fuel oil return pressure

While an auxiliary boiler is operating at design load, which of the following actions will occur if the automatic  combustion control system detects a steam pressure drop?/The fuel oil valve and air damper will open wider.

According to Coast Guard Regulations (46 CFR), when an  automatically fired boiler has a flameout, which of the  following actions should occur FIRST?/The fuel valve should be de-energized.

The water in an auxiliary boiler should be chemically tested daily for alkalinity and _________________./chloride content

The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent  ____________./explosions in the boiler furnace

The purpose of designing some waste heat boilers with  sinuous fire tubes, is to ____________./increase the rate of heat transfer to the waterside

The amount of chloride content in the water of an auxiliary boiler can be reduced by ____________./blowing down the boiler

The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______________./water level is abnormally low

In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?/The boiler vent valves should be opened.

Constant capacity pressure atomizing fuel oil burners  installed on automatically fired auxiliary boilers, respond to variations in load demand by ____________./automatically cycling the burner on and off

Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?/Excessive feedwater temperature

Coast Guard Regulations (46 CFR) specify that the fuel oil ignition system, on a small automatically fired auxiliary boiler, shall be energized ____________./only before, or simultaneously with, the opening of the fuel oil valve

The amount of oil atomized by the return flow variable  capacity atomizer, used with some automatically fired  boilers, is controlled by the _______________./oil pressure in the oil return line

An automatically fired auxiliary boiler is required by Coast Guard Regulations (46 CFR) to be shutdown as a result of ____________./low water level

Fins are installed on the generating tube surfaces in waste heat boilers to ____________./increase the rate of heat transfer

Subtracting the return flow meter reading from the supply flow meter reading on a boiler equipped with a return flow fuel oil system, determines the amount of oil ____________./burner throughput

In a fire-tube auxiliary boiler, you should expect to find the thickest scale on the waterside of the ____________./crown sheet

If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ____________./abnormally high feedwater temperature

When lighting off an auxiliary boiler, which of the   problems listed could cause the burners to sputter?/Water in the fuel oil

Which of the following actions should normally be taken  during each watch when the auxiliary boiler is in operation?/Inspect for oil or water leaks.

When there is a flame failure in an automatically fired  auxiliary boiler, the ____________./fuel supply is shut off

Excessive vibration of an automatically fired auxiliary  boiler can be caused by _____________./combustion pulses

Burner ignition failure in an automatically fired auxiliary boiler would be caused by ____________./a burned out solenoid in the oil supply valve

The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner _______________./in the event of a flame failure

The water in an auxiliary boiler should be tested for  chloride content to determine ______________./salt contamination

According to Coast Guard Regulations (46 CFR), the fuel  strainer installation located in the supply lines to the fuel pump of an auxiliary boiler, can be provided with  _________./all of the above

Excessive return oil pressure from a variable capacity  return flow fuel oil burner system on an automatic auxiliary boiler, will cause ____________./burner smoking

The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of __________./seawater contamination

Automatic burner shutdown in an auxiliary boiler, as a  result of a component failure in the flame safeguard  controls, will _______________./prevent the boiler from automatically relighting

When an auxiliary boiler is secured and you expect to  relight the unit within six hours, you should _____________./maintain a head of steam not less than 10 psig

If the combustion control system of an automatically fired auxiliary boiler fails to restart from the normal shutdown mode, you should check for ______________./all of the above

Bottom blow valves are installed on auxiliary water-tube boilers to _____________./remove suspended and precipitated solids from the boiler water

The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each __________./day

Coast Guard Regulations (46 CFR) require that the flame  safeguard control system for an automatic boiler, should _____________./be capable of closing the fuel valves in not more than 4 seconds after a flame failure

Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in a auxiliary boiler return flow fuel oil system?/Through tangential slots in the sprayer plate.

For proper operation, auxiliary boiler feedwater must have which of the following characteristics?/Proper alkalinity

The most common cause of scale formation in an auxiliary boiler is ______________./concentrations of calcium sulfate in the boiler water

Before an auxiliary boiler is shutdown for an extended  period of time, the water in the boiler should have a pH value of ____________./10

Which of the following statements concerning automatically controlled auxiliary boiler system alarms complies with  applicable Coast Guard Regulations (46 CFR)?/Visible indicators require manual resetting.

Excessive alkalinity of the water in an auxiliary boiler can cause ____________./caustic embrittlement of the boiler metal

Two solenoid control valves are required on large automatic auxiliary boilers, and will simultaneously shut off the fuel in the event of _______________./low water

Diesel engine waste heat boiler construction is usually of the fire-tube or _____________./water-tube type

The procedures recommended for auxiliary boilers having high salinity include ____________./securing the boiler and giving it a bottom blow

The solenoid valves in the fuel oil supply line to an  automatically fired auxiliary boiler, are automatically  closed by ______________./high steam pressure

In the event of a flame failure in an auxiliary water-tube boiler, you must ______________./purge the furnace of any combustible gases before attempting to relight the fire

Improper maintenance of the fuel oil burners in an   automatically fired auxiliary boiler, could result in  ____________./increased fuel consumption

The concentration of dissolved solids in the boiler water of an auxiliary boiler could increase as a result of  ___________./phosphate treatment

Failure of the feed pump to deliver feedwater to an   auxiliary boiler could be caused by _______________./grounded probes in the water level control

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?/To ensure that the valve will not be seized shut when hot.

Flame failure in an automatically fired auxiliary boiler can result from a/an ______________./clogged fuel nozzle

If the fuel/air ratio in an automatically fired auxiliary boiler is insufficient, the result could lead to __________./all of the above

Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?/Observe general boiler performance

Under which of the following conditions must the combustion control system for a small automatic auxiliary boiler secure the burner?/Flame failure

A pulsating flame, accompanied by a burner developing black smoke in an auxiliary boiler, is an indication that the  _____________./fuel oil pressure is too low

Which of the following actions should normally be taken during each watch when the auxiliary boiler is operation?/Blow down the water gage glass

Flame failure in an operating automatically fired auxiliary boiler can result from a _____________./clogged fuel nozzle

A failure of any component of a flame safeguard control for an auxiliary boiler will result in ____________./automatic burner shutdown

The daily inspection of an operating auxiliary boiler should include ____________./checking for external fuel and water leaks

If a tube ruptures in a water-tube auxiliary boiler due to low water, you should ____________./secure both the fires and the feed inlet valve

An automatically fired auxiliary boiler with carbon deposits formed on its burner electrodes, will experience _________./ignition failure

An exhaust gas bypass is installed on a waste heat boiler in order to ____________./minimize moisture condensation in the boiler gas passages at low loads

The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler _____________./burner flame is extinguished

The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to ____________./prevent boiler corrosion at low engine loads

Oxygen corrosion in auxiliary boilers is prevented by  treating the boiler feed tank with either sodium   ____________./sulfite or hydrazine

A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid  boiler ____________./corrosion at low engine loads

The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ___________./seawater contamination

Which of the listed sequence of events occurs when an automatic auxiliary boiler is prepurged?/The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position.

High stack temperature occurring in an auxiliary boiler could be a result of ____________./secondary combustion in the uptake

A firebox explosion in an automatically fired auxiliary boiler may be the result of ______________./insufficient purging before lighting off

The PRIMARY function of a waste heat boiler is to _________./recover heat which otherwise would be lost

A coil-type automatically fired auxiliary boiler is to be laid up wet for an indefinite period. The boiler water should be treated to ensure that ____________./the manufacturer's recommended pH is maintained

Coast Guard Regulations (46 CFR) require all automatically fired low pressure heating boilers to have an automatic  ____________./fuel cutoff as a result of low water

Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a ___________./steam pressure sensing device with linkage to the damper air vanes

A safety valve on an auxiliary boiler simmers constantly and can not be stopped by several quick blow-offs using the hand relieving gear. The problem may be __________./a damaged seat

A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a __________./dirty fuel nozzle

Which of the following types of feedwater regulators is  commonly used with a water-tube, natural circulation,  auxiliary boiler?/Thermo mechanical

A SECONDARY function of a waste heat boiler is to _________./reduce engine exhaust noise

An auxiliary boiler is equipped with a return flow fuel  atomization system, which uses a/an _____________./constant fuel supply pressure

Overfiring of a hot water boiler may be caused by _________./faulty limit controls

The pressuretrol is installed on an auxiliary boiler to  sense steam pressure changes, it _______________./automatically regulates the quantity of oil and air flow to the burner

If the combustion control system of an automatically fired auxiliary boiler fails to relight the burner after a normal shutdown, you should check for a/an ____________./faulty photocell detector

A waste heat boiler is installed on some diesel propelled vessels to _____________./provide steam for the turbogenerator

Why should handhole gaskets not be allowed to leak on an auxiliary boiler?/The gasket and its seating surface may become wire drawn.

Automatic combustion control systems for auxiliary boilers are designed to cycle burners on and off in response to the _______________./steam pressure

The variation in the amount of fuel oil burned in the  operation of an auxiliary boiler, utilizing a return flow type atomization system, is a function of the _____________./fuel oil back pressure

Which of the following conditions could cause black smoke to be discharged from the stack of an auxiliary boiler equipped with turbine-driven rotary cup atomizers?/Improper turbine shaft speed in the atomizer assembly.

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ____________./gas temperature

Which of the listed parts on a fire-tube auxiliary boiler requires a written report to the Officer-in-Charge of Marine Inspection when renewed?/Fusible plugs

Automatic combustion control systems for some auxiliary  boilers are designed to cycle burners on and off in response to ____________./steam pressure

Waterside scale in a fire-tube boiler may cause ___________./overheated tubes

When an auxiliary boiler is panting and emitting black  smoke, you should _____________./increase the air supply

Bottom blow valves are installed on auxiliary water-tube boilers to _____________./remove settled solids from the water drum

The correct procedure for giving an auxiliary boiler a  bottom blow, is to begin _____________./when the boiler has been secured long enough for most solids to settle

With which of the following types of diesel engine   arrangements is a waste heat boiler most likely to produce the maximum steam pressure, temperature, and flow   conditions?/Supercharged, four-stroke/cycle diesel engine

During maintenance inspections of a fire tube auxiliary  boiler, you should check for _____________./all of the above

The constant capacity, pressure atomizing, fuel oil burners designed to meet a wide variation in the steaming loads of an auxiliary boiler, are ________________./automatically cycled on and off in response to demand

Coast Guard Regulations (46 CFR) permit tubular type water gage glasses on auxiliary boilers, provided the maximum  allowable working pressure does not exceed ________./250 psi

In an automatically fired auxiliary boiler, restarting from the normal shutdown cycle in response to steam demand, is initiated by a/an ______________./pressuretrol measuring only the steam pressure

Which of the following methods is typically employed in the design of waste heat boilers to obtain maximum heat   transfer, while maintaining low overall weight?/Steel fins are installed on the generating tube surfaces to increase the effective surface area.

According to Coast Guard Regulations (46 CFR), which of the following pressures is the highest boiler pressure where a tubular type gage glass may be installed?/250 psig

At the beginning of the prepurge period on an automatic auxiliary boiler equipped with a programmed control system, the unit will not restart if airflow is not sensed and  ______________./the damper is not sufficiently opened

A properly adjusted safety valve for an auxiliary boiler will ____________./open with a sharp, clear pop at its set pressure

When conducting a hydrostatic test on a water-tube   auxiliary boiler, the test water should be heated to a temperature of at least 70°F. This is done to  ____________./help prevent the formation of condensation on the tube  exteriors

A photoelectric cell installed in an automatically fired auxiliary boiler burner management system ________________./opens the burner circuit upon sensing a flame failure

The maximum allowable working pressure on a packaged auxiliary boiler is 200 psig. The normal working pressure for one particular packaged boiler is 175 psig. Which of the following safety relief valve settings would be proper for this boiler?/195 psig

Coast Guard Regulations (46 CFR) require that oil fired automatic steam boilers, and hot water boilers shall be equipped with a prepurge programming control that will  assure at least ______________./4 air changes

A smoking burner with a pulsating flame in an auxiliary boiler, is an indication that the ______________./fuel/air ratio is incorrect

On an automatically fired auxiliary boiler, the steam pressure limit switch is wired into the burner electric  circuit to ______________./shut off the burner when the cutoff pressure is reached

Excessive vibration from an auxiliary boiler could be caused by ____________./all of the above

After lighting off a cold, automatically fired, auxiliary boiler, as steam begins to form, you should ___________./close the air cock

In a coil-type forced circulation auxiliary water-tube  boiler _____________./hot water flashes to steam in the flash chamber

If poor combustion occurs in an auxiliary boiler due to an air damper linkage being out of adjustment, you would adjust the linkage and then _____________./check the photocell window for carbon deposits

Which of the automatic boiler controls listed should be  tested prior to lighting off an auxiliary boiler?/Low water level cutoff switch

Which of the following conditions would cause "panting" in a steaming auxiliary boiler?/Insufficient combustion air

Which of the following statements concerning the operation of a coil-type forced circulation auxiliary water-tube  boiler is correct?/Unevaporated boiler water collects in the bottom of the  accumulator.

Coast Guard Regulations (46 CFR) require electric hot water supply boilers to be provided with a/an _____________./temperature limiting device

In a forced circulation auxiliary boiler, steam is formed in the ____________./steam accumulator (flash chamber)

Ignition failure in an automatically controlled auxiliary boiler can be caused by ______________./carbon deposits on the electrode

A sudden flame failure in an operating auxiliary boiler, equipped with an automatic combustion control system and burning light fuel, could be attributed to a______________./loose connection on the photocell

The flame safeguard controls of a large automatically fired auxiliary boiler, may consist of a ____________./photoelectric cell

Coast Guard Regulations (46 CFR) permit the use of which of the following fuel oil ignition methods on automatic  auxiliary boilers?/Light oil pilot

Which of the following statements concerning fire-tube  boilers is correct?/Combustion gases flow through the tubes.

Which of the following statements about a coil-type forced circulation auxiliary water-tube boiler is correct?/Response to steam demand is comparatively rapid.

Ignition failure in an auxiliary boiler can be caused by _____________./carbon deposits on electrodes

The purpose of the safety relief valves installed on an  auxiliary boiler is to ____________./reduce excess steam pressure in the boiler

The safety valve installed on a coil-type auxiliary boiler is located on the ____________./flash chamber

Which of the following statements is true concerning  pressure limit switches and pressuretrols installed on  auxiliary boilers?/They consist of a bellows assembly, linked with a snap  action switch, through a pressure adjusting mechanism.

The purpose of try-cocks used on an auxiliary boiler is to ____________./provide an alternate means of determining the water level, if the gage glass fails

The gage glass on a coil-type auxiliary boiler is connected to the ______________./accumulator

When the steam pressure drops below a set value on an  automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will _________./increase the fuel oil control valve opening

Automatically fired auxiliary boilers use fuel oil strainer arrangements of either the simplex type or _____________./duplex type

In an auxiliary boiler steam and water system, the highest pressure will be in the ____________./feedwater system

The fuel oil strainers in the fuel oil service system of an automatically fired auxiliary boiler are permitted by the Coast Guard Regulations (46 CFR) to be either the simplex type or the ____________./duplex type

The principal purpose of refractory and insulation   installed in the firebox of an auxiliary boiler is to  ____________./protect the inner casing and reduce heat loss

Fins are installed on the fireside of the water-tubes, used in waste heat boilers, to ____________./increase the heat transfer surface area

Auxiliary boilers can be classified as ________________./all of the above

Fins are installed on the fireside of the water-tubes used in waste heat boilers to ____________./increase the rate of heat transfer

The rate of heat transfer in a water-tube auxiliary boiler can be increased by ____________./installing fins on the firesides of water-tubes

Large steam drums are not required in the design of a  coil-type auxiliary water-tube boiler because _____________./steam and water are separated in the accumulator   (flash chamber)

Before any work is done on a burner in an automatically  fired auxiliary boiler, you should always ___________./close all manually operated fuel valves

Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are _____________./cycled on and off in response to steam demand

The fuel oil strainers located in the fuel oil service  system of an automatic auxiliary heating boiler are either the duplex type or the _______________./simplex type

Auxiliary boilers are divided into several classifications, one of which is ______________./water-tube forced circulation

Downcomers installed on auxiliary package boilers are  protected from direct contact with hot gases by ___________./refractory and insulation

Which of the listed problems will happen when the water  level of a fire-tube type auxiliary boiler approaches the crown sheet?/The fusible plugs will melt.

A waterside fusible plug, installed in a fire-tube auxiliary boiler _____________./by design, is drilled with a tapered hole so that boiler water pressure holds the fusible metal in the bronze body

A horizontal fire-tube package boiler, incorporating a  two-pass design, is basically constructed with ____________./removable spiral metal gas retarders being inserted in the tubes to decrease the gas velocity to a minimum, thus  extracting the maximum caloric heat value

The fusible plugs used in fire-tube auxiliary boilers are installed in the _____________./crown sheet

Waste heat boilers may be equipped with vents on the feed water heater heads to ____________./prevent air binding

The tube sheets installed in a fire-tube auxiliary boiler are normally connected by ____________./fire-tubes and stay-tubes

In a coil-type forced circulation auxiliary water-tube  boiler, ____________./steam demand response is comparatively rapid

Which type of pump is typically used to supply fuel to a unit type auxiliary boiler?/Rotary

According to Coast Guard Regulations (46 CFR), the maximum allowable boiler pressure in which a tubular gage glass may be installed is _________./250 psig

A distorted furnace in a fire-tube auxiliary boiler may be the result of ____________./overheating, due to waterside deposits

The principal purpose of refractory and insulation   installed in the firebox of an auxiliary boiler is to  ____________./protect the inner casing and reduce heat loss

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?/To ensure that the valve will not be seized shut when hot.

According to Coast Guard Regulations (46 CFR), the highest boiler pressure where a tubular type gage glass may be installed is ______________./250 psig

Before any work is to be carried out on a burner in an  automatically fired auxiliary boiler, you should always  _____________./close all manually operated fuel valves

During unsafe firing conditions in a large automatic  auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as   ____________./limit controls

When checking for the presence of sulfite in the feedwater of an auxiliary boiler, you are in essence checking   ____________./to ensure the compound additions are adequate for   controlling dissolved oxygen

Coast Guard Regulations (46 CFR) permit the use of which of the listed fuel oil ignition methods on an automatically fired auxiliary boiler?/A high energy electric spark

To test the operation of the flame failure switch of an  operating automatically fired auxiliary boiler, you should _____________./close the manual fuel valve with the burner firing

On auxiliary boilers using individual flame scanners to  monitor the main and pilot flames, the main flame scanner should be sighted to ______________./avoid detecting the pilot flame

BEARINGS            print

QUESTION /CORRECT ANSWER

Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the  bearing housing or caps. The installation process of these bearings requires sufficient ________./crush

Bearing wear on a split sleeve type bearing is measured with a ____________./ball anvil micrometer

The amount of wear on a split precision main bearing can be accurately determined by comparing the data from a previous reading to the present readings taken with a ____________./ball anvil outside micrometer

The amount of wear on a split, fixed sleeve-type, main  diesel bearing can be accurately determined with a ________./ball anvil outside micrometer

Which of the bearings listed are most widely used for the main and connecting rod bearings of a diesel engine?/Precision insert

Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?/Pressure lubrication

Which of the following is an example of a solid bearing?/Piston pin bushing

In a diesel engine, the main bearings are used between the _____________./crankshaft and the engine block

Which of the listed bearing installations is subjected to swinging motion?/Wrist pin bearings

Bearing "crush" as applied to diesel engine main bearings, will result in _____________.  ( the common word used is "nip" )/positive seating of the bearings in their housings

A main propulsion diesel engine crankshaft bearing lacking sufficient "crush", will _____________./tend to rotate with the journal

Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?/Precision insert

Diesel engine main and connecting rod precision bearings are made in halves. Each half exceeds one-half the   bearing circumference by a small amount. The small   amount is termed _____________./crush

The proper location for journal bearing oil grooves is  _______________./as a side relief where the two shells meet

A characteristic of a bearing material which permits small dirt particles to become embedded in it's surface is  ________________./desirable, as it will prevent damage to the journal surface

Which bearing half will receive the greatest load in a  two-stroke/cycle diesel engine?/Lower half of the piston pin bearing in the connecting rod.

Which of the statements represents a characteristic of the thrust collar in a Kingsbury thrust bearing?/It turns with the shaft and the pivot shoes do not rotate.

The leveling plates in a Kingsbury thrust bearing are held in position by _____________./dowels and pins

The bearings used to support the crankshaft are generally called __________./main bearings

The nuts of main bearings, connecting rod bolts and all  other moving parts are to be secured by ________./split pins or other effective means

On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by ____________./pressure feed

Proper lubrication of the main bearings is more easily  obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine  because ____________./bearing pressure in a four-stroke/cycle single acting diesel engine is continually reversed

Lubricating oil is supplied to the crankpin bearings in a marine diesel engine by _____________./internal crankshaft passages

On a medium-speed main propulsion diesel engine, the  crankpin or crank journal bearings receive lubricating oil from _____________./drilled passages in the crankshaft

Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?/Pressure

Wristpin bearings are difficult to lubricate because of  their oscillating motion and _____________./their position in the lubrication system

While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface. You would, therefore, suspect that ___________./the lube oil was not being properly filtered

The most crucial time for any bearing with regards to  lubrication is _____________./during starting

To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the ___________./bearing lube oil temperature

The load is always placed on the lower half of the main  bearings in a/an ____________./two-stroke/cycle engine

Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?/Full floating

A thrust bearing is used with a propulsion diesel engine to _____________./control axial movement of the crankshaft

What is the function of the main thrust bearing?/Transmits propeller thrust to the hull.

Kingsbury thrust bearings are lubricated by _____________./flooding the thrust bearing assembly with oil

Which of the bearing types listed is most commonly used in smaller vessel main propulsion reduction gears as thrust bearings?/Tapered roller bearings

In a Kingsbury thrust bearing, the thrust shoes are _______./pivoted, and the thrust collar turns with the shaft

Which of the listed components will ensure equal continuous pressure on the thrust shoes of a Kingsbury thrust bearing?/Leveling plates

The highest loads applied to the diesel engine crankshaft main bearings are ____________./firing loads

A well-lubricated bearing surface always appears __________./highly polished

In some modern large diesel engines, which of the followingis used as the support for the main bearings?/Bedplate

An acceptable means of tightening connecting rod and mainbearing cap bolts is to measure the ___________.  I. torque applied to each nut and bolt assembly  II. stretch of each nut before and after tightening/I only

Kingsbury thrust bearings are lubricated by _____________.                  I. a flooded housing  II. oil spray on collar and shoes/I only

Which of the listed bearing types is an example of a solid bearing?/Piston wrist pin bushing

The upper leveling plates in a Kingsbury thrust bearing are held in place by _____________./pins through the base ring

Which of the following statements represents the proper  order of thrust transmission when a Kingsbury thrust bearing is used with diesel propulsion?/Propeller shaft, thrust collar, thrust shoes, and thrust bearing housing

To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the ___________./bearing lube oil temperature

The thickness of the oil film to be developed in a diesel engine main bearing, depends upon the _____________./all of the above

Proper lubrication of the main bearings is more easily  obtained in a single acting, four-stroke/cycle diesel engine than in a two-stroke/cycle diesel engine because __________./the direction of pressure on the journals in four-stroke engines is continuously reversing, whereas in two-stroke engines it is constant

To measure bearing clearances, a special small diameter  plastic rod (plasti-gage) is placed between the crankshaft journal and the connecting rod bearing shell. The actual reading is obtained by _____________./using the paper or cardboard gauge printed on the plastic rod package to measure the flattened width

To determine the main bearing clearance of a propulsion  diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the  crankshaft journal using a/an _____________./outside micrometer

On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an ______./bridge gage

Which of the devices is commonly used in measuring the  clearances between the main engine bearings and the   crankshaft?/Plasti-gage

To determine the main bearing clearances in a diesel engine, you should use _____________./plasti-gage

The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in __________./increased compression ratio

Which of the following operating conditions can occur when shims are removed from the joint between the foot of a  marine type diesel engine connecting rod and the bearing box?/Decreased compression ratio

Worn main bearings will cause the compression ratio of an auxiliary diesel engine to _____________./decrease

An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a _____________./torque wrench

Abnormal crankpin bearing and piston skirt surface wear  indicate _____________./incorrect connecting rod alignment

Small cracks in the crankshaft bearing surface of a diesel engine are an indication of _____________./fatigue failure

Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed diesel engine?/Precision insert

Which of the bearing types listed is commonly used for main bearings in small internal combustion engines?/Replaceable precision-type

Bearing clearances in small high-speed diesel engines should be measured with _____________./plasti-gage

Which type of wrist pin uses bearings in the piston bosses, but is fixed to the small end of the connecting rod?/Semi-floating

Worn main bearings in a diesel engine can result in _______./decreased compression pressure

You are inspecting the lower main precision bearings on a diesel engine. You observe that about half the thin babbitt linings are of a milky white color. This condition is caused by _____________./water contamination of the lube oil

Bearing clearances in small high-speed diesel engines should be measured using _____________./plasti-gage

A bronze bearing liner with a lead-tin flashing has a  milky-white color over most of its surface and some areas of exposed bronze. The white coloring indicates _____________./water contamination of the lube oil system

DIESEL ENGINE COMBUSTION AND FUEL             print

question/ CORRECT ANSWER

The light and medium fuels utilized in internal combustion engines provide a source of ________./food for microbiological organisms

What is to be installed on an internal combustion engine if its cylinder bore exceeds eight inches?/Explosion relief valves

Which statement regarding the arrangement and location of explosion relief valves used on an internal combustion  engines is true_____________?/Minimizing the danger from emission of flame is a key  consideration

Which of the following listed construction details of  internal combustion engines is required?/A warning notice to caution against the opening of a hot crankcase for a specified period of time after shut down.

At what pressure should a cylinder relief valve of an  internal combustion engine be set to relieve?/The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure.

Successful combustion inside the cylinders of a diesel  engine is dependent upon _____________./all of the above

Which of the combustion parameters listed is used in a  diesel engine, but NOT related to the injection system?/Effective stroke

Precombustion chambers, air cells, and energy cells in high- speed, small bore diesel engines all serve to increase  _____________./turbulence

Which statement about diesel engine combustion is true?/Maximum cylinder firing pressure is not developed   until the piston passes TDC.

Proper atomization of fuel in diesel engine combustion  chambers will _____________./improve combustion

The ability of a fuel particle to travel into the combustion chamber before burning is called _____________./penetration

Theoretical perfect combustion in a diesel engine yields by-products of _____________./water vapor and carbon dioxide

What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?/Atomizing

Turbulence in a diesel engine cylinder is of major   importance in providing _____________./complete fuel/air mixing

Poor combustion in a diesel engine can be caused by   ______________./low intake air temperature

Which of the following conditions will tend to increase the ignition delay period of combustion in a compression  ignition engine?/Decreasing the air charge temperature.

Combustion gas venting through the expansion tank can be caused by a _____________./cracked cylinder head

Combustion knock can occur in the cylinders of a diesel  engine under any condition permitting _____________./excess fuel in the combustion chamber

Turbulence of the compressed air charge in a diesel engine cylinder increases _____________./the efficiency of the engine

Combustion knock occurring in a diesel engine can be caused by _____________./prolonged ignition lag

Which of the following statements is a description of the combustion cycle?/The heat process which produces the force to initiate the movement of the engine parts.

An exhaust pipe from a internal combustion engine may not need to be insulated when _________./it is of the water jacketed type

Combustion knock occurring in a diesel engine can be caused by ________________./low coolant temperature

In a diesel engine, the time taken to heat the fuel   particles, turn them into vapor, and bring about combustion is called _____________./ignition delay

Diesel engines are classified as reciprocating internal  combustion engines because they ______________./burn fuel in a chamber where its energy moves a piston back and forth

The thermal energy produced by an internal combustion engine is transformed into ______________./mechanical energy

Which of the listed designs is effectively used to provide the turbulence necessary for proper combustion in a diesel engine cylinder?/Precombustion chamber

Which of the following statements represents the advantage of a precombustion chamber used in an auxiliary diesel  engine?/Timing of injection does not need to be exact.

One advantage obtained from the use of a precombustion  chamber in a diesel engine is _____________./smoother combustion

Precombustion chambers differ from turbulence chambers in that precombustion chambers _____________./contain a smaller portion of the total clearance volume

What is commonly used to create turbulence in a diesel engine combustion system?/Shape of the piston crowns.

Turbulence is created in the cylinders of a diesel engine to _____________./help mix fuel and air

The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the _____________./method of igniting fuel

What determines the number of events occurring in a cycle of operation in an internal combustion engine?/Type of engine (diesel or gasoline)

Which of the following statements describes the operating characteristics of a precombustion chamber?/When fuel oil is injected into the precombustion chamber, it does not need to be as finely atomized as the fuel oil in diesel engines having direct injection.

Modern marine diesel engines using mechanical fuel   injection, operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is _________./a combination of constant volume and constant pressure

A multi-orifice fuel injection nozzle is usually used with which of the listed types of combustion chamber?/Open combustion chamber

Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by  _____________./clogged air intake passages

In a modern internal combustion diesel engine, the load  carrying part of the engine is referred to as the _________./bedplate or base

According to U. S. Coast Guard Regulations (46 CFR),  internal combustion engine driven emergency generators shall be operated under load for at least two hours at least once ____________./a month

According to Coast Guard Regulations (46 CFR), how often shall internal combustion engine driven emergency generators be operated under load?/Once a month for two hours

Which of the following conditions is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?/Pyrometer responses will be retarded.

In a diesel engine, what is the advantage of precombustionchambers over the open type of combustion chamber? I. Precombustion chambers permit coarser fuel  atomization. II. Precombustion chambers allow lower fuel injection  pressure./both I and II

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

Which internal combustion engine starting system uses avane type fluid motor?/Compressed air

Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?/Higher compression ratios create higher temperature.

Diesel engine blow-by is the leakage of combustion gases past the _____________./compression and scraper rings

In accordance with Coast Guard Regulations (46 CFR)   regarding internal combustion engine exhaust manifold  installations, which of the following statements is true?/They may be water-jacketed and cooled by the discharge from a pump which operates only when the engine is running.

Open combustion chambers are designed to _____________./provide proper fuel/air mixing

The primary purpose of the open combustion chamber used in diesel engines is to _____________./provide a place for combustion

Turbulence in the combustion chamber of a diesel engine can be induced by _____________./directional intake ports

The greatest turbulence in a diesel engine cylinder is  created by the _____________./shape of the combustion chamber

Combustion knock will most likely occur as a result of using a fuel with _____________./low ignition quality

Coast Guard Regulations (46 CFR) require a trial for  ignition period must not exceed ____________./15 seconds

The air supplied to a diesel engine is compressed to___________.I. provide heat for the ignition of the fuelII. decrease injection delay/I only is correct

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?/An increase in compression ratio will decrease the ignition lag.

The longer the ignition delay period occurs in a diesel  engine, the _____________./more rapid will be the rise in combustion pressure

Which of the following conditions will tend to increase the ignition delay period of combustion in a compression  ignition engine?/Decreasing the air charge temperature.

The rate of pressure rise during the period following fuel ignition process in a diesel engine, is influenced chiefly by the ____________./length of the ignition delay period

Which of the following statements concerning the factors affecting ignition delay is correct?/An increase in coolant temperature will decrease ignition delay.

The time between injection and ignition of the fuel is known as _____________./ignition delay

The minimum speed an engine must attain before ignition can occur depends upon __________./all of the above

In a diesel engine, the time period between fuel injection and ignition is usually defined as _____________./ignition delay

The theoretical minimum compression ratio necessary to  ensure compression ignition in a direct injection diesel engine is _____________./0.50069444

In an operating diesel engine, preignition can be caused by _____________./oil in the air charge

The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period due to the ______./turbulence of the air change

The ignition quality of diesel fuel becomes less critical as ______________./engine speeds decrease

One cause of diesel engine fuel ignition delay is _______./ignition quality of the fuel oil

If fuel injection in a diesel engine begins earlier than the design start of injection, ignition may be delayed because the _____________./cylinder compression pressure may not be high enough

In diesel engineering practice, the term used to express the ignition quality of a particular fuel is _____________./cetane number

The ignition quality of diesel fuel is indicated by its  ______________./cetane number

The ignition quality of diesel fuel oil is indicated by the ______________./cetane number

The ignition quality of a diesel fuel is indicated by the _____________./cetane number

The ignition quality of a fuel oil is an important   operational consideration because it _____________./affects the starting ability of a cold engine

The longer the ignition delay period resulting from improper use of low cetane fuel, the ____________./more rapid the rise in combustion pressure

A mixture of 45% cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil. The sample can be described as having a/an __________./cetane number of 45

When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as ______________./engine speeds decrease

Most practical diesel engines today operate on a cycle which is a combination of the Diesel and Otto cycles. In this process, compression ignition _____________./begins on a constant volume basis

A diesel engine is turned at normal cranking speed and no ignition occurs. This could be the result of _____________./air bubbles in the fuel oil system

The amount of oil consumed by a return flow-type fuel  atomization system, fitted with both supply and return  meters, can be determined by the ____________./difference between the supply and return meter readings

A sprayer plate used in a return flow fuel oil atomizer is correctly installed if the oil __________./passes through the tangential slots before passing through the whirling chamber

The amount of fuel oil atomized by a return flow oil burner is directly controlled by the ____________./fuel oil back pressure

In comparison to straight flow mechanical atomizers, return flow atomizers provide relatively uniform atomization over a wide firing range due to the ____________./oil supply pressure not having to be reduced at low loads to the point where poor atomization occurs

Fuel droplets injected into a diesel engine cylinder must have adequate penetration to _____________./thoroughly utilize the air charge

Fuel injection systems meter fuel, atomize fuel, and  _____________./inject fuel at the proper time

A variable capacity, pressure atomizing, fuel oil burner functions to ____________./provide a wide range of combustion

The firing range of a variable capacity, return flow-type fuel atomizer is regulated to meet steam demand by varying the ____________./fuel oil return pressure

Fuel oil penetration into the cylinder of a diesel engine is _____________./reduced by finer atomization

Proper atomization of fuel in diesel engine combustion  chambers will _____________./improve combustion

A change in the degree of fuel atomization in a diesel  engine would most greatly affect _____________./fuel penetration

Fuel oil discharged to the diesel engine cylinder is  atomized at the _____________./injector nozzle tip

A change in the degree of fuel atomization in a diesel  engine cylinder has the greatest effect on the ____________./combustion in that cylinder

In a diesel engine, what is the advantage of precombustion chambers over the open type of combustion chamber? I. Precombustion chambers permit coarser fuel  atomization. II. Precombustion chambers allow lower fuel injection  pressure./both I and II

A change in the degree of fuel atomization in a diesel  engine greatly affects the _______________./fuel penetration

Which of the following statements concerning fuel   atomization in a diesel engine cylinder is correct?/The greater the atomization, the lesser the penetration.

question/CORRECT ANSWER         print

Why is it necessary to compress the air charge in the  cylinders of a diesel engine?/To ignite the fuel.

Turbulence of the compressed air charge in a diesel engine cylinder increases _____________./the efficiency of the engine

A sudden drop in diesel engine cylinder compression pressure can be caused by ____________./malfunctioning valves

Which of the listed reasons is the most likely cause of a sudden drop in compression pressure in one diesel engine cylinder?/Malfunctioning valves

The compression ratio of a diesel engine refers to the ratio between the _______________./cylinder volumes at top dead center and at bottom dead  center

The purpose of compressing the air within the cylinder of a diesel engine is to __________./produce the heat for ignition

If the compression ratio is increased on any diesel engine, _____________./thermal efficiency will increase

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in ____________./increased horsepower

In an operating diesel engine, the sealing of the cylinder is the result of the compression rings being forced against the cylinder walls by _____________./combustion gas pressure acting behind the ring

A diesel engine valve spring is under compression when the valve is _________.  I. open  II. closed/both I and II

In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to  ______________./ignite the fuel

The compression of air in a positive displacement rotary supercharging blower, occurs only _____________./as air moves into the discharge passage

A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates _____________./properly functioning rings

The face surface appearance of a shallow groove, stainless steel, chrome plated compression ring should exhibit through its operating life a ____________./smooth, shallow groved, chrome surface

A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by _____________./malfunctioning valves

Low compression in a diesel engine could be caused by  ________________./worn or broken piston rings

Low compression pressure in a diesel engine can be caused by _____________./improperly seating intake valves

Low compression pressure in a diesel engine is caused by ___________./improperly seated valves

Low compression pressure in a diesel engine can be caused by ______________./a leaking cylinder head gasket

Low compression pressure in a diesel engine may be the  result of ______________./excessive mechanical clearance between the piston crown and cylinder head

Which of the listed problems can be a cause of low   compression pressure in a diesel engine?/All of the above

A drop in compression pressure in one cylinder of a diesel engine can be caused by _____________./burned valves

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?/Compression must be low to prevent preignition.

When a diesel engine compression pressure is checked, the indicator is connected to the _____________./cylinder indicator cock

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by  _____________./excessive cylinder cooling

MOTOR COOLING SYSTEMS   print

question/CORRECT ANSWER

Cooling water pumps driven by direct reversing diesel  engines are usually of the straight impeller vane type pump with a concentric housing to ____________./provide cooling water flow when the engine is running either ahead or astern

The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ___________./allow for an increase in water volume as the engine warms up

Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?/All of the above.

The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the _____________./fresh water expansion tank

The highest pressure in any closed diesel engine freshwater cooling system is at the _____________./cooling water pump outlet

In any diesel engine closed freshwater cooling system, the lowest pressure exists at the _____________./expansion tank atmospheric vent

Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ________________./formation of excessive quantities of condensate

The outlet from an expansion tank of a closed freshwater cooling system should be piped to the ____________./jacket water pump suction line

The expansion tank in a diesel engine closed freshwater  cooling system is located at _____________./the highest point in the system

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water _____________./around the cooler

In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is  controlled by the _____________./thermostatic bypass valve

Temperature control valves installed in the jacket cooling water system of a diesel engine, modulates the rate of water flow through the __________./heat exchanger

The jacket water temperature in a diesel engine closed  freshwater cooling system is normally controlled by   _____________./the operation of the thermostatic valve

Why do most temperature control valves in diesel engine  closed freshwater cooling systems vary the flow of jacket water through the cooler instead of through the engine?/Changing the rate of flow in the jackets could cause  localized hot spots.

How much will the jacket water temperature normallyincrease between the inlet and outlet of medium orhigh-speed diesel engines?/10° to 20°F

Using a cooling water temperature of 225°F (107.2°C),  instead of 180°F (82.2°C) in an auxiliary diesel engine, will ______________./reduce the opportunity for the formation of sulfuric acid in the cylinder bore exhaust passages

Operating a diesel engine for prolonged periods, with a  closed freshwater cooling system, at temperatures lower than the normal design temperature can cause _____________./the formation of sulfuric acid

As a general rule, the recommended operating water jacket outlet temperature range for medium and high speed marine diesels with closed cooling systems is ______________./180° to 199°F

A closed freshwater cooling system is commonly used with marine diesel engines because the _____________./jacket water temperature is more easily controlled

In a diesel engine closed freshwater cooling system where the cooling water pressure drop through the engine is 10 psig, and the pressure drop through the heat exchanger is 4 psig. The cooling water pump must produce a discharge head of at least _________/15 psig

In a diesel engine closed freshwater cooling system   employing a radiator, proper water temperature can be  obtained by _____________./adjusting the radiator louvers

Which of the listed effects would the film of alkaline  chromate have on the metal surfaces of the cooling systemof a diesel engine?/Protects metallic surfaces from corrosion

Ethylene glycol, when used as a coolant in a closed cooling system for a diesel engine, is more advantageous than  untreated raw water because it _____________./has a lower freezing point and higher boiling point

A diesel engine cooling water system with a pH factor of 3.0 indicates a condition of ____________./excessive acidity

In a diesel engine cooling water system, a pH of 6.0  indicates a/an ______________./slightly acidic condition

The pH value of water in a diesel engine closed cooling  water system should be maintained between _____________./8.0 to 9.5

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the __________. I. mep is lower and the scavenging air is cooling the  exhaust gases II. valve overlap in a four stroke diesel e/I only is correct

The temperature at which an adjustable bellows type  thermostat valve is set by ______./changing spring compression to oppose the bellows

High diesel engine cooling water temperatures can be caused by _____________./all of the above

High diesel engine cooling water temperatures can be caused by _____________./air in the cooling system

Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an  __________./clogged sea suction strainer

Which of the following problems will cause above normal  cooling water temperatures in a diesel engine using a closed freshwater cooling system?/Eroded baffle in the cooler

If the jacket water temperature of an operating diesel  engine suddenly rises above normal, the cause can be  attributed to _____________./a clogged raw water sea suction

If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is _____________./an excessive accumulation of scale in the heat exchanger

Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water temperature from all cylinders begins to rise above normal, you should suspect _____________./overloading in all cylinders

You are operating a main propulsion diesel engine at a  constant load when the jacket water temperature begins to rise. This could be caused by ____________./a piston about to seize

Immediately after starting a diesel engine, normal raw waterand jacket water pressures are indicated. However, thejacket water temperature continues to rise. If there is nochange in the sea temperature, you should suspect _________./a jammed three-way thermostatic valve

The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normal. Which of the  following problems is most likely the cause?/Faulty thermostatic bypass valve.

Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water temperature from an individual cylinder begins to  rise, you should suspect _____________./overloading of that cylinder

One result of operating a diesel engine at light load with excessively low cooling water temperatures is a/an _______./increase in cylinder misfiring

If the jacket water temperature in an auxiliary diesel  engine cooling system is lower than normal, the probable cause is _________./faulty operation of the thermostat

Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating  temperatures can _____________./cause sulfuric acid formation

A faulty thermostatic bypass valve, in a diesel engine  cooling system, can result in _____________./excessive time required for warming-up

An emergency diesel generator cooling system is equipped with an automotive type thermostat. If the thermostat  bellows loses its charge, the thermostat will _____________./close, and the engine coolant temperature will increase

Cooling water pumps driven by direct-reversing diesel  engines are usually ____________./straight impeller vane with concentric housing

If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may  result in ______________./improper temperatures

Which of the following conditions will develop if the flow of "raw" cooling water to a diesel engine is obstructed?/The jacket water temperature will rise.

Diesel engine exhaust gas temperatures can be used to  determine individual cylinder _____________./performance

All of the diesel engine cylinder firing pressures are  normal, yet all of the exhaust temperatures are low. Which of the following situations is responsible for this   condition?/Light load

Which of the following factors tends to increase scale  formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?/Operating the engine while maintaining a high sea water  outlet temperature.

Diesel engine exhaust temperatures may be used to indicate _____________./all of the above

Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the  waterside of the _____________./engine cylinder liners

High firing pressures and a low exhaust temperature in a diesel engine may result from _____________./early fuel injection timing

If the raw water supply pressure for a diesel engine cooling system is below normal, you should check for a ____________./clogged sea strainer

In a closed cooling water system, which of the following problems can cause the water pressure to fluctuate?/Air entrained in the cooling water.

High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _____________./engine overload

Which of the following problems can cause fluctuating  pressures in the closed cooling system of a main propulsiondiesel engine?/Cavitation in the cooling water pump.

Which of the following statements is correct concerning  diesel engine cooling water systems?/At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat  exchangers.

Maintaining the proper fuel oil temperature will result in _____________./improved atomization

To successfully reduce an excessively high diesel engine exhaust gas temperature, you should _____________./reduce the load on the engine

Which of the following statements is correct for the design and installation of diesel engine cooling water systems?/Drain cocks are to be provided at the lowest points of all cylinder water jackets.

Coolant can be lost from a diesel engine jacket cooling  water system by leakage from _____________./all of the above

Failure to ensure proper venting of the cooling system of a diesel engine can result in ____________./local overheating and/or internal corrosion

The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is _________________./normal for these conditions

If a diesel engine's exhaust temperature is abnormally high, the cause could be ____________./overloading of the engine

If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should  suspect a _____________./leak in the primary cooling system

Which of the following conditions can cause oil to   accumulate in the cooling system of a diesel engine?/Defective oil cooler core.

A diesel engine is operating with excessively high exhaust temperatures at all cylinders. To correct this condition, you should FIRST _____________./reduce the engine load

One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to ____________./adjust the fuel rack

If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should  suspect that the _____________./compression pressures are below normal

How are the pressure and temperature affected in a diesel engine cylinder during compression?/Pressure and temperature increase

A diesel engine is operating under a normal load with low firing pressures and high exhaust temperatures. The most probable cause of this condition is ________________./a restricted exhaust manifold

If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST __________./reduce engine load

A 16 cylinder main propulsion diesel engine is operating at 90% of full load. All cylinder exhaust temperatures are indicated at 950°F, except the No. 7 cylinder which is  indicated at 1100°F. All fuel racks are at 21-22 mm except No. 7 which is at 16mm. /Replace and retime No. 7 cylinder fuel pump.

In a diesel engine cooling system, the high temperaturealarm contact maker will be activated on excessively highwater discharge temperature from the ____________./engine jacket water outlet

Cooling water pumps driven by direct reversing diesel  engines are usually of the straight impeller vane type pump with a concentric housing to ____________./facilltiate bi-directional operation

In a diesel engine jacket water cooler, with seawater  cooling the fresh water, the ___________./jacket water pressure should always be greater than the sea water pressure

If an auxiliary diesel engine coolant temperature is higherthan normal, but the thermostat is determined not to be defective, you would suspect a/an ___________./dirty jacket water cooler

When one cylinder has a lower compression pressure and  higher exhaust gas temperature than any of the other enginecylinders, which of the conditions listed will beindicated?/Leaky exhaust valve

If the firing pressures in a diesel engine are high,  although the exhaust temperatures are normal, the cause may be _____________./worn orifices in the injection nozzles

Cooling water pumps driven by direct reversing diesel  engines are usually of the straight impeller vane type pump with a concentric housing to ____________./to turn in either direction

The device most commonly used to measure exhaust gas temperature of cyclinders is a _____________./pyrometer

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a _____________./pyrometer

High cylinder firing pressure, accompanied by low exhaust temperature, can result from _____________./excessively early injection timing

Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?/Excessively early injection timing.

When high firing pressures and low exhaust temperatures  occur simultaneously in a diesel engine, this may be a  result of ____________./early timing of fuel injection

Operating a diesel engine under light loads and at low  temperatures for an extended period can result in _________./formation of carbon on the intake and exhaust ports

When starting a diesel engine at temperatures below 70°F, the frictional resistance to turning will be _____________./proportional to the lube oil viscosity

Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?/Higher compression ratios create higher temperature.

The diesel engine starter least likely to be affected by low ambient temperatures, is the _____________./hydraulic starting system

A pyrometer is an instrument used to measure the temperature of the diesel engine _____________./exhaust

Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the ________./exhaust gases at various locations

When the cold valve lash is less than that specified by the manufacturer, diesel engine valves, operating at normal  temperatures, will ______________./close later than normal

Low cylinder compression pressure and a high exhaust  temperature may indicate ______________./leaking valves

In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in ____________./sulfuric acid corrosion

One of the purposes for water cooling the exhaust manifold in marine diesel engine is to __________./reduce excessive heating of engine room

If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST __________./reduce engine load

In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an _____________./four-stroke/cycle engine

You are operating a 16-cylinder diesel engine at 75% load, turning 900 RPM. All exhaust temperatures are between 900°F and 950°F, except the #3 cylinder, with an indicated reading of 750°F. All fuel rack settings are between 21 and 22 millimeters, with th/Increase the #3 rack setting and watch the exhaust   temperature.

CRANKSHAFT AND CAMSHAFT

QUESTION/CORRECT ANSWER        print

The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to  rotate at _____________./crankshaft speed in a two-stroke cycle diesel engine

Camshafts are usually driven by timing gears or ___________./chain drives

Additional explosion relief valves are fitted on separate spaces of the crankcase such as gear or chain cases for  camshaft or similar drives when the __________./gross volume of such spaces exceeds 21 cubic feet

Additional explosion relief valves are fitted on separate spaces of the crankcase, such as gear or chain cases for camshaft or similar drives, when the _______./gross volume of such space exceeds 0.6 cubic meter

The valve cam slope angle determines the _____________./acceleration rate of valve opening and closing

The shape of a diesel engine cam determines the ___________./all of the above

The valve cam slope angle determines the _____________./opening and closing rate of the valve

The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of  operating conditions?/Firing order, valve timing, and valve lift

When two cams of the same diameter, one with tangential flanks and the other with convex flanks are compared, the cam with tangential flanks will cause___________./more abrupt valve action

When a hydraulic valve lifter is on the base circle of the cam, "zero" valve lash is maintained by the ______________./plunger spring

In a diesel engine, with the valves set to specification, the shape of the cam determines the valve _____________./all of the above

The shape of a cam on a diesel engine determines the valve's __________./All of the above are correct.

On a large diesel engine installation, crankshaft axial  alignment is maintained by the ______________./engine thrust bearing

The main reason counterweights are added to crankshafts is to _____________./provide uniform loading and wear of main bearings

A crankshaft whose center of gravity coincides with its  center line is said to be __________./statically balanced

The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed _____________./rate of injection

The governor controlling a diesel engine modulates   crankshaft RPM by adjusting the _____________./fuel injection pumps

The most important factor in engine performance is the  actual power output at the end of the crankshaft available for doing work. This is known as _____________./brake horsepower

A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a  ____________./medium-speed diesel

A crankshaft whose center of gravity coincides with its center line is said to be __________.   I. staticly balanced       II. dynamically balanced/I only

Which instrument is used to take crankshaft deflection  readings?/Strain gage

Which instrument is used to take crankshaft deflection  readings?/Strain gage

Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by  rotational and reciprocating forces?/Torsional vibration damper

Between the periods of injection and ignition of the fuel, a diesel engine crankshaft rotates through the ____________./delay period

Diesel engine crankshaft deflection readings are generally taken at four crank positions. Good engineering practice requires the deflection gage or indicator to be ___________./left in place for all four readings

One method of determining crankshaft misalignment is by  ______________./taking micrometer readings between the crank cheeks opposite the crankpin every 90° of crank angle rotation

Which instrument is used to take crankshaft deflection  readings?/Strain gage

CRANK CASE

question/Correct Answer        print

Regarding a Diesel engine crankcase, the gener alarrangement and installation should preclude the possibility of ________./free entry of air to the crankcase

A diesel engine crankcase ventilation system ______________./removes combustible gases

Internal combustion engine crankcase vent outlets must be equipped with ______./corrosion resistant flame screens

What function is provided by the crankcase ventilation  system on some diesel engines?/Prevents the accumulation of combustible gases.

The crankcases of many diesel engines are kept under a slight vacuum to _____________./reduce the risk of explosion

The crankcase of many diesel engines are kept under a slight vacuum by the ______________./crankcase exhaust fan

When may the crankcase ventilation pipes or oil drain pipes of two or more engines be connected?/No interconnection may be made between the crankcase  ventilation pipes or oil drain pipes.

Crankcase explosion relief valves should be of the ________./return seating type

Explosion relief valves on diesel engine crankcases should relieve the pressure at not more than _________./0.2 bar

How many crankcase relief valves are required for a 13  inch bore, eight cylinder in-line engine?/8

With regards to a diesel engine crankcase explosion, the most violent is the _____________.  I. primary explosion  II. secondary explosion/II only

Which of the listed problems would be indicated by an  accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?/Cracked cylinder liner.

The direct cause of a crankcase explosion can be attributed to ______________./an overheated bearing

The possibility of a diesel engine crankcase explosion will be increased by operating an engine ____________./with a leaking crankcase inspection cover gasket

Which of the following problems could develop due to the accumulation of oil vapors in the crankcase of a diesel  engine?/Crankcase explosion

When oil vapor, oxygen and hot spots are present at the same time within a crankcase, which of the following hazards could develop?/Explosion

Which of the listed conditions is most likely to cause a crankcase explosion?/Fuel dilution of the lube oil

Crankcase explosions in propulsion diesel engines result from _____________./the ignition of unburned fuel and air in the crankcase

The blower type crankcase ventilation system ____________./removes combustible gases from the crankcase

Provision is to be made for ventilation of an enclosed  diesel engine crankcase by means of a small ________./breather or by means of a slight suction not exceeding 1" of water

Under normal conditions, the main source of crankcase oil contamination is attributed to ______________./breakdown of the lubricating oil

Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?/Lube oil is diluted and its viscosity is reduced.

When fuel enters the crankcase of a diesel engine, it  _____________./dilutes the lube oil and reduces its viscosity

If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?/Allow the engine to cool before opening the crankcase.

If a crankcase explosion occurs in a diesel engine, you  should stop the engine and _____________./allow the engine to cool naturally

If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of the following precautions should be observed?/The crankcase should remain unopened until the engine has cooled.

If water is found in the crankcase of a diesel engine, the cause may be due to _____________./all of the above

How does water enter the crankcase of a diesel engine?/As water vapor contained in blow-by.

Water accumulating in the crankcase of a diesel engine could indicate _____________./a cracked cylinder liner

Diesel engine "blow-by" into the crankcase is caused by excessive ring ____________./gap clearance

In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the _____________./compression rings

An increase in crankcase pressure generally indicates  _____________./worn engine cylinder liners

A substantial increase in crankcase pressure could be an indication of _____________./a worn cylinder liner

An increase in diesel engine crankcase pressure generally indicates excessive _____________./piston ring blow-by

A substantial increase in crankcase pressure could be an indication of a/an _____________./worn cylinder liner

If you notice smoke coming from the crankcase exhaust fan outlet of an operating diesel engine, you would suspect ___________./broken piston rings

CYLINDER HEAD               print

question/Correct answer

A cracked cylinder head on a diesel engine may be indicated by _____________./combustion gases venting at the expansion tank

A cracked cylinder head in an operating engine may be  indicated by _____________./combustion gases venting at the expansion tank

Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages?/Hot spots will develop.

Diesel engine cylinder head test cocks are used to ________./connect the pressure indicator

Diesel engine cylinder head test cocks are used to ________./remove moisture accumulations from cylinders prior to  starting

When turning a new cylinder head stud on a lathe, the  minimum effective thread length of the stud is determined primarily by the _____________./stud diameter

An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with _____________./gaskets

Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?/Blocked cooling water passages to the head

A diesel engine cylinder head can crack as a result of  _____________./restricted cooling passages

Valve rotators are commonly used on which of the listed  diesel engine cylinder head valves?/Exhaust

One end of a diesel engine cylinder is sealed by the  cylinder head and the other end by the _____________./piston

Worn cylinder head valve seats in a diesel engine will cause ____________./less cold valve lash

Valves in the cylinder head of a diesel engine are opened by the direct action of the _____________./rocker arm movement

Cylinder Liners

question/Correct answer                  print

Integral water jacket liners use O-rings near the bottom of the liner. These O-rings serve to ______________./prevent the escape of lubricating oil from the crankcase

Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits, may cause _____________./increased piston wear

The most severe cavitation erosion occurring on the   waterside of diesel engine wet cylinder liners normally  occurs ____________./near the middle of the thrust side of the liner

A crack in a cylinder liner can be caused by _____________./restricted cooling water passages

In a diesel engine, a cylinder liner should be replaced ifit is ______________.I. scuffedII. scored/II only is correct

In a diesel engine, an integral liner is one in which thecooling water __________.  I. flows through the cylinder liner jackets  II. touches the outer side of the liner/I only

The cylinder liner forming the cylinder wall and the inside of the water jacket is called a _____________./wet liner

The purpose of counterboring the top of the cylinder liner, extending down to the top point of travel of the top  compression ring, is to _____________./prevent wear of the liner from forming a ridge at the upper level of ring travel

Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?/Pores in the plating aid in maintaining the lube oil film.

A properly honed diesel engine cylinder liner will ________./shorten the ring break-in period

The lower water seal on a diesel engine wet cylinder liner must allow for liner axial movement. This seal is most  commonly a _____________./neoprene O-ring

Which of the diesel engine cylinder liners listed has  internal cooling water passages?/Integral water-jacket liner.

The lower water seal on a diesel engine wet cylinder liner must allow for liner expansion and contraction. This seal is most  commonly a _____________./neoprene O-ring

It is easier to replace a dry cylinder liner than a wet one because ____________./water seals are not required

One advantage of dry cylinder liners used in a diesel engine is the _____________./procedure to replace dry liners is simpler than for wet liners

One of the advantages in the use of a dry liner over a wet liner is _____________./there is less likelihood of water leaking into the   combustion space

In certain cases, a cylinder liner can be refinished rather than replaced. When properly honed, the _____________./liner surface should have a crosshatch pattern

A properly honed diesel engine cylinder liner will ________./shorten the ring break-in period

Which of the following statements concerning cylinder liner wear in a single acting diesel engine is correct?/Excessive liner wear causes wear between piston rings and grooves.

Generally, where should you expect to find the greatest  amount of wear on a cylinder liner?/Opposite the top ring shortly after piston travel has ended the compression stroke.

The rate of wear on a cylinder liner depends on the   _____________./all of the above

A scored diesel engine cylinder liner will cause __________./rapid wearing of piston rings

Which of the following statements concerning cylinder liner wear is true?/Excessive liner wear causes wear between piston ring and groove.

Scuffed cylinder liner surfaces in a diesel engine can  result from ______________./operating an overheated engine

Which of the following operations will have a direct impact on the rate of wear in a cylinder liner ____________./quality of fuel injected

Scuffed cylinder liner wearing surfaces in a diesel engine can result from _____________./applying load to a cold diesel engine

Scuffed cylinder liner wearing surfaces in a diesel engine can result from _____________./operating the engine overheated

What is to be installed on an internal combustion engine if its cylinder bore exceeds eight inches?/Explosion relief valves

An inline engine having a nine inch bore and more than eight cylinders will _________./have three explosion relief valves

Cylinders diameters greater than 230 mm require additional safety devices when the scavenging spaces are openly  connected to the cylinders. Which of the following devices will be used to protect such spaces?/Explosion relief valves

What is required for crosshead type engines that have a  scavenging space in open connection to the cylinder?/The scavenging space is to be permanently connected to an approved fire extinguishing system, entirely separate from the fire extinguishing system of the engine room.

Engine displacement is equal to the cylinder _____________./area times the stroke, times the number of cylinders

Successful combustion inside the cylinders of a diesel  engine is dependent upon _____________./all of the above

Turbulence in a diesel engine cylinder is of major   importance in providing _____________./complete fuel/air mixing

In a full floating wristpin, the pin is prevented from  sliding against the cylinder walls by _____________./snap rings

Individual cylinder performance in a diesel engine is  routinely determined by exhaust gas _____________./pyrometer readings

Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by _____________./a badly worn piston pin

Combustion knock can occur in the cylinders of a diesel  engine under any condition permitting _____________./excess fuel in the combustion chamber

Excessive diesel engine cylinder exhaust back pressure  will be caused by _____________./an obstruction in the exhaust silencer

Which of the listed designs is effectively used to provide the turbulence necessary for proper combustion in a diesel engine cylinder?/Precombustion chamber

The highest pressure in a diesel engine cylinder normally occurs _____________./after TDC

Turbulence is created in the cylinders of a diesel engine to _____________./help mix fuel and air

A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective  pressure?/17.6 kg/cm2

Forcing the exhaust gases from the cylinder of an operating diesel engine with the aid of a blower is known as ________./scavenging

The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called _________./supercharging

A diesel engine indicator diagram measures 12.5 cm in length and has an area of 22 cm2. What is the cylinder mean  effective pressure if the spring used has a scale of 1.25 mm equals 1 kg/cm2?/22.0 kg/cm2

Using a diesel engine indicator P-V diagram, the cylinder mean effective pressure is calculated to be 21.3 kg/cm2. What is the scale of the spring used on the indicator if the diagram area is 18.46 cm2 with a length of 13 cm?/1.5

The bore of a diesel engine cylinder describes the ________./inside diameter of the cylinder

Air scavenging of a diesel engine cylinder _____________./all of the above

By comparing the exhaust gas output of each cylinder of a diesel engine, one method of determining if the engine load is balanced is by the use of a ______________./pyrometer

By comparing the exhaust gas output of each cylinder of a diesel engine, one method of determining if the engine load is balanced is by the use of a ______________./pyrometer

Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior to starting?/To ensure foreign material (water etc.) is not present in the cylinders.

Cylinder linings constructed as an integral part of the  block, are characterized by which of the following   disadvantages?/They cannot be replaced.

Wear is usually greatest at the top of the cylinder bore of a diesel engine due to the ____________./highest pressures being exerted

For a diesel engine, individual cylinder performance is  commonly determined by exhaust gas _____________./pyrometer readings

Which of the listed diesel engine systems is likely to  create the problem of a cylinder regularly misfiring?/Fuel

Water accumulation in the cylinder of a secured engine is an indication that the _____________./cylinder liner may be cracked

Which of the listed conditions will affect the mean   effective pressure the most in the cylinders of a diesel engine?/Completeness in the mixing of the fuel and air

The greatest turbulence in a diesel engine cylinder is  created by the _____________./shape of the combustion chamber

Exhaust and Inlet Valves:            print

question/Correct Answer

In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because  _____________./intake valves are less affected to the corrosive action of exhaust gases

The opening of an exhaust valve on a modern, large, low- speed, main propulsion diesel engine, may be actuated by _____________./hydraulic "push rods"

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by _____________./compressed air pressure

If the intake, or exhaust valve stem clearance is found to be excessive, in addition to too little movement of the  rocker arms, you should check for _____________./collapsed hydraulic valve lifters

A burned exhaust valve may be detected by a higher than  normal ____________./exhaust temperature from a particular cylinder

Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?/All of the above

In a diesel engine, a leaking exhaust valve can cause  _____________./misfiring

Exhaust valve grooving and corrosion is caused by certain components of residual fuel oil. These components are  sodium, sulfur, and _____________./vanadium

The easiest way to locate a defective diesel engine exhaust valves is by _____________./comparing exhaust pyrometer readings

Increasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening __________./later and closing earlier

Diesel engine exhaust valve springs are under compression when they are __________./in any position

A diesel engine exhaust valve spring is under compression when _____________./all of the above

The intake and exhaust valves used in a diesel engine are returned to their seats by _____________./spring force

In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?/Uniflow

The purpose of an interference angle in a diesel engine exhaust valve is to ________.  I. work in conjunction with valve rotators to rotate   the valve  II. break up seat deposits/II only

The purpose of an interference angle in a diesel engine exhaust valve is to ________. I. break up seat deposits  II. work in conjunction with valve rotators to rotate   the valve/I only

The exhaust valve opens before bottom dead center in a four stroke engine to___________.  I. allow for blow down  II. reduce pumping losses/both I and II

The purpose of an interference angle in a diesel engine exhaust valve is to ________.  I. seat the valve quickly  II. break up seat deposits/both I and II

The purpose of an interference angle in a diesel engine exhaust valve is to ________.  I. work in conjunction with valve rotators to rotate   the valve  II. seat the valve quickly/II only

In a diesel engine, exhaust valves open before the intake ports are uncovered to ___________.  I. reduce pumping losses  II. reduce back pressure/both I and II

A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is ____________./vanadium

During diesel engine warm-up, which type of valve lash  adjuster listed allows for the change in length of the  exhaust valves?/Hydraulic

Which of the listed design features is found in an exhaust valve and NOT in an intake valve?/Hard alloy steel construction

Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to _____________./assist in dissipating heat due to the extreme operating  temperatures

A built-up exhaust valve is one in which _____________./the stem and heads are made of different material

The size of the exhaust valve opening is ____________./most critical in a two-stroke/cycle diesel engine

Exhaust valve openings in a diesel engine cylinder head are made as large as practical to _____________./reduce the pumping loss associated with scavenging

The satisfactory operation of diesel engine exhaust valves usually depends on ______________./correct timing and proper seating

Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open ______________./earlier and remain open longer

Multiple concentric valve springs are often used with diesel engine valves to ____________./operate the valve gear where a larger force is normally  required, but space limitations restrict the use of a single large spring

If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will _____________./open late and close early

Increasing the valve clearance between a valve stem and  rocker arm, will result in the valve _____________./staying open for a shorter period of time

Which of the listed items should be secured before   performing any maintenance on a solenoid operated air start valve?/Electric power

An important design characteristic of an explosion relief valve for a diesel engine is the ability to _________./close quickly in order to prevent an inrush of air

Which statement regarding the arrangement and location of explosion relief valves used on an internal combustion  engines is true_____________?/Minimizing the danger from emission of flame is a key  consideration

Collapsed hydraulic valve lifters in a diesel engine will result in ____________./excessive valve clearance

At what pressure should a cylinder relief valve of an  internal combustion engine be set to relieve?/The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure.

The diesel engine valve subjected to most severe conditions of service is the ____________./cylinder exhaust valve

When the cold tappet clearance is less than that specified by the engine manufacturer, the diesel engine valves will _____________./open earlier than normal

In diesel engines, hydraulic valve lifters are used to  ____________./reduce valve gear pounding

Valve lash, or clearance refers to the _____________./clearance between the top of the valve stem and the rocker arm

What is the purpose of a hydraulic valve lash adjuster?/Allows for constant contact between the valve stem and the rocker arm regardless of whether the engine is cold or warm.

Diesel engine valve springs function to _____________./close the valves

Valve cages are used on some large diesel engines to  _____________./facilitate valve removal for servicing

During warm-up the expansion of valve stems due to engine heat, is allowed for by the _____________./valve lash

In a diesel engine, the spring force required for proper valve operation is determined by _____________./cam contour

According to Coast Guard regulations, isolation valves used in keel cooler installations are permitted to be constructed of ____________./bronze

If a single cylinder relief valve on a diesel engine lifts frequently while the engine is running, the cause may be an _____________./incorrectly adjusted fuel injector

Diesel engine air start valve timing is controlled by  _____________./individual cams and valve gear

If there is a "clicking" sound in the valve compartment of a diesel engine, the cause may be _____________./excessive valve lash

Excessively worn, or polished ends on a diesel engine valve spring, indicate ________________./spring surge

Excessive valve clearance will cause a valve to open  _____________./late and close early

The valve stem expansion associated with engine warm-up is allowed for by the ____________./valve lash adjusters

Diesel engine air start system check valves are opened by _____________./starting air pressure

Excessive valve lash in an auxiliary diesel engine will  cause the valves to open _____________./later and close sooner

If the valve lash on a diesel engine is set improperly,  which of the following statements represents the most  serious problem that can develop?/Too little lash may prevent the valves from seating   properly.

If you increase the clearance between a valve stem and  rocker arm, which of the listed conditions will occur?/Valve will open later.

Reducing the clearance between a valve stem and rocker arm will result in the valve _____________./having a longer duration of opening

If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring  failure would be _____________./cracks in the surface of the spring

If the relief valve on a diesel engine cylinder lifts, the cause could be due to _____________./liquid in the cylinder

Which of the listed items should be secured before   performing any maintenance on a solenoid operated air start valve?/Electric power and starting air

Bouncing of the valve gear in a diesel engine can be caused by _____________./spring surge

Spring surge in diesel engine valve springs can result in _____________./bouncing of the valve gear

If a clicking sound is being produced from within the valve compartment of a diesel engine, the cause may be __________./all of the above

The force exerted by a valve spring to close the diesel  engine valves, is proportional to _____________./spring compression

Four stroke cycle:

question/Correct Answer           print

Clearance volume scavenging in a turbocharged,    four-stroke/cycle diesel engine is accomplished ___________./during the valve overlap period

Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the _____________./compression stroke

Scavenging in a four-stroke/cycle diesel engine occurs  during the _____________./last part of the exhaust stroke, and the first part of the intake stroke

Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a   four-stroke/cycle, turbocharged, diesel engine?/A defective aftercooler

In a four-stroke/cycle diesel engine, the camshaft rotates at _____________./half the crankshaft speed

If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be _____________./775 RPM

What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?/1500 RPM

The camshaft on a four-stroke/cycle diesel engine provides a means to operate the _____________./all of the above

The reversing cams of some four-stroke/cycle diesel engines are brought into position by ____________./sliding the camshaft along its axis

In a closed cooling system for a turbocharged,    four-stroke/cycle diesel engine, fluctuating water pressure can be caused by ________________./improper venting of the cooling system

Any increase in the exhaust back pressure of a    four-stroke/cycle diesel engine will _____________./reduce engine horsepower output

If fuel injection to a four-stroke/cycle diesel engine  begins earlier than designed, ignition may be delayed  because the ____________./cylinder compression pressure may not be high enough

Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as  _____________./turbulence

A V-12 four-stroke/cycle 500 horsepower diesel engine is operating under a normal load, the firing pressures are low and the exhaust temperatures are high. Which of the  following problems is the most probable cause of this  condition?/The exhaust back pressure is too high.

A six cylinder, single acting, four-stroke/cycle diesel  engine has a bore of 10 1/2 inches(26.6 cm), and a stroke of one foot(30.5 cm), producing 75 HP (5.6 kw) per cylinder at 720 RPM. What is the mean effective pressure for the stated conditions?/79.4 psig (547.4 kPa)

In a four-stroke/cycle diesel engine, badly worn intake  valve guides can cause excessive ____________./lube oil consumption

A four cylinder, four stroke/cycle, single acting diesel engine has a 740 mm bore and a 1500 mm stroke. What  indicated power will be developed if the average mean  effective pressure is 18 kg/cm2 at a speed of 90 RPM?/3416 kW

Scavenging in a turbocharged,    four-stroke/cycle diesel engine is accomplished ___________./during the valve overlap period

Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?/At full load the intake manifold pressure is greater than the exhaust manifold pressure.

For a four-stroke/cycle medium-speed diesel engine, fuel injection commences from 7 to 26 crankshaft degrees before top dead center. After fuel injection commences, how many degrees does the camshaft rotate before the exhaust valve push rod moves up?/66‚-76‚

In a single acting, four-stroke/cycle diesel engine, the  power impulse in an individual cylinder occurs ____________./once every two crankshaft revolutions

Cylinder scavenging in a turbocharged, four-stroke/cycle, single acting, diesel engine is accomplished _____________./during the valve overlap period

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for _____________./improving cylinder scavenging

In a turbocharged four-stroke/cycle diesel engine, the  exhaust valve remains open until after top dead center and the intake valve opens before top dead center to __________./produce a scavenging effect in the combustion space

A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to increase the ______________./purge of exhausted gases from the cylinders

Which of the listed adjustments must be made to a naturally aspirated four-stroke/cycle diesel engine if a turbocharger is to be installed?/Increase the exhaust and intake valve overlap.

Which of the changes in the valve timing listed should be carried out when a naturally aspirated four-stroke/cycle diesel engine is converted to a supercharged engine?/Advance the intake valve opening and retard the exhaust  valve closing periods.

When a naturally aspirated four-stroke/cycle diesel engine is converted for supercharging, which of the following  changes must be made to the valve timing?/The intake valve opening is advanced and the exhaust valve closing is retarded.

If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?/Exhaust temperatures will be high.

An eight cylinder, four stroke/cycle, single acting diesel engine has a 650 mm bore and a 1400 mm stroke. What will be the developed indicated metric horsepower if the average mean effective pressure is 30 kg/cm2 at a speed of 100 RPM?/9,111 kW

The camshaft on a four-stroke/cycle diesel engine is used to operate the _____________./all of the above

A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated, four-stroke/cycle diesel engine in order to increase the _____________./cooling effect on the exhaust valves

A connecting rod in a four-stroke/cycle diesel engine is subject to ____________./compression load during power and compression strokes

In a four-stroke/cycle diesel engine the intake valves open _______./before TDC and close after BDC

During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ___________./effective cylinder scavenging and cooling

A four-stroke, cycle, turbocharged, 1000 horsepower diesel engine has been operating under load. The load suddenly increases, causing excessive black exhaust smoke, and a  rapid rise in the lube oil temperature. In response to this condition, you should _/reduce load

A four-stroke/cycle, 1000 horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperature. The reason for the failure could be _______________./worn valve seats and valves

The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the _____________./kilowatt load

A disadvantage of a four-stroke/cycle diesel engine is  _____________./fewer power strokes per revolution of the crankshaft

The angular distance a flywheel rotates between the firing of the cylinders of a V-16, four-stroke/cycle diesel engine is _____________./45.00‚

High exhaust temperatures from all of the cylinders of a turbocharged, four-stroke/cycle diesel engine can be caused by an _____________./inoperative turbocharger

Fuel pumps

question/Correct Answer            print

Which of the fuel systems listed combines the injection pump and the injection nozzle in one housing?/Unit injector

Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and an individual pump for each cylinder?/Jerk pump injection

Fuel injection pumps using the port and helix metering  principle requires the use of a ___________./lapped plunger and barrel

The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to _____________./assist in a quick cutoff of fuel injection

Where is the fuel delivery check valve located in a jerk pump fuel injection system?/In the injection pump housing discharge

The delivery valve installed in a port and helix fuel  injection pump is designed to ____________./maintain a column of fuel in the line

The main difference between an "APF" and an "APE" type fuel injection pump, is the design of the ____________./cylinder arrangement

A port-and-helix fuel injection pump having upper and lower plunger helixes is designed to _____________./vary the beginning and ending of injection

Which of the following statements describes a fuel injection pump marked "timed for port closing"?/Injection has a constant beginning and variable ending.

The port-and-helix metering pumps, used in diesel fuel  injection systems, are usually designed to produce a  constant beginning and a variable ending of fuel injection. These pumps are usually _____________./timed for port closing

The end of fuel injection in a port-and-helix metering pump can be controlled by _____________./uncovering a fuel port in the pump barrel

The amount of fuel delivered by a helical plunger fuel  injection pump is controlled by _____________./rotation of the pump plunger

The duration of fuel injection developed by an individual port-and-helix fuel injection pump, is determined by the ____________./effective pump stroke

Movement of the pump control rack in a fuel injection system using individual plunger-type pumps _____________./varies the quantity of fuel delivered

The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the ________________./plunger control rack position

The amount of fuel delivered by a helical plunger type fuel injection pump is controlled by _____________./rotation of the pump plunger

On a diesel engine equipped with individual jerk type fuel pumps, adjustments should be made to the tappets (push rods) of the pumps to ____________./equalize effective delivery strokes

The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the _____________./governor

The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the _____________./control rack

A fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzle. This requires   immediate repair because of the _____________./serious fire hazard

Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires _____________./replacing the plunger and the barrel

While overhauling a jerk-type fuel pump it is necessary to replace the pump plunger. Which of the parts listed below must also be replaced?/Pump barrel

If the plunger or barrel of a fuel injection jerk pump  becomes damaged, _____________./the barrel and plunger must be replaced as a unit

Uneven bolt tightening during the installation of a fuel injection pump can result in _____________./binding of pump moving parts

If lost motion is present in an individual fuel injection pump, which of the following problems will occur?/Fuel injection will occur later.

If the plunger or barrel of a fuel injection jerk pump  becomes damaged, _____________./the entire pump must be replaced

The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to _____________.                     I. assist in a quick cutoff of fuel injection  II. prevent fuel oil backflow from the injection pump/I only

Problems with the diesel engine fuel injection pump are  usually caused by _____________./contaminated fuel

An increase in the fuel injection pump discharge pressure can be caused by a/an _____________./plugged injector spray hole

Fuel SYSTEMS         print

question/Correct Answer

Coast Guard Regulations (46 CFR) permit drain valves in the machinery space for removing water and impurities from  diesel engine fuel systems. Those valves must be   ____________./fitted with caps or plugs to prevent leakage

Coast Guard Regulations (46 CFR) permit the use of drain valves for removing water or impurities from diesel engine fuel systems. These valves must be ____________./located in the machinery space

Coast Guard Regulations (46 CFR) require steel tubing  connections and fittings used with diesel fuel oil systems, to be either flared or _____________./of the flareless nonbite type

The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to _____________./maintain specified injection characteristics

To prevent vibration damage to the fuel supply line of a diesel engine, you may use ____________./a length of approved flexible nonmetallic hose

Which of the listed types of gasket material should be used on high pressure fuel oil lines on a diesel engine?/Soft copper

Fuel is admitted to a diesel engine cylinder through the _____________./injector nozzles

Microbiological growths in marine fuel are a common   occurrence that can be ________./extremely detrimental to equipment and operating processes

The light and medium fuels utilized in internal combustion engines provide a source of ________./food for microbiological organisms

Fuels as produced in a refinery are generally sterile,  however, contamination can occur as fuels are ________./All of the above are correct.

Injection pressure in a common rail fuel system is   controlled by _____________./a bypass valve

In order for microbiological growths to thrive in a fuel tank it is necessary for ________./small amounts of water to be present

During the fuel injection period, fuel pressure must exceed cylinder gas pressure to _____________./ensure penetration and distribution of the fuel in the  combustion chamber

Why are heavy fuels not usually prone to the problems of microbiological infection?/The necessary nutrients that the organisms feed on are  in a more complex form and not available for microbial  degradation.

To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of _____________./monel metal or stainless steel

Coast Guard Regulations regarding diesel fuel oil systems,valves for removing water or impurities are ____________./permitted, provided they are fitted with caps or plugs

Most type(s) of microbiological growths in fuel are __________./All of the above

Small amounts of moisture are necessary to trigger the  growth of microbiological organisms found in some marine fuels. Some sources of water contamination are _________./All of the above

The growth rate of microbiological organisms as found in some fuel supplies will __________./increase in direct proportion to an increase in temperature

Which of the following statements describes the unchecked growth of microbiological organisms within a fuel system?/Corrosion of various metal components will occur due to the formation of hydrogen sulfide gas.

A sprayer plate marked 32Y20, as used in a return flow fuel oil system, should only be used with a/an ____________./orifice plate marked 32

Which of the following conditions is NOT an indication of microbial contamination of the fuel supply?/Brightening of copper bearing metals

Variations in the amount of fuel oil burned in a return flow type burner, are controlled by the ____________./back pressure in the fuel oil return line

Which chemical listed is utilized to prevent and correct most microbial infections occurring within fuel storage  systems?/Biocides

Proper housekeeping to prevent the formation of    microbiological growths within a fuel system includes the prevention of water accumulations and the use of _______./chemical additives called biocides

One function of the fuel pump delivery check valve is to _____________./help the injector needle reseat without dribbling at the nozzle holes

The primary function of a fuel delivery check valve assembly is to _____________./provide rapid fuel injection cutoff

An 8000 horsepower diesel engine has a specific fuelconsumption of 0.4 lbs. of fuel per horsepower hour. If eachpound of fuel contains 18,500 BTU's and 25% of theavailable heat leaves the engine with the exhaust, how manyBTU's per hour are theoretically a/14.8 million BTU's per hour

The rate of fuel injection in a diesel engine cylinder  depends primarily on _____________./the size of the holes in the fuel nozzle

Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?/Carbon particles

Some fuel injection systems utilize port-and-helix metering. Which of the following statement describes a system "timed for port closing"?/Injection has a constant beginning and variable ending.

When centrifuging heavy fuel oil, an important factor toconsider is the _________.I. flow rateII. viscosity of the fuel oil/both I and II are correct

The amount of fuel delivered for each cycle must be in  accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power  stroke at that load. Which of the following statements  describes this requirement?/Accurate metering

Fuel oil transfer systems used onboard diesel propelled  vessels are required to have _____./two fuel oil transfer pumps provided where one is to be  independent of the main engine

The term "proper metering", as applied to a diesel fuel  injection system, can be best defined as _____________./delivering the same quantity of fuel to each cylinder for each power stroke according to engine load

When fuel oil heaters are required for main engine   operation, ____________./at least two heaters of approximately equal size are to be installed

Regarding jerk-type fuel pumps as used on some auxiliary diesel engines, the delivery cutoff point is controlled with a _____________./helical groove on the plunger

Valves and fittings used with diesel engine fuel oil  pressure piping may be threaded in sizes up to and including 60 mm O.D., but screwed unions ________./are not to be used on pressure lines in sizes 33 mm O.D. and over

Valves used in diesel engine fuel oil pressure piping are to be _______________./so constructed as to permit packing under pressure

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?/Sludge

Which of the following statements is correct concerning  ABS rules for fuel oil injection systems as found on diesel propelled vessels?/Cut-out valves are to be located at the service tanks and be so arranged as to be operable from the engine room floor plates.

Which of the following manufacturing methods is recommended for diesel engine fuel injection line piping?/Seamless drawn

What type of fitting is to be used on diesel engine fuel injection line piping?/Extra heavy

The ability of a fuel particle to travel into the combustion chamber before burning is called _____________./penetration

Which of the following statements is an accurate description of fuel injection piping used on diesel engines with a  cylinder bore of 250 mm and above?/The piping is to be effectively shielded and secured to  prevent fuel or fuel mist from reaching a source of   ignition on the engine or its surroundings.

If the peak to peak pressure pulsation in the diesel engine fuel injection return piping exceeds 285 psi what special provision is to be provided?/The piping shall be shielded and secured to prevent fuel or fuel mist from reaching a source of ignition on the engine or its surroundings.

In a diesel engine mechanical-type fuel pump, the delivery check valve is opened by ____________./hydraulic action

What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?/Atomizing

Diesel engine fuel oil leakage should be drained and  additional precautions provided to __________./prevent contamination of lubricating oil by fuel oil

When is fuel injected into a cylinder of diesel engines?/After air in the cylinder is compressed.

Proper dispersion of fuel in a diesel engine cylinder is dependent upon the _____________./all of the above

Diesel fuel oil having a low cetane rating can result in _____________./combustion knock

The minimum fuel oil delivery pressure required for   efficient injection depends primarily on the ______________./maximum pressure in the engine cylinders during injection

Proper filtering and straining of diesel fuel is important because the _____________./fuel injectors may be damaged by foreign particles in the fuel oil

In the Otto cycle, the fuel/air mixture is ignited at what point and by what means?/Just before TDC by spark ignition.

Fuel is ignited in a diesel engine cylinder by ____________./the heat of compression

In a diesel engine, the time taken to heat the fuel   particles, turn them into vapor, and bring about combustion is called _____________./ignition delay

Persistent knocking of one cylinder of a diesel engine  ceases when the fuel supply to that cylinder is secured. This problem may be a result of ______________./faulty combustion in that cylinder

The efficient burning of fuel in a diesel engine is   dependent upon the _____________./all of the above

One cylinder of a diesel engine is persistently knocking and does not cease when the fuel supply to that cylinder is  secured. Which of the following problems may be the cause?/A mechanical defect in a working part

What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?/Heat of compression

A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to   _____________./frequently check the cylinder exhaust temperature

Modern marine diesel engines using mechanical fuel   injection, operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is _________./a combination of constant volume and constant pressure

Which of the following statements describes the results of excessive microbiological growths within a fuel system?/The deposits produced by these growths form blockages and flow restrictions ultimately leading to improper atomization of the fuel into the cylinders.

Significant retardation of a diesel engine fuel injection timing will result in _____________./reduced engine power

Late fuel oil injection in a diesel engine can result in _____________./high exhaust temperature

When fuel is injected late into a diesel engine cylinder, _____________./fuel consumption will be high

When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should _____________./change the lube oil more frequently than normal

In a diesel engine, late fuel injection is indicated by  black or gray exhaust smoke with ______________./low firing pressure

A diesel engine will lose power if fuel injection occurs too late in the cycle, because the ______________./maximum expansion of the burned fuel cannot take place in the cylinder

Late fuel injection timing is indicated by ____________./lower than normal cylinder pressure and high exhaust  temperature

Late fuel injection in a diesel engine is indicated by low firing pressure with _____________./high exhaust temperature

The microbiological growths that affect fuel supplies can easily be transported from one location to another by  _________./air, solids, or liquids

Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and   _____________./low firing pressure

Late fuel injection in a diesel engine is indicated by low firing pressure with _____________./black or gray exhaust smoke

Late fuel injection in a diesel engine is indicated byblack or gray exhaust smoke with a _____________./low firing pressure

The sludge tank installed in the diesel engine room is used to collect _____________. I. sludge from the fuel oil settling tanks and  centrifuge II. water that has been collected in the settling tank./both I and II

The major cause of problems occurring with fuel injection equipment is _____________./dirt in the fuel

Which of the following problems is the main source of fuel pump and injection system malfunctions?/Improper adjustments

Fuel oil strainers should be made of ____________.  I. copper  II. brass/neither I nor II

A dirty fuel oil filter is can be detected by ________.  I. fuel oil analysis  II. observing the pressure drop across the filter/II only

When fuel is injected too early in the injection cycle, it may cause the engine to have _____________./early detonation and a loss of power

Early fuel injection timing is indicated by the cylinder pressure being _____________./above normal with a below normal exhaust temperature

When fuel is injected in a diesel engine cylinder too  early, _____________./ignition may be delayed

Which of the listed set of conditions indicates early fuel injection timing?/Higher than normal firing pressure and low exhaust   temperature

A diesel engine will lose power if fuel injection occurs too early because the _____________./ignition will be delayed due to low ignition temperature

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

A fuel injection valve opening at a pressure lower than  normal will result in _____________./early fuel injection

If fuel injection occurs too early, a diesel engine will lose power because the _____________./ignition will be delayed due to low compression pressure

Due to excessive water in the fuel, a diesel engine fails to start. Before the engine can be started, the water must be removed from the ____________./all of the above

A diesel engine fails to start due to excessive water in the fuel. Before the engine can be started, the water should be removed from the _____________./fuel lines

A diesel engine fails to start because of water in the fuel. In order to start the engine, you should ____________./drain filters and strainers and bleed off water at each  injection pump

Water in the fuel can prevent the engine from starting,  prevent it from developing full power, or ____________./run at an irregular speed

Permitting a diesel engine fuel oil day tank to run dry can cause _____________./air in the fuel system

If a diesel engine runs out of fuel, you can expect trouble from _____________./air in the fuel system

Air in the fuel lines of a diesel engine can cause   _____________./ignition failure

If you suspect a diesel engine is misfiring due to air  leakage into the fuel system, you should begin looking for the leak at the _____________./suction side of the fuel oil transfer pump

If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from _____________./air in the fuel system

Air may be bled from the fuel system by _____________./loosening the compression nuts at the injectors

If you determine that entrained air in the fuel oil system is causing a diesel engine to stall, you should first check for _____________./loose fittings in the booster fuel pump suction piping

Your vessel is about to begin maneuvering, in order to carry out easy restarting of a large heavy fuel diesel engine that has been stopped for some time, you should have ___________./shifted to a fuel having a higher cetane number

Air in the fuel can cause _____________./the engine to stop

After changing out the fuel filters the diesel engine fails to restart. The most probable cause for this condition is a/an ____________./air-bound fuel system

Dirt in a fuel oil system of a diesel engine can cause  _____________./injector damage

The most common diesel engine fuel system problems are  caused by _____________./dirty fuel

Diesel engine fuel oil contamination often results in  _____________./fuel injection system malfunctions

The major cause of fuel pump and injection system problems is _____________./contaminated fuel

A diesel engine operating at a light load, when compared to operating at heavy load has a fuel/air ratio that is   __________./higher

A dirty fuel oil filter element can be detected by ________./the pressure drop across the filter

The main source of fuel pump and injection system   malfunctions is _____________./contaminated fuel

Poor timing of the fuel injection system is similar to the effects of poor _____________./control of the rate of fuel injection

The "breaking-up" of fuel as it enters a diesel engine  cylinder is known as _____________./atomization

Clogged diesel engine fuel oil filters can cause __________,/All of the above

The manufacturer of a particular diesel engine recommends when running on heavy fuel for the vanadium content not to exceed 300 ppm. If there are 10 ounces of vanadium per 3125 pounds of fuel just taken on board, which of the following statements is corre/The vanadium content is well within recommended limits.

The desirable properties of a marine fuel oil should include _____________./high heating value and low sulphur content

Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount?/Increased valve wear

Burning fuel with a high sulfur content in a diesel engine will _____________./produce corrosion in the cylinder and exhaust system at low loads

Which of the following problems may occur when using fuel oil with a high sulphur content?/Corrosion

The consistent burning of fuel oil with a high sulfur  content in a diesel engine will result in _____________./increased cylinder liner wear

The burning of fuel oil in a diesel engine having a high sodium content, will cause ____________./corrosion and grooving of exhaust valves

The cetane number rates fuels for diesel engines according to its _____________./ignition qualities

Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?/Cetane number

The cetane number of a diesel fuel oil indicates its  ______________./ignition quality

The cetane rating of diesel fuel is an indication of the ______________./ignition quality of the fuel

Which of the following represents the significance the fuel oil cetane number?/Ignition lag is reduced with fuels having a high cetane  number.

Fuel oil having a low cetane rating could result in _______./excessive fuel oil consumption

Which of the following statements is true concerning the cetane number of diesel fuel?/Ignition lag is reduced with fuels having a high cetane  number.

Which of the following statements is true concerning the cetane number rating of diesel fuel?/All of the above.

With respect to diesel fuel, the ease with which a cold  engine will start is dependent upon the _____________./ignition quality of the fuel

Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the _____________./compression of air by the piston

The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the ______________./firing pressure in the engine

In the cylinder of a diesel engine, fuel is ignited by the _____________./heat of compression within the cylinder

Fuel oil day tanks for diesel engines must be checked and cleaned at regular intervals in order to remove ___________./all of the above

The depth of fuel oil in a tank is normally measured through the _____________./sounding tube

Fuel oil is regularly transferred to the day tank in order to _____________./all of the above

Which of the listed contaminants will be satisfactorily  removed from fuel oil by centrifuging?/Sludge

One engine manufacturer recommends heavy fuel oil should not be heated above 80°C to 95°C (176°F to 203°F) before  purification. This upper limit should be observed to ensure against ____________./operation within the explosive range of the fuel

The most effective method in removing water from diesel fuel oil is by _____________./centrifuging the fuel

For optimum results, centrifugal purification of heavy  fuel oil should be accomplished with the fuel at the  lowest practicable ______________./throughput

Heavy residual fuel oils are heated prior to centrifuging to _____________./reduce fuel viscosity

A centrifuge will satisfactorily remove which of the  following contaminants from fuel oil?/Water

If fuel oil were being discharged from the waste water  outlet of a fuel oil disk type centrifuge, operated as a separator, you should ________________./reprime the purifier

A centrifugal fuel oil purifier should be shut down if  _____________./the purifier has a bad vibration when started

If diesel fuel was discharging from the waste water outlet of a disk type centrifugal purifier operating as a separator you should _____________./reprime the purifier

Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?/The specific gravity of the fuel.

Brake specific fuel consumption is given in units of ______./lbs/bhp-hr

The adverse effects of burning high sulfur fuel can be  compensated for by using a cylinder oil having sufficient ________________./alkalinity

When restarting a heavy fuel diesel engine that has been stopped for some time, the engineer should _______________./use a fuel having a lower ignition temperature

Combustion knock will most likely occur as a result of using a fuel with _____________./low ignition quality

The main source of fuel injection system malfunctions is ___________./contaminated fuel

FUEL VLAVES

question/Correct answer      print

The main advantage of unit injectors over other fuel  injection systems is _____________./the lack of high pressure fuel lines

In a unit injector, an upper helix and lower helix are  machined in the lower part of the plunger for _____________./accurate metering of the fuel oil

A unit type fuel injector is used on a diesel engine to  _____________./all of the above

Fuel injector nozzles are usually of the multi-orifice type with the number and placement of the holes arranged   according to the _____________./design of the combustion chamber

Carbon deposits building up, in, and around the injection nozzle tip are least likely to occur when using which of the listed types of fuel injector nozzles?/Pintle

Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _____________./carbon accumulation on the nozzles

Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by ____________./heat conduction into the water jacket wall

The amount of fuel injected into a cylinder by a unit  injector is controlled by _____________./a metering helix

If the coolant temperature is excessively low as it passes through the internally cooled fuel injectors, the injectors may be damaged by _____________./corrosion of the nozzle tip

The amount of fuel delivered by a unit injector is   controlled by the _____________./rack position

The control rack to a unit injector regulates fuel delivery by _____________./rotating the helix of the plunger

Modern marine diesel engines using mechanical fuel   injectors operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

Compared to other fuel injection systems, unit injectors operate with virtually no _____________./injection lag

Differential needle valves used in fuel injectors are  directly closed by _____________./spring force

Fuel supplied by each unit injector on a two-stroke/cycle single acting diesel engine is directed into each cylinder at a very high pressure through the ____________./spray tip of the injector

One problem resulting from a diesel engine fuel injector opening pressure being lower than specified by the engine manufacturer, is that the _____________./quantity of fuel injected tends to be increased

Injectors for use with heavy fuel oil must be cooled by  either water or light oil to _____________./avoid carbonization of the nozzle tips

If the coolant temperature is too low as it passes through internally cooled fuel injectors, the injectors can be  damaged by ________________./corrosion of the nozzle tip

A distorted spray pattern from a fuel injector can cause _____________./loss of power

When the opening pressure of a diesel fuel injector is  greater than that specified by the engine manufacturer, the _____________./quantity of fuel injected is decreased

The spray holes in diesel engine fuel valves should be  cleaned using carbon solvent and _____________./a special cleaning wire

The dripping of fuel from an injector nozzle after injection terminates, often results in ____________./coking and blocking of the fuel nozzles

If it becomes necessary to clean the spray holes in a diesel engine fuel injector, you should use a suitable size piano wire and ______________./carbon solvent

A broken pintle in a fuel injector usually causes _________./distortion of the spray pattern

Visual inspection of a fuel injector valve, removed during overhaul, shows heat discoloration of the lower end of the valve. This is indicative of ____________./valve leakage

In a large, low-speed, main propulsion diesel engine, if the injectors have formed carbon around the nozzle holes, which of the following would help avoid further buildup?/Increase injector cooling water temperature.

In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger  depends on _____________./how the plunger is rotated

If a few injector spray holes become plugged, the result could be _____________./all of the above

A distorted spray pattern from a fuel injector can cause a diesel engine to have _____________./less power output

Plugged spray holes in a diesel engine fuel injector will cause excessive smoking at idling speed, in addition to  _____________./excessive smoking when the engine is under load

Distortion of the spray pattern of a nozzle or injector may be indicated by a/an _____________./smoky exhaust

When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?/Quantity of fuel injected tends to be decreased.

A defective injector nozzle in a propulsion diesel engine can cause _____________./all of the above

A leaking diesel engine fuel injector will cause __________./incomplete combustion

The amount of fuel injected into a diesel engine cylinder by a unit injector, is controlled by _____________./a metering helix inside the pump

A faulty injector in one cylinder of an operating diesel engine can be located by ____________./cutting out individual injectors and noting engine   performance

A change in the quality of fuel atomization by a diesel  engine fuel injector would be caused by a/an ______________./leaking needle valve

Most fuel injection nozzles are opened by _____________./fuel oil pressure

In a jerk pump, the amount of fuel that will be forced  through the spray nozzle on each upward stroke of the  plunger depends on _____________./how the plunger is rotated

The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate  _____________./dry steam from the steam and water mixture

Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than   specified by the engine manufacturer?/The start of injection will be retarded.

Which of the following statements concerning a closed type fuel injection nozzle is true?/Most closed nozzles open inward under the pressure acting on the differential area of the needle valve.

The injection pressure of a hydraulic fuel injection nozzle can be increased by _____________./increasing compression on the pressure spring

Heat damage to fuel injection nozzles can be prevented by avoiding _____________./long periods of engine overload

To minimize the formation of carbon deposits on fuel  injection nozzles, you should _____________./avoid prolonged overloading of the engine

When a nozzle tester is used to check the spray pattern of an injection nozzle, _____________./the oil spray could cause blood poisoning if the spray  penetrates the skin of the operator

The principal hazard to personnel when a diesel nozzle  tester is in use is _____________./blood poisoning

When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be  indicated by a ____________./distorted spray pattern

You are testing a non-popping closed fuel injection nozzle using a nozzle tester. A pressure slightly less than design valve opening pressure is applied. If no fuel appears at the spray tip, the _______________./needle valve is seating properly

Which of the fuel nozzles listed requires the LEAST   maintenance?/Pintle

Which of the following problems could cause misalignment between the needle valve and nozzle in a fuel injection  nozzle?/All of the above.

A multi-orifice fuel injection nozzle is usually used with which of the listed types of combustion chamber?/Open combustion chamber

When a fuel injection nozzle overheats, which of the  problems listed can be expected?/The fuel metering will vary.

Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open   position?/Fuel injection timing will change

If the needle valve in a fuel injection nozzle sticks open, _____________./the nozzle will overheat

An incorrect spray pattern produced by a diesel engine fuel injection nozzle can be directly caused by _____________./overcooling of the nozzle

Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by _____________./ensuring good metallic contact between nozzles and cylinder heads

Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause _____________./fuel leakage before and after injection

Differential type fuel oil nozzles in a diesel engine areclosed directly by _____________.  I. spring pressure  II. fuel oil pressure/I only

Faulty operation of diesel engine fuel injection nozzles can be directly caused by _____________./water in the fuel oil supply

Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to _____________./operate with reduced power or stop

Air in the fuel lines to the fuel injection nozzles of a diesel engine will result in _____________./failure to start

Faulty operation of diesel engine fuel injection nozzles can be a direct cause of ______________./sediment in the fuel supply

GOVERNOR

question/Correct answer

Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to _________./fail to react to small speed changes

A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the   manufacturer in a mechanical hydraulic governor, will result in the need to adjust the ____________./compensating needle valve

When the prime movers of two paralleled generators are  equipped with mechanical-hydraulic governors, and are  operating within their designed range, the unit with the least amount of speed droop will ____________./pick up more of any increase in load

An AC diesel generator incapable of being paralleled with the main bus normally employs an isochronous governor in order to _____________./maintain a frequency of 60 cycles per second

The most common contaminate of governor hydraulic fluid is ____________./dirt

A diesel generator governor is hunting. After changing the oil the governor is flushed and the compensation needle  valve is adjusted; but the hunting persists. You should NOW _____________./carefully check for binding in the governor linkage

During a routine round of a diesel engine generator, you observe a low oil level in the governor sump. If there is no visible sign of external leakage, you should suspect the cause to be a/an ________./leakage through the governor drive shaft oil seal

A continuous fluctuation of the speed, due to overcontrol by the governor, is known as _____________./hunting

A diesel engine is equipped with an isochronous hydraulic governor. A decrease in load will cause the engine speed to ____________./increase slightly then returned to original speed

Internal combustion engines are to be fitted with governors to prevent the engines from exceeding the rated speed by more than ______./15 percent

In addition to the normal governor, each main engine havinga maximum continuous output of 300 hp and over, which canbe declutched or which drives a controllable pitchpropeller, ______________./is to be fitted with a separate overspeed device so adjusted that the speed cannot exceed the maximum rated speed by more than 20 percent

If a hydraulic governor has been refilled with oil, the  engine should be operated until it reaches normal   temperature, then the air should be purged, and the _______./compensating needle valve should be adjusted to stabilize operation

The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to _____________./prevent governor hunting

Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as ____________./compensation

Trapped air was bled from the hydraulic system of a diesel engine governor while it had been operating at idle speed. Oil was added to restore the correct level and the air vent plug tightened. The compensating needle valve should then be gradually ______/closed until engine hunting is eliminated

Which of the following adjustments is always required  whenever the diesel engine governor oil has been drained and renewed?/Compensation

On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by   adjusting the _____________./compensating needle valve

How is the diesel engine operating RPM affected when a "ZERO DROOP" setting is selected on the governor?/The RPM will remain the same with or without load.

Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially ___________./decrease

On a diesel engine equipped with an isochronous governor, if the "speed droop" control is reduced to the "zero" setting, the engine _____________./speed will remain fairly constant despite load changes

Air bubbles in a hydraulic governor can cause _____________./sluggish response

In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the _____________./spring-loaded piston accumulator

Governor hunting is caused by _____________./governor overcontrol

If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will _____________./produce excessive speed response to a load change

If the a main propulsion diesel engine governor works  irregularly with a jerking motion, a possible cause can be _____________./a sticking fuel control linkage

Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at _____________./normal operating temperature without a load

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled  diesel generators?/Speed droop

A direct acting, pneumatically controlled governor for a diesel engine operates in a range of 10 to 50 psi. The fuel rack position is at 20 millimeters when the governor air pressure is 30 psi. If the governor air pressure changes to 20 psi, the fuel rack/13 millimeters

The major cause of trouble in a mechanical-hydraulic  governor is contamination of the hydraulic fluid by   _____________./dirt

Compensating needle valve adjustments to a hydraulic  governor should be made with the engine _____________./running at normal operating temperature without load

A main propulsion diesel engine is fitted with a   pneumatically actuated governor, having an operating range of 10 to 60 psig. The current fuel rack setting is 15 mm at 30 psig. If the air pressure to the governor is increased to 40 psig, the fuel rack s/20 mm

To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should _____________./adjust the compensating needle valve

Which of the listed governor operating characteristics is considered to be isochronous?/Zero speed droop

Which of the following statements best describes the  operational characteristics of an isochronous governors?/They strive to maintain a constant prime mover speed for all values of steady load.

The principal characteristic of an isochronous governor is it will _____________./maintain a constant speed with variations of load

Governors used on diesel engines to limit the load must be equipped with _____________./a variable maximum fuel stop

Which of the following devices is a common basic element with nearly all mechanical governors?/Weights acted on by centrifugal force

The required amount in the change of speed necessary before a governor will make a corrective movement is known as  _____________./sensitivity

After each speed change, the compression of the diesel  engine governor speeder spring is returned to a constant value, regardless of the amount of movement of the fuel  control mechanism and engine load. Hence, this results in ____________./isochronous governing

Which of the following devices is common to both mechanical and hydraulic governors?/Flyweights

A change in engine speed is required before a governor is able to make a corrective movement of fuel rack. This  aspect of governing is commonly expressed as a percent and is known as _______________./governor sensitivity

On most diesel engines, the governor controls the output speed by _____________./controlling the amount of fuel injected into the cylinders

Sensitivity for a diesel engine governor is described as the _____________./percent of speed change necessary for corrective action by the fuel control

An overcorrecting and unstable engine governor operation is known as ____________./hunting

Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?/Flyweight centrifugal force

The ability of the governor to prevent fluctuations in  engine speed is termed _____________./stability

In a simple mechanical governor, the _____________./flyweight centrifugal force is balanced by spring force

A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in _________./centrifugal force on the flyweights

Which of the speeder springs listed is more suitable for a governor installed on an engine operating over a wide speed range?/Conical

A propulsion diesel engine, having a maximum continuous  output of over 300 HP, and driving a controllable pitch  propeller, must be fitted with a separate overspeed device, in addition to the normal governor. This second device is to prevent the engine f/0.2

A diesel engine is driving an alternator required to run at1800 RPM. The overspeed governor is normally required tobe set within a range of ______________./1980 to 2070 RPM

The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by  _____________./governor flyweight motion acting on fuel controls through suitable linkage

If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engineRPM will __________./decrease to a slightly lower value

A large, low-speed, main propulsion diesel engine is  operating at rated load and speed while the vessel is in calm seas. As the intensity of the seas increase, the  engine speed governor maintains the same RPM, although the load indicator indicates an in/Decrease the load limit setting.

If the load on a diesel engine equipped with an isochronous hydraulic governor is increased, after compensation is  performed by the governor, the engine speed will __________./remain the same

LUBRICATION

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In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces _____________./some of the oil used by the engine through a filter

In a bypass type filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter __________./flows to the engine bearings

Two important considerations for the proper lubrication ofa diesel engine include, the delivery of the oil insufficient amount, and the ____________./quality of the oil

One advantage of vacuum feed type cylinder lubricators over the liquid sight glass type is ______________./better metering accuracy

Motor vessels usually have independent lube oil systems formain engine and main reduction gears because ______________./contaminants produced by the engine could harm the   reduction gears

How are hydraulic valve lash adjusters on diesel engine  rocker arm assemblies lubricated?/Forced lube oil supply

Reduction gear lube oil temperatures for keel cooler  installations are generally ___________./higher than raw water cooled installations

Lube oil pumps taking suction from the sump of most small marine engines are usually _____________./of the positive displacement type

The lube oil pump used in a diesel engine is a ____________./gear pump

Maximum lube system operating pressure for a diesel engine is normally regulated by a/an _____________./relief valve

The output pressure of a diesel engine lube oil pump is  regulated by a/an _____________./relief valve

Which of the following devices controls the discharge flow rate of an attached, positive displacement, rotary gear, diesel engine, lube oil pump?/The engine speed

In a diesel engine, maximum lube oil system pressure isnormally controlled by _____________./a relief valve

The lube oil cooler is located after the lube oil filter in order for _____________./the filter to operate more efficiently

With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to _____________./all of the above

Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the _____________./All of the above

Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine _____________./main bearings

The rate of cylinder lubricating oil metered to eachcylinder of a large, low-speed, main propulsion diesel  engine is ______________./higher at sea than while maneuvering

Lubrication for the main reduction gears used with diesel engines is usually supplied by _____________./an independent lube oil system

Mechanical lubricators for diesel engine cylinders are  usually small reciprocating pumps which are _____________./adjustable to meet lubrication requirements

Cylinder lubrication oil for low speed main propulsion  diesel engines is admitted to each cylinder during   _____________./the compression stroke

If the chemical analysis of a lube oil sample taken from adiesel engine indicates an increased neutralization number the _________./acidity has increased

Which of the following devices is normally provided to  prevent oil starvation in a diesel engine lubrication system utilizing the "full flow" principle?/Pressure relief bypass line around the filter

Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to _____________./form a protective film on metal surfaces

A spring-loaded relief valve is located on some lube oil filters in full flow systems to _____________./bypass the filter should it become clogged

If the cooling water temperature and the lube oil   temperature in a diesel engine are too high, the cause can be _____________./excessive wear of the cooling water pump

Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to _____________./ensure a positive flow of oil at all times

Where may a strainer be located in a diesel engine lubricating oil system?/In any combination of the above.

Unusually low oil pressure in the lube oil header of a  diesel engine is the result of a/an ____________./air leak in the oil pump suction line

Loss of lubricating oil pressure to the main propulsion  diesel engine will actuate a/an _____________./audible/visual alarm

In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the ______________./breakdown of the lubricating oil itself

On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter   cartridge indicates ____________./piston ring blow-by

Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?/When forced lubrication is used for propulsion engines, one independently driven stand-by pump is to be provided in  addition to the necessary pumps for normal operation.

The pressure differential across a diesel engine lube oil system duplex filter should be checked to _________./determine the need for filter cleaning

What could cause the bypass valve in a full-flow lubrication system to open?/Clogged filter element

Where the size and design of an engine is such that   lubrication before starting is not necessary and an attached pump is normally used, _____________./an independently driven stand-by pump is not required if a complete duplicate of the attached pump is carried as a  spare

Before starting a diesel engine that has an engine driven lube oil pump, the engineer should _____________./pressurize the lube oil system

In a diesel engine lube oil system, which of the following parts should be lubricated first?/Main bearings

A diesel engine using lube oil with too high a viscosity will exhibit _____________./increased starting difficulty in cold weather

Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil ____________./temperature

In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the _____________./bottom of the lube oil sump

To manually bypass a strainer or filter in a shunt type lube oil filtering system, _____________./turn the three-way valve

A dirty lube oil strainer can result in _____________./low bearing oil pressure

In a full flow type lube oil system, the bypass relief valve will lift due to _____________./a clogged filter element

In a diesel engine, crosshatch on the liner surface aids in___________.I. rapid ring seatingII. the retention of lube oil/both I and II are correct

To determine if the lube oil filter elements need changing, ________________./check the pressure drop across the filter

Many lube oil filters have pressure gages installed on both the inlet and outlet in order to indicate the pressure drop across the filter. In normal operation, the pressure drop will _____________./slowly increase

Lube oil cannot be efficiently filtered if its ____________./temperature is too low

Lube oil filters remove contaminants from oil more   efficiently if the oil being filtered is _____________./heated to reduce viscosity

Lube oil filters remove contaminants more efficiently if the oil being filtered is _____________./heated to reduce viscosity

Lube oil accumulating in the cooling water system of a  diesel engine will result in _____________./poor heat transfer

Engine coolant accumulating in the diesel engine lubricating oil can result from a _____________./cracked cylinder head or liner

To properly clean the disks of a metal-edge type strainer in a diesel engine lube oil system, you should _____________./rotate the T-handle spindle one turn

To routinely clean a metal-edge type lube oil strainer, you should _____________./rotate the disc element and drain off the sediment

The metal edge type filters used in diesel engine fuel oil and lube oil systems are normally cleaned in place by  _____________./manually operating a built-in scraper and draining the  filter

A "Blotter test" is performed on the lube oil of a diesel engine to determine the _________./relative detergency remaining

Diesel engine lube oil diluted with fuel oil is indicated by _____________./decreased viscosity

When excessive fuel dilution is noted in the lube oil, the oil should be _____________./changed

Which of the listed cylinder liner surface conditions  indicates proper lubrication?/Bright appearance.

When fuel oil has seriously contaminated a diesel engine lubricating oil, you should ____________./drain and then renew the lube oil supply

A decrease in the flash point of diesel engine lube oil  indicates the lube oil has become _____________./diluted with fuel oil

If a used lube oil analysis indicates excessive fuel  dilution, the lube oil should be _____________./changed

A "detergent-type" lube oil, used in a diesel engine, should be replaced when _____________./fuel oil dilution is 5%

Which of the following test points should be considered a determining factor as to whether or not a diesel generator's lube oil should be drained and renewed?/An extremely high precipitation number.

How often should the lubricating oil of a diesel engine be changed?/According to manufacturer's instructions

If the detergent type lubricating oil being used in a diesel engine is black, the oil _____________./is holding finely dispersed carbon in suspension

Coast Guard Regulations (46 CFR) require emergency diesel generator sets, with forced lubrication systems, to be  provided with a _____________./low lube oil pressure alarm system

Which of the following conditions is indicated when the  lubricating oil of a diesel engine turns dark after a few hours of use?/The oil is functioning normally.

Oil oxidation, as a result of excessively high lube oil  temperature, is harmful to a diesel engine because   _____________./corrosive by-products are usually formed

The oxidation by-products forming in diesel engine lube oil can cause _____________./All of the above

Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperatures?/The oil oxidizes and forms carbon deposits.

Which of the listed conditions can cause a diesel engine to use too much lube oil?/Too much piston ring wear

Excessive lube oil consumption in a diesel engine can be caused by _____________./plugged oil wiper rings

Which of the following problems can cause excessive   consumption of the lubricating oil in a diesel engine?/Excessive piston ring wear

Which of the following conditions can cause excessive lube oil consumption in a diesel engine?/High lube oil temperature

When a leak has developed in the lube oil cooler of an  operating diesel engine, which of the listed operating  conditions can be expected to occur?/Lube oil level decreases

If the manufacturer advises of a normal lube oil consumption for a 4000 horsepower (298.28 kW) diesel engine to be .0001 gal/hp-hr, (5.076 mL/kW-hr), how much oil should the engine consume in one 24 hour period if operated at full load?/9.6 gallons (36.34 L)

Excessive lube oil consumption can result from worn or  broken _____________./all of the above

A condition that can increase the foaming tendency of lube oil is ________./water or moisture contamination

Excessive lubricating oil consumption in a running diesel engine can be caused by _____________./excessive valve-guide clearance

Which of the following problems represents one possible  cause of high lube oil consumption in a four stroke diesel engine?/Worn intake valve guides

Metal particles accumulated from the wearing of components in a diesel engine can result from lube oil that has been contaminated with _____________./any or all of the above

Which of the contaminants listed would remain in the lube oil after filtering?/Fuel oil

If the analysis of used lube oil indicates a high content of iron particles, this could indicate _____________./excessive ring and liner wear

If a used lube oil analysis indicates an excessive chromate content, this means _____________./engine coolant is leaking into the lube oil

The pressure differential across a diesel engine lube oil system duplex filter should be checked to _________./determine the need for filter changing

Oil oxidation as a result of excessively high lube oil  temperature, is harmful to a diesel engine because   _____________./corrosive by-products are usually formed

A decrease in the flash point of the diesel engine lube oil indicates the lube oil is _____________./diluted with fuel oil

Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to _____________./ensure a positive flow of oil at all times

A method of finishing diesel engine cylinder walls to aid in the proper ring seating and lubrication is known as  ____________./cross hatch honing

One device used to determine the amount of fuel dilution of diesel engine lube oil is a/an ____________./viscosity-dilution chart

Lube oil filters can be used to remove most contaminants from lube oil. Which of the contaminants listed would  remain in the lube oil after filtering?/Fuel oil

Which of the following conditions could be a cause of  excessive fuel dilution of diesel engine lube oil?/All of the above are correct.

Fuel oil contamination of an auxiliary diesel engine lube oil can result in _____________./lower lube oil pressures

Diesel engine lube oil can become contaminated as a result of _____________./all of the above

Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?/A change in the lube oil viscosity.

The Total Base Number(TBN) value of diesel engine lube oil refers to its ability to _____________./neutralize acids

One simple laboratory analysis of used lube oil that can be carried out aboard ship is called the _____________./blotter test

Which of the listed conditions can be used to determine if lube oil has been diluted by fuel?/Viscosity is lowered.

Lubricating oil viscosity in an operating diesel engine  can be reduced by _____________./dilution by fuel oil

A sudden decrease in the diesel engine lube oil viscosity could be an indication of ____________./excessive fuel dilution

Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?/Leaking standby oil cooler core

Lube oil in the fresh water cooling system of a diesel  engine may result from a _____________./lube oil cooler failure

Which harmful consequence may be the result of lube oil  sludge accumulation?/All of the above

High lube oil temperatures developing in a diesel engine can result from _____________./engine overload

Lubricating oil used in a diesel engine serves to _________./all of the above

One function of diesel engine lubricating oil is to _______./form a friction reducing film between mating surfaces

In a diesel engine, the function of lubrication oil is to provide _____________./all of the above

When fuel oil is accidentally mixed with lube oil which ofthe following processes can be used to separate them?  I. filtering  II. settling/neither I nor II

A diesel engine exposed to widely varying ambient   temperatures should use a lubricating oil with ____________./a high viscosity index

A diesel engine should use which type of lubricating oil?/Detergent oil

The highest indicated lube oil pressure in a diesel engine should be expected when the engine oil is ________./cold at idle

The TBN value of diesel engine lube oil refers to its  ability to _____________./neutralize acids

The color of the diesel engine detergent type lube oil in an operating diesel engine is black, this indicates _____________./normal oil condition

Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?/Inhibitors

Sludge formation in a diesel engine lube oil system is  caused by ____________./All of the above.

Which of the following effects will excessively cold lube oil have on the operation of a diesel engine?/The engine will crank slowly and may fail to start.

In a single-acting diesel engine, the cylinder liner area that is most difficult to lubricate is the ______________./top circumference

NOISE AND VIBRATION

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A dry-type exhaust muffler clogged with soot, will cause _____________./loss of engine power

A loud clicking noise from the valve compartment of an  operating diesel engine would indicate _____________./excessive valve clearance

Which of the diesel engine exhaust mufflers listed is  usually equipped with a spark arrestor?/A dry-type exhaust muffler

Which of the listed characteristics is common to both wet and dry type diesel engine exhaust mufflers?/They function as spark arresters.

Marine diesel engine dry-type mufflers reduce noise by  __________./allowing gases to expand and change direction of flow

Diesel engine mufflers reduce noise by ______________./changing exhaust gas direction

Diesel engine mufflers or silencers reduce the engine  exhaust noise by ________________./reducing the exhaust gas velocity

Diesel engine mufflers accomplish noise reduction by  ______________./reducing exhaust gas velocity

Diesel engine exhaust noise can be reduced in an exhaust muffler by _____________./changing the direction of exhaust gas flow

A loud clicking noise occurring from within the valve  compartment of an operating diesel engine would indicate _____________./excessive valve clearance

PROPLUSION

question/Correct Answer

Main propulsion diesel engines having a bore exceeding 300 mm are to have at least _________./one (explosion relief) valve at the position of each main crank throw

Helical reduction gears, as used with main propulsion drive trains, are constructed so that several teeth are meshed at the same time to ____________./provide smooth continuous power transmission

Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the ___________./engine room control station

Which of the following statements pertains to propulsion engines with bores exceeding 200 mm?/The engines will be fitted with a means to display the  exhaust gas temperature of each cylinder.

A directly connected or geared main propulsion diesel engine should be fitted with a/an ____________./variable speed governor

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the  gears are usually _____________./single reduction

A main propulsion diesel engine is normally shut down by _____________./securing the fuel supply

Which of the following statements is correct concerning  available astern power for diesel main propulsion systems?/Astern power is to be provided in a sufficient amount to secure proper control of the ship in all normal    circumstances.

The purpose of an oil mist detector in a main propulsion diesel engine is to warn of ____________./excessive mist density in the crankcase

Prior to starting, the purpose of turning over a main  propulsion diesel engine with the cylinder test cocks open, is to _____________./remove condensation from the cylinders

Starting a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by ______./heating the engine jacket water

Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in ____________./carbon formation on combustion chamber surfaces

If a single cylinder relief valve on a main propulsion  diesel engine begins to lift, but it is not possible to  secure the engine, which of the following actions should be taken?/Secure or reduce fuel to that cylinder.

The main propulsion diesel continues running after you try to shut down. You should now attempt to _____________./stop the air supply

A water jacket is placed around the exhaust manifoldsof propulsion diesel engines to ________./reduce heat radiation to the engine room

An indication of an overloaded main propulsion diesel engine is _____________./high exhaust gas pyrometer readings

SPEEDS

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Where diesel engine speed and clutch controls are combined into one operation by a single control lever, movement of the lever from the "stop" position to the "ahead" position will FIRST ____________./engage the ahead clutch

To check the setting of the overspeed trip on a diesel  powered generator, you would use a _____________./tachometer

Mist detectors used on large low-speed main propulsion  diesel engines monitor and check for the presence of  ____________./lube oil vapors in the crank case

A large, low-speed, main propulsion diesel engine uses  sea water to directly cool the _____________./scavenging air

The overspeeding of the diesel engine driving an electric generator could cause ______________./damage to windings

In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is  running?/Tie rod

The main function of tie rods in the construction of large, low speed diesel engines is to ____________./accept most of the tensile loading that results from the firing forces developed during operation

Which of the following conditions may need to be reduced when operating a large, low-speed, main propulsion, diesel engine at low loads?/Cooling water flow through aftercoolers

The reversing mechanism on a direct reversing large   low-speed main propulsion diesel engine, operated by means of oil pressure, can serve to _____________./all of the above

A large low speed main propulsion diesel engine may becomeoverloaded by_______________.  I. a heavily fouled hull  II. strong head winds and heavy seas/both I and II

In reducing engine speed to an efficient propeller speed by the use of reduction gears, ____________./speed is reduced and torque is increased

Where one or more diesel driven AC generators are operating in parallel, reducing the value of the speed droop to "zero" on one unit will allow that unit to ____________./change load without changing speed

A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?/3.00 to 1

An individual injection pump is designed for variable  beginning and constant ending of injection. For diesel  engines operating at constant speeds, the start of injection will _____________./advance as the load increases

The control system for a controllable pitch propeller canbe programmed ___________.I. to produce a maximum combined propeller and engineefficiency between pitch and a given engine speedII. for continuous operation of the engine at pre-setconditions/both I and II are correct

If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may suspect a ________./malfunctioning governor

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of ______________./a vibration damper

If an engine operates at 900 RPM at no load, and at 870 RPMat full load, the speed droop is _____________./0.034

If a main propulsion diesel engine hunts excessively at idle speed, you should ____________./adjust the compensating needle valve

When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work ______________./is increased

Immediately after starting a small high-speed diesel engine, you should check the _____________./lube oil pressure

A diesel engine with a full speed of 1000 RPM drives a  propeller at 300 RPM. What is the speed reduction ratio?/3.33 to 1

Precombustion chambers, air cells, and energy cells in high- speed, small bore diesel engines all serve to increase  _____________./turbulence

Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed. In most reduction gears, the bull gear ____________./is connected to the propeller shaft

When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance (loosely fitted) bolts in other locations. This is done to _____________./permit the engine to expand away from the driven equipment as the engine heats up and expands

In using reduction gears to obtain efficient propeller  speeds, ____________./they are connected to the engine with a flexible coupling

Critical speed in diesel engines occurs when engine torque pulsations become _____________./resonant with the crankshaft natural frequency

Which of the types of reduction gearing listed is best  suited for medium speed main propulsion units?/Helical

In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the ____________./fuel must be preheated

The device used to limit engine torque at various engine speeds is called a ______________./load limiting governor

What type of reduction gear would most commonly be used with twin medium-speed propulsion diesel engines driving a single shaft?/Single reduction, double input

Which of the equal horsepower diesel engines listed, running at the same speed, is least affected by exhaust back  pressure?/A four-stroke/cycle "V" type engine

What is the best way of stopping an overspeeding diesel  engine?/Secure the fuel supply and block the air intake

The overspeed trip installed on most diesel engines willstop the engine by shutting off the ____________./fuel oil supply

To shut down a diesel engine after it exceeds the set  maximum speed, which type of device listed should be used?/Overspeed trip

An overspeed trip serves to _____________./stop the engine by closing the air intake

An overspeed trip stops a diesel engine when the engine  _____________./exceeds a set maximum speed

The flywheel reduces speed fluctuations by _____________./storing kinetic energy

The overspeed trip device installed in some diesel engines is automatically actuated by _____________./centrifugal force

For most diesel propulsion and generator engines, the  overspeed trip device will stop the engine by ____________./shutting off the fuel supply

In a large slow-speed propulsion diesel engine, the force applied to the crosshead is ______________./against the crosshead during the power and compression  strokes

A seven cylinder, 2-stroke/cycle, single acting diesel  engine has a 750 mm bore and a 2000 mm stroke. What  indicated power will be developed if the average mean  effective pressure is 14.8 kg/cm2 at a speed of 96 RPM?/14,363 kW

A six cylinder 2-stroke/cycle, single acting diesel engine has a 580 mm bore and a 1700 mm stroke. What indicated  power per cylinder will be developed if the average mean effective pressure is 15.3 kg/cm2 at a speed of 120 RPM?/1,348 kW

Which of the listed types of superchargers will NOT have a volumetric capacity proportional to engine speed?/Exhaust gas turbocharger

Which of the terms listed below represents the operational speed at which excessive engine vibration is created?/Critical speed.

Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _____________./detuner or viscous fluid damper

A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a ____________./high alkaline reserve

As engine RPM is increased from idle speed to full load  speed, which of the conditions listed will decrease?/Fuel/Air ratio

A diesel engine is turned at normal cranking speed, but  fails to fire. This can occur from _____________./air in the fuel injection system

Prior to starting most medium-speed propulsion diesel  engines, which of the procedures listed should be observed?/The engine should be turned over slowly with the indicator cocks open.

When attempting to restart a warm high-speed engine, which of the following reactions can you expect?/Higher than normal temperatures for start up

If a diesel engine starts firing, but is unable to come up to normal speed, either without load or even under a small load, the cause may be ______________./all of the above may cause this problem

While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?/Interrupt the fuel flow to the engine.

The power developed by a large slow-speed main propulsion diesel engine is dependent upon the ______________./all of the above

During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the  following actions is used to stop the shaft from turning prior to reversing the engine rotation?/Admission of starting air

A ship is propelled by a direct reversing large, slow-speed, diesel engine. One step in reversing the direction of propeller rotation for this vessel is by ______________./reversing the servomotor

Before shutting off the fuel supply to stop a medium or  high-speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?/To prevent internal damage from local overheating.

When running a large, low-speed, main propulsion diesel  engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?/The temperature of the fuel from the preheater should be gradually reduced after switching over the three-way valve.

Starting a large low-speed propulsion diesel engine on  diesel fuel during cold weather conditions, will be made easier by _____________./heating the engine coolant

Starting systems for large, low-speed, direct reversing, main propulsion diesel engines are usually _____________./direct air admission

Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion  diesel engines?/Air

When an engine fitted with a hydraulic starting system  starts up, the starter is protected from the higher speed of the engine by _____________./the overrunning clutch

Which of the conditions listed could cause the cylinder  relief valves on a large, low-speed, propulsion diesel  engine to lift?/Excessive fuel injection

The most practical way of detecting an overload in one  cylinder of an operating large, low-speed, main propulsion diesel engine is to _____________./check the cylinder exhaust temperature frequently

A diesel engine experiences a sudden loss in speed,accompanied by black exhaust smoke, with the fuel rack atmaximum, and the speed remaining below normal. The probablecause is ____________./engine overload

A large low-speed main propulsion engine must be operated with one cylinder secured. When the engine was stopped, the affected cylinder ended in a position preventing the engine from being restarted. Which of the following actions should be taken to corre/Admit starting air in the direction opposite to the desired direction, then restart in the desired direction.

If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its ____________./cylinder oil feed rate should be reduced

Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one  cylinder secured?/Engine speed should be reduced.

If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or _____________./inadequate fuel injection

Irregular engine speed in a diesel generator can be caused by _____________./binding in the fuel control linkage

When attempting to start a main propulsion diesel engine, the engine turns at the proper speed but will not start. You should check the _____________./overspeed trip

If while attempting to start a diesel engine, the cranking speed is too low, _____________./the heat of compression will be insufficient to ignite the fuel

A large, low-speed, main propulsion diesel engine exhaust is designed to drain off ___________./condensed water vapor produced from the exhaust gases

What could be the cause of inadequate starting speed during the cranking of a cold diesel engine?/High lube oil viscosity

High-speed, multi-cylinder, diesel engines commonly use  counterweights placed opposite to the crankpins to ________./provide dynamic balance by equalizing centrifugal force

STARTING  AIR

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What preventative maintenance should be done frequently to diesel engine starting air receivers?/Drain the accumulated moisture.

The total starting air capacity required for reversible main engines is to be sufficient for a least __________./twelve consecutive starts

Two air compressors are provided for the starting air  system and should be capable of ______./charging the starting air containers within one hour

Air receivers installed in starting air systems are to be ________./so installed as to make the drain connections effective  under extreme conditions of trim

Each receiver in a starting air system which can be isolated from a relief valve _______________./is to be provided with a suitable fusible plug to relieve the pressure in case of fire

Vessels having main engines arranged for air starting are to be provided with at least _________./two air starting containers of approximately equal size

Improper seating of an air starting check valve in an  operating diesel engine is indicated by _____________./an overheated air supply pipe to the cylinder head

If control air systems are supplied from starting air  receivers, the capacity of the receivers should be   sufficient _________./for continued operation of these systems after capacity for the required number of consecutive starts has been used

A pilot-operated, main air starting valve begins leaking in one cylinder while the engine is operating. This   malfunction is indicated by ____________./an overheated air supply line to that cylinder

What may be used to protect starting air mains against  explosions arising from improperly functioning starting  valves?/An isolation non-return valve is to be installed at the  starting air supply connection to each engine.

In an operating diesel engine, which of the following  conditions is an indication of a leaking air starting valve?/Overheated starting air pipe to the cylinder head.

On a diesel engine, using a distributer type air startingsystem, that is not running, which of the following methodsmay be used to detect leaking air starting valves?/Open the cylinder test cocks and check for blowing air.

An air starting motor for a diesel engine is protected from overspeeding by _____________./an overrunning clutch

In addition to a main engine driven starting air compressor, another air compressor, driven by a separate power source, is installed to _____________./supply a backup source of starting air

The starting air supply for a diesel engine is generally produced by a/an _____________./multistage reciprocating air compressor

Where is the charge for an air starting system stored?/Pressurized tank

Intercoolers installed on starting air compressors, reduce the possibility of ________________./lube oil carbonization

A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal   displacement, because the two-stroke/cycle diesel engine _____________./operates without energy absorbing intake and exhaust strokes

Cams used to activate mechanically operated air starting valves on four-stroke/cycle diesel engines should have which of the valve lift profiles listed?/Abrupt lift giving full valve opening for a long period, with gradual valve seating.

The timing of diesel engine air starting valves is   controlled by _____________./individual cams and valve gear

Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?/Opening the starting air valve quickly

Starting air valves are held firmly on their seats by  ____________./spring force

A six-cylinder, four-stroke/cycle diesel engine is fitted with a rotary distributor type air starting system. The speed of the rotating distributor disc is _____________./one-half engine speed

A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting system. The speed of the rotating distributor disc is ____________./the same as engine speed

When the quick acting valve to admit starting air to an air start motor is activated, the valve should be opened rapidly to ____________./ensure proper operation of the Bendix pinion

When an air started, four-stroke/cycle diesel engine is  being cranked, the starting air is admitted to each cylinder during what would normally be the _____________./power stroke

In a medium-speed marine propulsion engine equipped with direct air starting valves, the cylinders without air  starting valves fire first because the ____________./cylinders are not chilled by the expansion of the starting air

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air youmust ____________./reposition the fuel injection cam

Which of the routine maintenance procedures listed is  required for starting air receivers?/Frequent draining of accumulated moisture.

Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?/Corrosion and eventual failure of the tank.

The starting air rotates a diesel engine at the proper  speed, but the engine fails to start. You should check  _____________./all of the above

On a diesel engine with direct-cylinder admission air  starting, a leaking air starting valve would be indicated by _____________./an overheated starting air supply pipe

When starting air is admitted, a diesel engine turns over very slowly without firing. The cause may be ______________./low starting air pressure

TURBOCHARGING

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On a turbocharged, medium-speed, diesel engine, which of the following problems is an indication of a restricted air  intake passage?/engine is hard to start

If over a period of weeks the air-box pressure of a   turbocharged, diesel engine, operating at full load, appears to be dropping off, the cause can be _____________./gradual fouling of the air filters

The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is  interrupted because the _____________./air charge density decreases

The exhaust system for a turbocharged diesel engine   functions to _____________./power the turbocharger

Which of the following conditions is realized by the  turbocharging of a previously naturally aspirated diesel engine?/Mechanical efficiency increases.

If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will _____________./increase as the load increases

A diesel generator has just been paralleled with an AC  turbogenerator, but the load can not be properly divided. This could be caused by _____________./an incorrect diesel generator governor speed droop   adjustment

Which of the turbocharging systems listed operates with the least average back pressure in the exhaust manifold?/Pulse pressure

An operating turbocharged diesel engine that suddenly loses power,  is due to a/an _____________./restricted turbocharger air intake

Which of the turbocharging methods listed directs the  exhaust gases to the turbine at fairly uniform velocity and pressure?/Constant pressure

Intake air flow from a diesel engine turbocharger is  directly proportional to engine __________./load

One characteristic of a pulse type turbocharging system is _____________./multiple exhaust pipes to the turbocharger

Which of the following turbocharging systems channels the exhaust gases of each individual cylinder directly into the turbine rotor blades?/Pulse

The relative air pressure in the inlet manifold of a  turbocharged diesel engine is usually _____________./greater than the average exhaust manifold pressure

A turbocharged diesel engine will have an intake manifold pressure _____________./constantly increasing as the amount of supercharging  increases

The function of the aftercooler installed between the  turbocharger and intake manifold on some diesel engines, is to _____________./increase the density of the intake air

Aftercooling of a turbocharged diesel engine will result in _____________./higher torque and higher brake horsepower

When used in conjunction with a turbocharger, the main  function of an aftercooler is to ___________./increase the density of the cylinder air charge

Performance of a turbocharged engine can be improved by  _____________./aftercooling the intake air

The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an ______________./aftercooler

An aftercooler installed between the turbocharger and the cylinder air inlet _____________./increases the density of the air

If cooling water flow through the aftercooler is   interrupted, the power output of a turbocharged diesel  engine will drop because the _____________./density of the air charge will decrease

An increase in the load on a turbocharged diesel engine  operating at constant speed will result in an increase in _____________./all of the above

The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the __________./diffuser passages

When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will _____________./lag behind the increased fuel supplied to the engine

In a turbocharger, inlet air velocity is increased in the _____________./rotating impeller vanes

While maneuvering, you discover heavy smoke coming from the turbocharger casing, you should ____________./notify the bridge that you are going to shut the engine down

Which of the following conditions would require the removal of a turbocharger for repair?/All of the above

Which of the following precautions should be taken when  cleaning the air filter on a diesel engine equipped with a turbocharger?/Cover the air inlet after removing the filter.

Which of the following conditions may contribute to the  formation of deposits on the blades of the turbocharger  turbine?/All of the above.

Following the failure of one turbocharger on a large,  crosshead, main propulsion diesel engine, fitted with  multiple turbochargers, which of the following actions  should be taken prior to further operation of the engine?/All of the above.

Which condition indicates the air side fouling of an  aftercooler on a turbocharged diesel engine?/A decrease in the air temperature differential between the cooler inlet and outlet.

Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?/Clogged air intake filters.

Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a  turbocharged and aftercooled diesel engine?/Insufficient cooling water flow

If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?/All of the above.

A sudden power loss from a turbocharged and aftercooled  diesel engine is an indication of a/an ______________./turbocharger malfunction or failure

Corrosion and grooving on the blading of an exhaust driven turbocharger is caused by certain components of residual fuel oils. These components are vanadium, sodium, and  ________________./sulfur

Leaking oil seals on a diesel engine turbocharger can cause _____________./all of the above

A turbocharged and aftercooled diesel engine can overspeed due to _____________./oil leaking into the turbocharger compressor end

Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?/All of the above

Why will a turbocharged diesel engine produce black smoke if excessive additional load is applied too quickly?/The inertia of the turbocharger rotor causes a time lag  which delays the turbocharger speed increase.

Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in ________________./all of the above

In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the _____________./load on the engine

The operating speed of a turbocharger is directly dependent upon _____________./engine load

At rated engine load and RPM, the diesel engine turbocharger is powered by _____________./exhaust gases

If the speed of a turbocharged diesel engine is maintained constant as the load on the engine is increased, the speed of the turbocharger will _____________./increase

An increase in power output of a turbocharged diesel  engine operating at a constant engine speed results in  _____________./All of the above are correct.

If you observe smoke coming from the turbocharger of an  auxiliary diesel engine, you should ______________./secure the engine

In a multi-cylinder, constant pressure, turbocharged diesel engine, the combined exhaust temperature at the turbocharger inlet reads higher than the individual cylinder exhausts. This means the _____________./combined exhaust pyrometer is reading normally

Directional intake ports in diesel engines are used to  _____________./induce air swirl

A naturally aspirated diesel engine at full throttle will have an intake manifold pressure ____________./slightly less than atmospheric pressure

The intake valves in a diesel engine are reseated by  _____________./valve springs

Cooling the intake air supplied to a diesel engine will  _____________./increase power output

A restricted air intake to a diesel engine may result in the engine _____________./failing to reach rated speed

An indication of a diesel engine air intake being partially clogged, is ____________./low firing pressure and normal exhaust temperatures

Which of the air intake systems listed will result in the lowest specific fuel consumption?/Turbocharged

The intake air ducting to a diesel engine should not draw from an area on deck where flammable vapors released from tanks are present, because ____________./the engine may overspeed and the normal governor or   overspeed trip will not be able to secure the engine

Broken intake valve springs on one cylinder of a diesel  engine can cause the engine to _____________./fire improperly

In diesel engines, the four basic events (intake,   compression, power and exhaust) are performed once in  _______________./two piston strokes in a two-stroke/cycle engine

In diesel engines, the four basic events (intake,   compression, power, and exhaust) are performed once in  ______________./one complete crankshaft revolution in a two-stroke/cycle engine

Worn diesel engine intake valve guides can result in  _____________./excessive lube oil consumption

Higher than normal temperature air passing through the  intake of a diesel engine will result in _____________./lower horsepower

What is the function of the aftercoolers installed in the diesel engine air intake system?/Increase the air density

Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an _______________./jacket water heater

TWO STROKE CYCLES

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In a two-stroke/cycle diesel engine, the process   of scavenging begins as the ________./early part of the upstroke

When accumulated carbon at the air inlet ports of a   two-stroke/cycle diesel engine is being removed, you should take care to avoid carbon _____________./entering the cylinder

The speed of the camshaft in a two-stroke/cycle diesel  engine, running at 950 RPM, is _____________./950 RPM

In a two-stroke/cycle diesel engine, the camshaft rotates at _____________./the same speed as the crankshaft

Large, two-stroke/cycle, main propulsion, diesel engine  cylinders can be successfully pressure charged during normal operation, by using the ___________./constant or pulse pressure system

A two stroke diesel engine exhaust temperaturewill be lower than a four stroke diesel engine of the same displacement because the ___________.  I. scavenging air is cooling the exhaust gases  II. exhaust cycle time is longer/I only

In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the _____________./starting air and fuel pumps

What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?/90°

Which of the listed design features is most common to a  two-stroke/cycle low-speed main propulsion diesel engines?/Crosshead construction

The average exhaust temperature of a two-stroke/cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke/cycle diesel engine at equal loads  because ____________./two-stroke/cycle diesel engines have a lower M.E.P. than four-stroke/cycle diesel engines

Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?/Exhaust and scavenging

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel  engine because ____________./it develops twice as many power strokes at the same speed

The two strokes of a two-stroke/cycle diesel engine are  ____________./compression and power

When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?/All of the above

How many power strokes per crankshaft revolution are there in an eight cylinder, two-stroke/cycle diesel engine?/Eight

In order to keep excess oil from the intake ports in  two-stroke/cycle diesel engines, ______________./oil rings are located near the bottom of the piston skirt

Turbulence in the cylinder of a two-stroke/cycle main  propulsion diesel engine is mainly created by _____________./intake port design

In a single acting, two-stroke/cycle, diesel generator  engine, the power impulse in an individual cylinder occurs ____________./once every crankshaft revolution

A six cylinder, two stroke/cycle diesel engine is 83%  efficient and has a cylinder constant of 0.998 while  operating with a mean effective pressure of 15 kg/cm2 at a speed of 100 RPM. What is the metric brake horse power developed?/7,455 kW

What is the metric brake horse power developed per cylinder by an 83% efficient, six cylinder, two-stroke/cycle diesel engine with a cylinder constant of 0.998 and a mean   effective pressure of 15 kg/cm2 at 100 RPM?/1,242 kW

What is the swept volume per cylinder per revolution of a six-cylinder, two-stroke/cycle diesel engine with a 580 mm bore and a 1700 mm stroke operating at 100 RPM?/0.90 cubic meters (900 L)

A seven cylinder, two-stroke/cycle, single acting diesel engine with a cylinder indicated horsepower calculated as 1350 kW and brake horsepower measured at 7466 kW has a  mechanical efficiency of ______________./0.79

The process of scavenging a two-stroke/cycle diesel engine serves to _____________./cool the exhaust valves

When accumulated carbon at the air inlet ports of a   two-stroke/cycle diesel engine is being removed, you should take care to avoid carbon particals _____________./entering the cylinder

Which of the Roots blower rotors listed below, will supply air to a two-stroke/cycle, medium-speed, diesel engine with the least amount of turbulence and pulsation?/Three-helical lobes

If a two-stroke/cycle diesel engine is overspeeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?/Shut off the fuel supply and block the flow of intake air.

The pilot valves in an air pilot starting system for a  two-stroke/cycle, direct-reversing, main propulsion diesel engine are operated by either a ported distributor disc or a/an _____________./individual cam for each pilot valve

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by ______________./scavenging air

In the cylinder head of a two-stroke/cycle diesel engine, valves are used for _____________./exhausting combustion gas

The exhaust system for a turbocharged two-stroke/cycle  diesel engine functions to _____________./all of the above

An eight cylinder, air started, two-stroke/cycle direct  reversing, marine diesel engine can be started from any  crankshaft position only if it has ____________./at least three cylinders equipped with air start valves

In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the ______________./pressure of the fresh air charge

The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by __________./pressure of the fresh air charge

The intake ports of a two-stroke/cycle diesel engine are opened and closed by the action of the _____________./piston movement

Exhaust gases in a two-stroke/cycle diesel engine are  discharged through _____________./exhaust ports or valves

A turbocharged, eight cylinder, two-stroke/cycle diesel  engine has a swept volume of 5160.31 cubic inches, a 9 1/16 inch bore, 10 inch stroke, and a compression ratio of  14.5:1. If during an overhaul, the cylinder heads have to be trued by milling off ./5160.31 cubic inches; 14.95:1

If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle  diesel engine will develop approximately _____________./twice the indicated horsepower as a four-stroke/cycle engine

Compared to four-stroke/cycle engines, two-stroke/cycle  diesel engines have the disadvantage of _____________./higher cylinder head temperatures

A disadvantage of a two-stroke/cycle diesel engine is  ___________./higher working temperatures of the piston and cylinder

In a single acting, two-stroke/cycle, diesel engine, the power impulse in an individual cylinder occurs ____________./once every crankshaft revolution

Excessive exhaust temperatures in a two-stroke/cycle dieselengine can be caused by a/an ____________./carbon build up in the exhaust ports

A two-stroke/cycle diesel engine operates erratically,  overspeeds, and fails to restart when cranked at normalspeed. Which of the following problems is the most likelycause for the engine failing to restart?/Failure to reset the overspeed trip

What color exhaust will be exhibited when a slow speed  two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on   insufficiently preheated heavy fuel oil?/Black

VIBRATION

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To prevent vibration damage to the fuel supply line of a diesel engine, you may use ____________./a length of approved flexible nonmetallic hose

A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional   vibrations in the _____________./crankshaft

Which of the terms listed below represents the operational speed at which excessive engine vibration is created?/Critical speed.

Vibrations from diesel engines and engine driven equipment are isolated from the hull structure by _____________./flexible engine mountings

The large number of mechanical and pulsating vibrations  developed in a diesel engine may damage an attached   _____________./gas driven turbocharger because it has a wide speed range and high temperature materials that are subject to resonant vibration

Excessive vibration in an operating diesel generator may be caused by _____________./loose engine mounting bolts

PISTON

Question/Correct Answer

The piston rod scraper box incorporated in a two-stroke/cycle, crosshead diesel engine serves to  _____________./prevent sludge and dirty oil from entering the crankcase

Trunk-type diesel engine pistons are most effectively cooled by heat _____________./conducted to water cooled cylinder walls

Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent __________./contamination of the lube oil by water

For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ____________./oil spray

Oil for piston cooling is delivered through the connecting rod to a compartment in the piston head, then    distributed as a result of piston motion, and finally  drained to the crankcase through one or more holes or pipes. This procedure is known as the /shaker method

The method of piston cooling in which oil is delivered  through the connecting rod to a compartment within the  piston, then distributed by the motion of the pistons, and allowed to drain to the crankcase via one or more holes or pipes, is termed ________/shaker

For any piston ring to operate smoothly without scuffing, the ring must be _____________./properly lubricated

The upper piston rings in large, slow-speed, two-stroke/ cycle diesel engines are most effectively lubricated by oil _____________./fed from mechanical lubricators

The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, propeller shafts, and generators by the _____________./crankshaft

The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the _________./connecting or piston rod

The small end of the connecting rod is attached to the  piston with a _____________./wrist pin

In a diesel engine, pistons are attached to the crankshaft by _____________./connecting rods

In diesel engines designed with a crosshead, the motion of the piston rod can be described as _____________./straight reciprocation

Which of the following design features will reduce the  possibility of overheating the top compression rings of a cast iron piston?/A heat dam design is sometimes used in the piston head.

The purpose of a heat dam used in some diesel engine cast iron pistons is to ____________./increase the distance of travel for heat from the crown to the top ring groove

Cast iron pistons used in large propulsion diesel engines are constructed with ____________./the crown being tapered and smaller than the skirt

The upper section of a piston is called the _____________./crown

Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?/To allow for greater expansion due to higher operating  temperature.

In a diesel engine, excessive cylinder liner wear willcause ___________.I. increased blowbyII. wear between the piston ring and groove/both I and II are correct

The diameter of a piston is usually less at the crown than at the skirt, in order to ______________./allow for the expansion of the piston during operation

What occurs in the combustion space of a diesel engine  cylinder shortly after ignition and before the piston  reaches TDC?/Rapid increase in pressure and temperature.

An advantage of aluminum pistons, when compared to cast iron pistons is _____________./better heat conductivity

If the piston stroke in a diesel engine is 10 1/2 inches and the speed of rotation of the crankshaft is 720 RPM, what is the average piston speed?/1260 feet/minute

Insufficient piston cooling for a large, low-speed, main propulsion diesel engine burning heavy fuels, can result in _____________./high temperature corrosion and burning off of piston crown metal

A piston in a four-stroke/cycle diesel engine makes four strokes during each __________./mechanical cycle of operation

The lower section of a piston is called the _____________./skirt

The piston wrist pin used in some diesel engine pistons is prevented from contacting the cylinder wall by a __________./snap ring

Piston cooling fins are located _____________./underneath the piston crown

Besides the use of piston cooling fins to assist in cooling,they also provide extra strength for the piston ___________./crown

Trunk type diesel engine pistons are effectively cooled when heat is ____________./transferred to water cooled cylinder walls

A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an _______________./opposed pistons engine

A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston/Length of the piston skirt

One of the most common methods in preventing a diesel engine piston pin from contacting the cylinder wall is by the use of ____________./snap rings

In a large slow-speed propulsion diesel engine, the force applied to the piston is ______________./against the crosshead during the power and compression  strokes

During the power stroke, the side thrust of a trunk type piston is a result of the angle ____________./formed by the connecting rod and the cylinder center line

Ring groove inserts are occasionally used on aluminum alloy pistons to ____________./reduce the ring groove wear rate

Increasing the oil pressure acting on the power piston of the hydraulic governor shown in the illustration will  ____________. (See illustration MO-0092)/increase the governor output power

Thin bronze rings are inserted in the face of some chromium plated piston rings to _____________./promote piston ring seating in the cylinder

Which of the construction techniques listed is used on new piston rings to facilitate run-in or seating?/Special ring facings, such as a thin bearing surface of  antifriction metal.

A diesel engine piston ring face is in direct contact with the _____________./cylinder liner oil film

The function of diesel engine piston compression rings is to ____________./transmit heat from the piston to the cylinder liner

A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to ____________./all of the above

The main reason for using bimetallic piston rings is to  ______________./reduce the probability of ring fracture

In a diesel engine, internal combustion causes the piston to be moved by _____________./the pressure of gases developed

A secondary function of diesel engine piston rings is to _____________./prevent excess lubricant from reaching the combustion space

Diesel engine piston ring gaps can be straight or angle cut. In comparison, the angle cut ring ____________./decreases combustion gas leakage

The most rapid period of fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and ____________./should be completed shortly after passing top dead center

The sealing surfaces of a diesel engine piston ring are  considered to be the faces in contact with the cylinder  wall, in addition to the ring groove ___________./bottom

The reason some two-stroke/cycle, diesel engine piston rings are pinned to prevent rotation, is _____________./to keep the ring ends from catching in the scavenging ports

What is the average piston speed of a five cylinder low- speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated speed of 123 RPM?/1291 ft/min (393 m/min)

The main purpose of the piston oil scraper rings is to  _____________./reduce the amount of lube oil burned in the combustion  chamber

The primary purpose of oil control rings on a diesel engine piston is to _____________./prevent excessive lubricating oil consumption

Opposed piston diesel engines are classified as __________./two-stroke/cycle single acting

Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to _____________./keep excess oil away from intake and exhaust ports

To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also _____________./prevent excessive lubrication from reaching the combustion space

What is the average piston speed of an engine with a 12 inch stroke, operating at 900 RPM?/1800 ft/min

The firing order of an in-line, four-stroke/cycle, six  cylinder, auxiliary diesel engine is 1-5-3-6-2-4. When the #1 cylinder is firing at top dead center, the #3 piston is ____________./on the intake stroke

Slots are provided in a diesel engine piston oil scraper ring to _____________./permit drainage of excess oil to the engine sump

The function of the piston compression rings used in a  diesel engine is to _____________./all of the above

Which of the listed devices could be used as a substitute for a ring grooving tool used to remove hard carbon deposits from piston ring grooves in preparation for installing new rings?/A section of the removed compression ring

The main function of piston compression rings is to _______./seal the space between the piston and the liner

Piston compression rings used in a diesel engine function to _____________./seal the combustion space from the crankcase

Which of the following statements represents the function of the compression rings installed at the top of a diesel  engine piston?/Transmit heat from the piston to the cylinder liner.

If the oil control rings were installed upside down on a diesel engine piston, which of the following conditions  would result?/Excessive oil pumping would occur.

During which of the listed piston strokes of a    four-stroke/cycle diesel engine, is the piston moving  downward?/Intake stroke

Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by _____________./compression rings

The side clearance of the compression rings on diesel engine pistons is necessary to _____________./permit gas pressure behind and on top of the rings

In an internal combustion engine, which of the devices  listed will force the compression rings to seal the   compression gases in the space above the piston?/Gas pressure acting against the back of the ring

The purpose of piston ring end clearance is to ____________./prevent buckling and breaking of the ring

Excessive piston ring wear in a diesel engine will cause _____________./increased lube oil consumption

Sticking of diesel engine piston compression rings may be caused by _____________./excessive cylinder lubrication

In a diesel engine, when refitting piston rings you should__________.  I. check the ring gap at the smallest diameter of     the cylinder  II. remove carbon from the ring groove/both I and II

If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will _____________./develop less power under load

A condition contributing to diesel engine piston rings  sticking in the ring grooves, is insufficient ring clearance at the ring ____________.                       I. gap  II. side/II only

In a trunk type diesel engine piston, the thickness of the head or crown is determined by the ___________.  I. strength requirement  II. heat dissipation requirement/both I and II

In a diesel engine, when installing new piston rings it is important to check _____________.  I. ring gap clearance  II. side clearance/both I and II

In a diesel engine, the contact surfaces of the piston compression rings are those in contact with the___________.  I. back of the ring groove  II. bottom of the ring groove/II only

Excessive piston ring wear in a diesel engine will cause _____________./abnormal lube oil consumption

In a medium speed diesel engine, a trunk type piston may be cooled by ____________.I. oil circulation though passages in the piston crownII. heat transfer through piston rings and liner wall/either I or II

What is the average piston speed of a seven-cylinder,  two-stroke/cycle diesel engine with a 580 mm bore and a 1700 mm stroke operating at 100 RPM?/5.7 m/sec

A piston is said to be at top dead center when it is ______./nearest to the cylinder head

In a large low-speed diesel engine excessive pistonclearance can be restored by ____________./inserting shims between the crankpin bearing box and the connecting rod foot

After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the  cylinder liner. This ridge must be removed when piston  rings are renewed in order to prevent ______________./breaking of the top ring, ring land, or both

A diesel engine piston crown can crack from ____________./all of the above

In a diesel engine, pistons are attached to the crankshaft by _____________./connecting rods

One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the ____________./cylinder head

In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move _________________./up and force out the exhaust gases

During the diesel engine power stroke, the side thrust of a trunk type piston is a result of the angle _____________./formed by the connecting rod and cylinder center line

The most rapid period of fuel combustion occurring in a  diesel cylinder should begin just before the piston reaches top dead center and ______________./should be completed after top dead center

The pressure in an operating diesel engine cylinder   continues to rise for a short period after the piston passes top dead center as a result of the _______________________./expansion of the combustion gases

Which of the following characteristics of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?/Low carbon forming tendencies

Which of the following conditions would cause carbon  deposits to form in the piston ring belt of a diesel engine?/All of the above

Insufficient end clearance on newly fitted piston rings in a diesel engine will cause the rings to ______________./jam in the least worn part of the cylinder when the rings expand

If the piston ring gap remains insufficient when installing new rings, you should ___________./file the ends of the rings

When installing rings on a diesel engine piston, you should check the ring _____________./gap clearance

You are installing new piston rings on a single acting  diesel engine piston. To check the ring gap clearance, the rings should be placed at the ____________./point of minimum cylinder wear

When a diesel engine is operated with a piston ring having a cold gap clearance less than that recommended by the  manufacturer, the ring will ____________./seize and buckle

Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?/All of the above

A visual inspection of the chrome plated piston compression rings at the liner ports reveals vertical brown streaks on the face of the rings. This condition indicates __________./ring blow-by

An examination of the piston compression rings of an  efficiently operating diesel engine, should appear with a ___________./shiny face and bottom, black back and top

Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner ports. This condition indicates a ring which   ________________./has excessive blow-by

When inspecting piston rings through the ports of a   two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of ______________./blow-by

Black areas on the sealing surfaces of piston rings indicate _____________./passage of hot gases

If sludge accumulates on the underside of a diesel engine piston, it will ______________./raise the piston temperature

Which of the conditions listed occurring in a diesel engine would cause carbon deposits to develop in the piston ring belt?/All of the above.

Failure to remove the carbon ridge at the top of the cylinder when removing a piston may result in ___________./damaged upper piston rings and/or ring lands

The best tool to use for removing the carbon ridge at the top of an engine cylinder, prior to removing the piston, is to use ____________./a metal scraper

To facilitate early ring seating of newly installed piston rings, while still providing extended ring wear, __________./a taper faced ring can be used

Which of the following statements is true regarding the  installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?/Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports.

The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by ____________./knurling the piston skirt surface

If a diesel engine has been stopped because of piston  seizure due to severe overheating, the crankcase   _____________./inspection covers should not be opened until the engine has cooled

Which of the following conditions can result in the cracking of the piston lands?/Insufficient ring groove clearance

Excessive side clearance between a piston ring and its  groove will cause the ring to ______________./hammer the piston land below the ring

If the back clearance of a piston ring is excessive,  _____________./carbon will accumulate behind the ring

Fluid type starting motors used for starting auxiliary  diesel engines may either be of the piston type or the  _____________./vane type

In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessive. In order to correct for this, you should ______________./insert shims between the crankpin bearing box and the  connecting rod foot

Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will _____________./decrease engine power

In a four-stroke/cycle diesel engine, piston blow-by can result in increased _____________./crankcase pressure

Diesel engine piston ring blow-by is usually caused by  excessive ring clearance at the ring ____________./gap

One cause of diesel engine piston ring blow-by is _________./excessive lubrication

In large, low-speed, main propulsion diesel engines, piston ring groove wear usually occurs at the _____________./bottom of the ring groove

The ring lands on a large, low-speed, main propulsion diesel engine piston may crack due to _____________./insufficient ring groove clearance

In an auxiliary diesel engine, the reason for knurling the piston skirt is to __________./improve skirt lubrication

Cracking of a diesel piston crown can result from ____________./all of the above

If clearance between a piston and the cylinder wall is  excessive, piston slap will occur. The slap itself is  caused by ______________./alternation of side thrust

To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorter. This  results in _____________./slightly greater piston wear

Piston cooling fins are located _____________./beneath the piston crown

If the oil scraper ring drain hole in a diesel engine  piston becomes plugged, _____________./oil consumption will increase

Many cast iron pistons are designed with heat dams, which serve to _____________./reduce the possibility of overheating the top compression ring

If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?/Excessive oil will remain on the cylinder wall.

If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to   ______________./excessive ring temperature

Cold clearances between the skirt of an aluminum piston and the cylinder liner is about ______________./twice as large as with a cast iron piston

Improperly fitted piston rings in a diesel engine can cause _____________./excessive lube oil consumption

Diesel engine piston seizure can be caused by _________./all of the above

Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of _____________./residual carbon deposits

In a two-stroke/cycle, opposed piston, diesel engine, one crankshaft operates several crank angles in advance of the other crankshaft to _____________./allow the exhaust ports to open and close before the inlet ports close

The difference in crank lead between the upper and lower cranks of an opposed piston engine causes the lower   crankshaft to ____________./receive more power than the upper shaft

In an opposed piston engine, which of the following events would happen if the lower crank lead were reduced from 12‚ to 0‚?/The exhaust and scavenging ports would open simultaneously.

During the power stroke of a four-stroke/cycle diesel  engine, most of the side thrust of a trunk-type piston is absorbed by the _____________./piston skirt

The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?/Low compression pressure and high exhaust temperature

If a four-stroke/cycle diesel engine is started by injecting air into the cylinders, the pistons receiving the charge of starting air must be _____________./on the power stroke

Which of the listed conditions can cause lacquer to be  deposited on a piston skirt?/High lube oil temperatures

In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the cylinder _____________./volume

When a piston is removed from a diesel engine for   maintenance, the piston should be examined for ___________./all of the above

Failure to remove the carbon ridge from the top of the  cylinder when replacing the piston rings, will result in ____________./damaged upper piston rings and/or ring lands

A condition contributing to diesel engine piston rings  sticking in the ring grooves, is insufficient ring clearance at the ring ____________./side

In an opposed piston engine, the term "crank lead" refers to _____________./the piston in one cylinder reaching inner dead center  several crankshaft degrees before the other piston

In the operating cycle of a four-stroke/cycle diesel engine, blowdown to exhaust manifold pressure must occur before the piston begins the exhaust stroke to avoid _____________./pumping losses

The cubic inch (or liter) displacement of a cylinder is  determined by the diameter of the piston and the   _____________./length of the stroke

During the compression stroke in a four-stroke/cycle,  diesel engine, assume that the piston can only travel  seven-eighths of the total distance between BDC to the  underside of the cylinder head. Which of the following  ratios will be the compression ra/8 to 1

The average pressure exerted on a piston during each power stroke is termed _____________./mean effective pressure

(Piston area) X (Piston stroke) X (numbers of the cylinders) = engine _____________./displacement

Engine displacement is equal to piston _____________./area times the piston stroke times the number of cylinders

A piston is at bottom dead center when it is ____________./farthest from the cylinder head

A piston is said to be at top dead center when it is  _______________./nearest to the cylinder head

Many diesel engines have pistons with concave heads to  _____________./increase air turbulence and improve fuel mixing

Which of the following types of engines have a combustion chamber located between a cylinder head and the crown of a piston?/Single acting

A four-stroke/cycle six cylinder in-line diesel engine has a firing order of 153624. When cylinder #6 is firing at top dead center, piston #4 is ____________./on the intake stroke

When inspecting pistons, liners, and rings of a large  two-stroke/cycle diesel engine through the cylinder ports, a wet piston crown would indicate a ____________./leaky fuel injector

Which of the events listed does NOT occur during the instant the piston just reaches top dead center?/Intake

After removing an old set of rings, which of the following conditions is indicated if a bright spot is found on each end of a broken piston ring?/Insufficient gap clearance

GENERAL

question/CORRECT ANSWER

When a diesel engine is equipped with a hydraulic starting system designed to operate at pressures of 150 psi or more, Coast Guard Regulations (46 CFR) require that the hydraulic fluid shall ____________./have a flash point of not less than 315°F

After an engine has been started using a Bendix drive unit, the drive gear, or pinion disengages from the flywheel due to ______________./the higher rotating speed of the flywheel

Friction, engine wear, and oil consumption in a diesel  engine are directly related to the ____________./viscosity of the oil

Heat exchangers are most commonly found in a small auxiliary diesel engine ____________./lube oil system

Diesel engine jacket water is used in the distillation  process as the ____________./means of heating the feedwater

A controllable pitch propeller on a diesel driven vessel eliminates the need for ____________./reversing gears

The term "PLAN/33,000" is equal to the _____________./IHP

An increase in the air inlet manifold pressure of a diesel engine will result in a/an ____________./decrease in fuel consumption per horsepower-hour

For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because _____________./changing filter elements would not interrupt engine   operation

One method of constructing large marine diesel engines and reducing the total engine frame weight is through   ____________./welding plates to form sections for assembly

Which of the following statements is true concerning an oil cooler?/The oil pressure is greater than the cooling water pressure.

The color of the exhaust from a diesel engine should be___________./clear

Concerning diesel propelled vessels, the astern power is to provide for continuous operation astern ___________./at 70 percent of the ahead rpm at rated speed

The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of __________./sacrificial zincs

Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to _____________./reduce electrolytic action on heat exchanger metals

An indication of microbial contamination is ______./stripping of paint in tanks

Which of the following conditions is indicated by the  presence of water in the scavenging air receiver?/Leaking aftercooler

Which of the following conditions is NOT an indication of microbial contamination?/Increased air filter changes

What is the purpose of the "window" installed in the housing of an individual jerk pump?/To allow the pump to be timed to the engine.

Shaker, circulation, and spray are the three general methods used in _____________./piston cooling

"Loop," "uniflow," "crossflow," and "return-flow" are terms used to describe various types of _____________./scavenging

The principal difference between loop scavenging and  crossflow scavenging, as used in single acting diesel  engines, is the _____________./direction of air flow within the cylinder

An electric heater built into some smaller diesel engines is used to _____________./increase jacket water temperature for easier starting in cold weather

Engines having a bore exceeding 250 mm, but not exceeding 300 mm are to have at least _________./one explosion relief valve in way of each alternate crank throw, with a minimum of two valves

Antifreeze solutions containing ethylene glycol, should not be mixed with corrosion protection oils, as the resultant mixture _____________./may cause frothing

If oil is dripping from the burner of a coil-type auxiliary steam generator, the cause may be _____________./all of the above

In which of the following areas of a crosshead engine is a permanently connected fire extinguishing system required?/Scavenging spaces in open connection to the cylinders.

A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of _____________./iron or steel

Which of the following listed construction details of  internal combustion engines is required?/A warning notice to caution against the opening of a hot crankcase for a specified period of time after shut down.

When checking zincs in a saltwater cooled heat exchanger, you should _____________./replace the zincs if they are 50% consumed

One advantage of hydraulic clutches over mechanical clutches in diesel engine installations is ____________./no mechanical connection exists between the driving and  driven elements

 /FALSE

Airflex clutches are used to transmit power from a diesel engine to the propeller shaft. A restricted orifice is used in the control air system of this unit to _____________./delay inflation of the clutch being engaged

When an additional load is applied to a diesel engine +which is using an air bladder clutch unit that is inadequately inflated, you can expect _____________./overheating because of slipping shoes

Slippage of an air operated friction clutch can result from _____________./an overloaded engine

Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or _____________./feeler gage

Increasing the load on an engine using a double-helix type injection pump varies the effective stroke of the pump to start _____________./earlier and end later

Effective hydraulic coupling operation depends upon a  certain amount of _____________./slip

One advantage of electromagnetic slip couplings is   _____________./torsional vibrations are reduced

The power loss associated with slip in a fluid coupling  appears as __________./heat in the hydraulic fluid

When changing the direction of propeller shaft rotation in a diesel plant equipped with a pneumatic clutch, you must  pause at neutral to allow the _____________./clutch to deflate

A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional   vibrations in the _____________./crankshaft

Which of the following statements represents an advantage of an electromagnetic clutch?/Engine torsional vibrations to the driven shaft are   eliminated.

A dirty diesel engine oil filter element can best be  detected by _____________./the pressure drop across the filter

In an electromagnetic coupling, torque to the driven shaft is limited by the _____________./coupling pullout value

If an auxiliary diesel engine will not crank but can be barred over, the trouble may be ___________./starting batteries

When the lower edge of the spiral begins to uncover the  release port in a jerk pump, the _____________./effective pumping stroke of the plunger ends

Proper operation of the main engine reduction gear set  requires the operator to monitor _____________./all of the above

The torque transmitted by an electromagnetic slip coupling is dependent upon excitation and the _____________./amount of slip

When air is delivered under pressure to one of the glands of an air-bladder clutch, the ____________./inside diameter of the clutch gland decreases

Wear occurring at the tips of the reduction gear teeth is usually the result of _____________./gear misalignment

When two diesel engines are electrically coupled in   parallel to a common propeller shaft, which of the operating conditions listed will apply?/Full horsepower is available ahead and astern.

Although slip in pneumatic clutches is normally undesirable in modern pneumatic clutch arrangements, some reduction gear units are provided with an optional slip clutch which is used to an advantage in _____________./obtaining maneuvering speeds below engine idle speed

At dead center, the centerline of the connecting rod  usually coincides with the _____________./centerline of the cylinder

The hunting of a diesel engine may be caused by ___________./low governor power

Connecting rods in a diesel engine are used to connect the _____________./piston to the crankshaft

The magnetic lock between the armature and field in an  electromagnetic coupling is established by _____________./energizing the field coils

 /FALSE

 /FALSE

Which of the couplings listed will prevent shock loads from being transmitted to an engine?/Hydraulic

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the  time, which of the listed operations will occur?/No fuel will be delivered.

Immediately after any diesel engine is started, the engineer should check the ____________./lube oil pressure

Piping from booster pumps to injection systems are to be at least ________./standard seamless steel

The best method for determining the amount of eccentricity or offset misalignment between the disconnected propeller shaft coupling flange and the reduction gear output flangeis by using a _____________./dial indicator mounted on one flange indicating any   misalignment of the other flange

Hydraulic couplings will transmit torque equal to the input torque by means of energy changes in a rotating vortex of liquid. For the vortices to form, there must be __________./slip between the impeller and runner

Which of the following will occur when the lower edge of the spiral, on the plunger of a jerk pump, uncovers the spill port?/The pressure drops and fuel delivery stops.

When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated ____________./counterclockwise, due to the bowl rotating clockwise

Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by _____________./misalignment of the gears

Which of the components listed is NOT found in a single  acting engine?/Double crankshafts

In an electromagnetic slip coupling, the slip _____________./generates the low frequency current which excites the  secondary electromagnet

Which of the listed diesel engine operating conditions  should be checked immediately after any diesel engine is started?/Lube oil pressure

Which of the following statements is correct concerning a hydraulic coupling?/Torque is controlled by the volume of oil in the coupling.

During extremely cold weather, while starting an engine, it turns too slowly and fails to start. This problem is most likely the result of ____________./high lube oil viscosity

Which of the couplings listed is normally not repairable, and is usually replaced if completely damaged?/Gear-type coupling

Load control on a diesel engine is accomplished by   _____________./rotating the fuel injector pump plunger

One of the most common causes of reduction gear failure is gear wear caused by scoring as a result of ______________./an inadequate lube oil film

Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with __________./inadequate lubrication

Which of the following characteristics is true relative to meshing spur gears?/The gear of larger diameter will rotate at a slower RPM.

When passing through mesh contact, the teeth of a reduction gear first go through a series of actions best described as __________./sliding

The color of the engine exhaust from a diesel propelled ship should be ______________./clear

Which of the combustion parameters listed is used in a  diesel engine, but NOT related to the injection system?/Effective stroke

The air bladder clutch used with some reversing reduction drive gears, consists of _____________./two independent clutches

The volume of available air supply required by an air clutch varies with the _____________./all of the above

Which statement about diesel engine combustion is true?/Maximum cylinder firing pressure is not developed   until the piston passes TDC.

Keel coolers fouled with marine growth, will result in  _____________./higher jacket water temperatures

The function of the window cast into the housing of an  individual jerk pump is to ____________./allow the pump to be timed to the engine

Which of the following conditions is most likely to occur if oil containing moisture is continuously fed to a purifier operating as a clarifier?/The bowl will eventually fill with water.

Theoretical perfect combustion in a diesel engine yields by-products of _____________./water vapor and carbon dioxide

Gear-type flexible couplings are often used in diesel engine drive trains because they _____________./are able to transmit high torque, even where slight   misalignment exists

Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a _____________./high temperature and a low viscosity

Poor combustion in a diesel engine can be caused by   ______________./low intake air temperature

A flexible coupling is located between the _____________./engine and the pinion

Exhaust pyrometer readings provide an indication of the  _____________./distribution of the load between engine cylinders

Injection lag can be caused by ____________./compressibility of the fuel

In most marine single reduction gear units, the bull gear is driven by the _____________./pinion gear

When cleaning a duplex strainer, it is important for  _____________./the pressure to be bled prior to opening the compartment cover

The driving force of a propeller is transmitted to the hull through the_____________./thrust bearing

An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is  _____________./fouled

High exhaust back pressure will result in an increase in ______________./carbon deposits on fuel injectors

Combustion gas venting through the expansion tank can be caused by a _____________./cracked cylinder head

Diesel engine control can be obtained by the bridge   _____________./only after the engine room control station is switched to "bridge control"

Exhaust pipes of multiple engine installations are not to be interconnected, but are to be run separately to the   atmosphere _______./unless arranged to prevent the return of gases to an idle engine

Combustion knock occurring in a diesel engine can be caused by _____________./prolonged ignition lag

Which of the following statements is a description of the combustion cycle?/The heat process which produces the force to initiate the movement of the engine parts.

An exhaust pipe from a internal combustion engine may not need to be insulated when _________./it is of the water jacketed type

An automated diesel engine should normally shut down due to _____________./low lube oil pressure

What is the function of an engine's stationary parts?/To keep moving engine parts in their proper relative  positions.

Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor?/Lube oil sump level

Combustion knock occurring in a diesel engine can be caused by ________________./low coolant temperature

Reduction gear casings are vented in order to _____________./avoid a buildup of pressure within the gear case

Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in _______./damage to cylinder heads and pistons

A gear type flexible coupling is precision built for  _____________./high torque transmittal under limited misalignment   conditions

Which characteristic of the Otto cycle occurs in the actual diesel cycle but NOT in the theoretical diesel cycle?/No volume increase during combustion.

Excessive diesel engine back pressure may be an indication of __________./carbon buildup in the exhaust manifold

Where engine bores exceed 230 mm, a bursting disc or flame arrester is to be fitted ___________./in way of the starting valve of each cylinder for direct reversing engines having a main starting manifold

The purpose of the energy cell, or air cell, is to ________./create a high turbulence within the main combustion chamber

Barrel face, taper face, grooved, and chrome plated are all types of diesel engine _____________./piston rings

Diesel engines are classified as reciprocating internal  combustion engines because they ______________./burn fuel in a chamber where its energy moves a piston back and forth

The total air capacity for non-reversible main engines is to be sufficient for _______./six consecutive starts

The thermal energy produced by an internal combustion engine is transformed into ______________./mechanical energy

Routine monitoring of a diesel engine should include  _____________./all of the above

White smoke exhausting from a diesel engine can result from ____________./low cooling water temperature

Black smoke exhausting from an operating diesel engine can be caused by _____________./fuel dribbling from leaking fuel injectors

A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an ___________./overspeed trip

Which of the following statements represents the advantage of a precombustion chamber used in an auxiliary diesel  engine?/Timing of injection does not need to be exact.

Oil control rings are designed with slotted holes to  _____________./permit excess oil to drain back to the sump

One advantage obtained from the use of a precombustion  chamber in a diesel engine is _____________./smoother combustion

Electrically operated safety devices on auxiliary diesel engines function to stop the engine by _____________./shutting off the fuel supply

White smoke exhausting from an operating diesel engine may indicate _____________./a cracked liner

If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm ___________./All of the above are correct.

White smoke issuing from the exhaust of an auxiliary diesel engine could mean _____________./the engine is cold

Precombustion chambers differ from turbulence chambers in that precombustion chambers _____________./contain a smaller portion of the total clearance volume

Oil control rings function to _____________./all of the above

Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to   _____________./all of the above

If a diesel engine fails to start, one of the likely causes is _____________./low compression temperature

Maximum horsepower of a diesel engine is attained   ____________./at rated engine RPM

What is commonly used to create turbulence in a diesel engine combustion system?/Shape of the piston crowns.

If a hydraulic starting motor turns, but the diesel engine does not, the most likely cause is ____________./a malfunctioning overrunning clutch

White smoke exhausting from a diesel engine can be caused by _____________./low combustion temperature

A smoking exhaust from an operating diesel engine could be caused by ______________./late fuel injection

In describing basic diesel engine operation, the term  "event" refers to _____________./All of the above

Bluish smoke in the exhaust of an operating diesel engine can be caused by ______________./a scored cylinder liner

Pyrometer thermocouples should be inspected and cleaned of carbon deposits ____________./every 6 months

A diesel engine may fail to start due to _____________./low air charge temperature

A diesel engine electric starting motor is operated under a no-load condition. Continuing to operate the motor unloaded will _______________./overspeed and cause serious damage

Where engine bores exceed 230 mm, a bursting disc or flame arrestor is fitted ____________./at the supply inlet to the starting air manifold for  non-reversing engines

The ratio of the brake horsepower to the indicated   horsepower of a diesel engine is its ______________./mechanical efficiency

The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the _____________./method of igniting fuel

A diesel engine is warmed up and white vapor is noted in the exhaust, this could indicate _____________./a leaking cylinder liner

Diesel engine operating conditions are indicated by the  color of the exhaust smoke. Blue smoke can indicate  _____________./clogged drain holes in the oil control rings

Oil accumulating in the exhaust piping or manifold of a  diesel engine can be caused by ________________./worn valve guides

A diesel engine with high lugging capacity, would be  necessary for driving a _____________./winch

Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?/Friction within the engine

What determines the number of events occurring in a cycle of operation in an internal combustion engine?/Type of engine (diesel or gasoline)

A diesel engine may fail to start when being cranked, due to _____________./insufficient compression

If a diesel engine hydraulic starting motor fails to  disengage from the engine, your FIRST check should be the _____________./overrunning clutch

Which of the following statements describes the operating characteristics of a precombustion chamber?/When fuel oil is injected into the precombustion chamber, it does not need to be as finely atomized as the fuel oil in diesel engines having direct injection.

One of the factors limiting the amount of load which can beput on a modern marine diesel engine is the ____________./exhaust temperature

An indicator card or pressure-volume diagram, shows   graphically the ____________./relationships between pressure and volume during one cycle of the engine

White smoke exhausting from a diesel engine can be caused by a ___________./cracked cylinder liner

A diesel engine emits blue exhaust smoke as a result of  _____________./excessive cylinder lubrication

If a diesel engine is smoking excessively under load, the cause could be _____________./plugged injector holes

If the diesel engine starter-drive mechanism fails to  disengage after the engine starts, which of the following situations will occur?/The starter motor will overspeed.

The purpose of the flywheel is to ______________./provide energy to operate the engine between power impulses

An emergency diesel generator should automatically shut down in the event of __________./all of the above

Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by  _____________./clogged air intake passages

In a modern internal combustion diesel engine, the load  carrying part of the engine is referred to as the _________./bedplate or base

According to U. S. Coast Guard Regulations (46 CFR),  internal combustion engine driven emergency generators shall be operated under load for at least two hours at least once ____________./a month

When disassembling or assembling an injection pump plunger and barrel you should _____________./all of the above

According to Coast Guard Regulations (46 CFR), how often shall internal combustion engine driven emergency generators be operated under load?/Once a month for two hours

Surface irregularities, such as erosion and pitting on  injection pump plungers, will _____________./affect fuel oil metering

Coast Guard Regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine must _____________./be arranged to prevent entry of boarding seas

Coast Guard Regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine to __________./terminate above the deepest load waterline

Auxiliary diesel engines can be automatically shut down as a result of __________./low lube oil pressure

If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?/Fuel

In the common rail system, excessive pressure in the header may be caused by _____________./improper adjustment of the bypass valve

According to Coast Guard regulations, keel cooler   installations are ____________./to be provided with shutoff or isolation valves except when installed forward of the collision bulkhead

One cause of diesel engine surging can be a result of  _______________./injection pump plungers stuck or worn

Which of the following conditions is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?/Pyrometer responses will be retarded.

The formula "Nplan/45,000" is equal to the _____________./IHP

At bottom dead center, the centerline of the connecting rod usually coincides with the _____________./centerline of the cylinder

Which of the listed devices could be used as a substitute for a ring grooving tool?/A section of the removed compression ring

Some diesel engines are supercharged with a _____________./turbocharger

Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or _____________./feeler gage and straight edge

In a diesel engine, blow-by _____________./causes excessive crankcase pressure

According to Coast Guard regulations, keel cooler   installations are ____________./permitted to be part of the vessel's hull as long as the material is of the same quality and thickness as the hull

Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?/All of the above.

Compared to a naturally aspirated diesel engine, a   supercharged diesel engine has _____________./a cylinder air charge of higher pressure

Starting aids such as glow plugs, are installed on _____./small diesel engines utilizing electric starting equipment

Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?/All of the above.

A supercharged diesel engine, when compared to a similar naturally aspirated diesel engine, will develop an increase in _____________./engine horsepower

The RPM of "D" is 700 and hobbed with 38 teeth. If gears "A", "B", and "C" have 82, 62, and 20 teeth respectively, the RPM of "A" in the gear train illustration is__________./104.64 RPM

At top dead center, the centerline of the connecting rod usually coincides with the _____________./centerline of the cylinder

The term "diesel engine scavenging" means ____________./forcing the products of combustion out of the cylinder with the fresh air charge

A diesel engine is supercharged in order to _____________./provide more air for combining with the fuel

Which of the following devices will increase the power  output of a diesel engine without increasing its frictional load?/Turbine-driven centrifugal blower

A bendix drive starting motor disengages the drive gear from the flywheel by ______________./the high rotating speed of the flywheel

When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect _____________./overheating because of slipping shoes

Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency?/Aftercooler

Vibrations from diesel engines and engine driven equipment are isolated from the hull structure by _____________./flexible engine mountings

The purpose of an aftercooler is to _____________./increase the density of the inlet air

Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?/Aftercooler

Which of the designs listed will keep the lobes from making contact in a Roots-type blower?/Blower timing gears

The side pressure per unit of area, resulting from the  angularity of the motion of the connecting rod, depends  primarily on the ____________./length of the piston

The lobes of a Roots-type blower are sometimes twisted into a spiral formed around the axes of rotation to ____________./produce a more constant airflow

Most Roots-type blowers have two rotors which _____________./rotate in opposite directions

Some diesel engines are equipped with a Roots-type blower to provide ______________./more air to combine with the fuel

Which of the following terms best describes the Roots-type blower used to supercharge a diesel engine?/Positive displacement

In a diesel engine, a positive displacement type blower isusually ____________./gear driven by the engine

Before starting a diesel engine, you should always   _____________./check the crankcase oil level

Which of the following should always be checked prior to starting a diesel engine?/Crank case oil level

Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable  aftercooler?/Run at reduced speed until the cooler can be repaired or renewed.

Which of the following operating procedures should be  carried out immediately after any diesel engine is started?/Verify proper lube oil pressure.

After starting a diesel engine, which of the listed   operating conditions should be checked FIRST?/Lube oil pressure

When a diesel engine is operated at partial load, as  compared to full load, a decrease will occur in the average _____________./combustion pressure on the power stroke

A diesel engine should not be operated at low loads for long periods of time because _____________./all of the above

What harmful condition can result if a diesel engine is  operated at very light loads for long periods of time?/Increased carbon buildup.

Early injection timing is indicated by ____________./low exhaust temperature and high firing pressure

In the construction of a diesel engine, what is the purpose of end plates?/To add rigidity to the block and a surface for attaching other parts.

The exhaust ports of a diesel engine using the crossflow scavenging method are opened and closed by the ____________./reciprocating motion of the piston

In a Roots-type rotary blower, the volume of air delivered is directly proportional to _____________./engine speed

A safety cover differs from other diesel engine access doors in that it is fitted with a __________./spring-loaded pressure plate

On a diesel engine equipped with a Roots-type blower,  ___________./the blower speed is proportional to the engine speed

A Roots-type blower installed on some diesel engines, serves to _____________./push out exhaust gases and replace them with fresh air

A normally operating diesel engine is shutdown by _________./securing the fuel supply

A Roots-type blower installed on a direct reversible engine _____________./reverses rotation along with the engine

Before being shut down, a diesel engine should idle a few minutes in order to _____________./prevent damage from localized overheating

The power consumed during the scavenging process of adiesel engine is known as the _____________./pumping loss

The small clearances existing between each of the blower lobes, and between the lobes and casing of a Roots-type  blower, must be maintained to ______________./prevent abnormal air leakage

When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by  _____________./renewing both driving and driven gears as a set

In accordance with Coast Guard Regulations (46 CFR), which of the listed starting aids is acceptable for use with the emergency diesel generator?/Thermostatically controlled electric water jacket heater.

Which of the following precautions must be taken if an  electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?/Electrical power to the heater must be secured before the cooling system is drained.

Coast Guard Regulations (46 CFR) state that emergency diesel generator starting systems must have sufficient capacity to provide at least _____________./6 consecutive cranking cycles

Which of the listed devices is the only method allowed by Coast Guard Regulations (46 CFR), to ease the starting of emergency generator engines?/Thermostatically controlled electric water jacket heating.

Cold weather starting of a diesel engine may be made easier by _____________./heating the jacket water

A thin film of oil on the lobes of a Roots-type blower  indicates _____________./leaking rotor bearing oil seals

Jacket water heaters are used on diesel engines to ________./help the engine start easier in cold weather

The large number of mechanical and pulsating vibrations  developed in a diesel engine may damage an attached   _____________./gas driven turbocharger because it has a wide speed range and high temperature materials that are subject to resonant vibration

Cold weather starting of a diesel engine is more difficult than warm weather starting due to _____________./increased drag of pistons and bearings due to increased oil viscosity

Starting aids, such as glow plugs, are installed on   _____________./small diesel engines started with an electric motor and  batteries

Air motors used for starting some auxiliary diesel engines are generally the type known as a/an ____________./vane motors

Which of the listed devices is often clutched to the  flywheel of small and medium size diesel engines for the purpose of starting?/Air motor

Which internal combustion engine starting system uses a vane type fluid motor?/Compressed air

Injection lag in a diesel engine may be caused by _________./the diesel fuel used having a high viscosity

Diesel engine injection lag is caused by _____________./compressibility of the fuel

Crank lead can be adjusted to change which of the listed operating conditions?/Longer combustion events.

Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure. Which of the listed pre-start   procedures should be carried out?/All of the above.

Standby, or emergency diesel generator day tanks should always be kept full to reduce the possibility of __________./moisture formation

An accumulator used in a hydraulic starting system is generally located between the _____________./pump and the starting motor

The device used to store a charged pressure for an hydraulic starting system is called the _____________./accumulator

In a hydraulic starting system, oil to the starting motor flows from the _____________./accumulator

On board supply vessels, a centrifuge is normally used to purify _____________./fuel oil

Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because ____________./the system can be manually recharged

In a diesel engine, blow-by is generally the result of worn _____________./compression rings

Which of the types of motors listed is used in a hydraulic starter?/Piston

Which type of motor listed is used as a hydraulic starter?/Piston

In a Bendix starter drive, the initiation of pinion   engagement with the flywheel ring gear is by _____________./starter drive shaft rotation

Diesel engine blow-by is the leakage of combustion gases past the _____________./compression and scraper rings

In a starting motor equipped with a Bendix drive, the  pinion moves and meshes with the flywheel ring gear  due to __________./the threaded sleeve's rotation

If the bowl of a disk type centrifugal purifier when  operated as a separator is not primed, the _____________./oil will be lost through the water discharge ports

The device used to engage a diesel engine starting motor with the flywheel ring gear is the ____________./automatic pinion-shift (Bendix) mechanism

The use of push rods are necessary in a diesel engine when _____________./the camshaft is located some distance below the rocker arms

Marine auxiliary diesel engine starters utilizing Bendix drive gear are powered by an electric starting motor or  _____________./hydraulic starting motors

The pinion of an electric starting motor used with a diesel engine engages the flywheel ring gear by a/an ____________./Bendix drive or similar mechanism

Electric starting motors for diesel engines require high current for operation and _____________./will carry a 100% overload for a brief period

Auxiliary diesel engine electric starting motors use  ____________./direct current

Diesel engine electric starting motors generally require heavier duty motors and operate at higher voltages than  comparable starting motors for gasoline engines due to  _____________./higher compression pressures

Electric starting motors for diesel engines require high current for their operation. As a result of this, they  ______________./will carry a 100% overload for a brief period

The most common instrument used to measure diesel engine exhaust pressure is the _____________./manometer

When monitoring diesel engine performance, the most useful instrument to use is the _____________./exhaust gas pyrometer

A pyrometer is an instrument commonly used to measure  _____________./exhaust gas temperature

Exhaust gas pyrometers are useful for ____________./detecting faulty combustion in individual cylinders

Pyrometers commonly found on diesel engine exhaust systems, consist of ______________./thermocouples and a voltmeter

Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?/It can indicate temperature at a distant point from the  source of heat.

A dry-type spark arrestor removes sparks from a diesel  engine exhaust by _____________./changing directions of exhaust gas flow

Wet-type exhaust silencers, used with some diesel engines, have which of the following design features in common?/The internal baffles break up the exhaust gas pulsation.

In accordance with Coast Guard Regulations (46 CFR)   regarding internal combustion engine exhaust manifold  installations, which of the following statements is true?/They may be water-jacketed and cooled by the discharge from a pump which operates only when the engine is running.

Which operating condition of a diesel engine is indicated by excessive firing pressures?/Overload

Coast Guard regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine must ______________./terminate above the deepest load waterline

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to _____________./muffle exhaust gas noise

When the solenoid of a Bendix drive type starter is   energized by operating the starter switch, the ____________./plunger completes the circuit between the battery bank  and starting motor

In some Bendix drive electric starting systems, the sudden shock of the pinion gear being engaged with the flywheel is absorbed by the ____________./action of the friction clutch

Exhaust pipes for separate diesel engines can be combinedonly when _____________./they are arranged to prevent gas backflow to each engine

Which of the following operating characteristics of the  Bendix drive friction clutch is associated with a Bendix drive starter?/Helps absorb the shock when the pinion engages the ring  gear.

For a diesel engine, which of the following time increments represents the longest period the electric starter motor may be operated continuously?/30 seconds

If a diesel engine were running at 20% overload with a smoky exhaust, you should _____________./slow the engine allowing it to gradually cool

The hydraulic starting motor is operated by hydraulic fluid flow under pressure from the _____________./accumulator

The purpose of the engine-driven hydraulic pump in a diesel engine hydraulic starting system is to ____________./maintain pressure in the accumulator

To reduce load during jacking operations, which of the  listed devices should be opened?/Cylinder test valves

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?/Lube oil pressure

The exhaust system for a diesel engine is usually designed to remove exhaust gases and to _____________./muffle exhaust noise

Misfiring in a diesel engine at light loads can be caused by ____________./excessive cylinder cooling

Before any diesel engine hydraulic starting system is opened for servicing or repair, you must _____________./bleed off all hydraulic pressure from the system

An auxiliary diesel engine may fail to start due to   _____________./insufficient cranking speed

If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be ____________./air in the fuel lines

Which of the listed conditions will result in the failure of an auxiliary diesel engine to shut down?/Lube oil entering in the air intake manifold.

If a diesel engine continues to run after attempting to  shut it down, the probable cause is _____________./lube oil leakage into the air intake system

Which of the following conditions is most likely to occur if the electric starter motor pinion gear fails to disengage from the flywheel of a diesel engine after the engine has started?/Starting motor will dangerously overspeed

If the auxiliary diesel engine will not shut down, the  trouble could be _____________./lube oil leakage into the blower

A diesel engine cranks properly during starting but   immediately stalls. Which of the following systems is most likely at fault?/Fuel

If an auxiliary diesel engine frequently stalls, the trouble may be caused by _____________./air in the fuel system

An operating diesel engine that suddenly loses power,  is due to a/an _____________./restricted turbocharger air intake

If a diesel engine turned over freely but failed to start, the cause could be _____________./water in the fuel

A diesel engine could fail to start because of ____________./incorrect injection timing

Excessive vibration in an operating diesel generator may be caused by _____________./loose engine mounting bolts

The bore of a diesel engine describes the _____________./diameter of the cylinder

If an auxiliary diesel engine equipped with an electric  starting system cranks very slowly after repeated attempts to start, the cause could be a/an ____________./overheated motor windings

Which of the listed diesel engine starting systems is most susceptible to difficulties in cold weather?/Electric

If a diesel engine, with an electric starter, cranks very slowly after repeated attempts to start, the cause could be _____________./an overheated starting motor

If cranking a diesel engine is too slow while attempting to start, it will result in _____________./insufficient heat of compression

If a diesel engine rotates slowly when cranked, but does not fire, the ___________________./engine has failed to reach its firing speed

A diesel engine may be hard to start if the _____________./air intake is restricted

The formation of carbon monoxide in diesel exhaust gases is reduced by ____________./maintaining proper combustion and scavenging

Which of the listed failures, occurring in an automated  diesel generator system, should cause an audible alarm at the engine room control station?/Low starting air pressure

A restricted diesel engine exhaust manifold operating under a normal load is indicated by ______________./low firing pressures and high exhaust temperatures

A dry-type exhaust silencer clogged with soot, will cause _____________./loss of engine power

If an auxiliary diesel engine will not crank but can be barred over, the trouble may be in the ____________./starting batteries

Clogged or partially obstructed exhaust ports on a diesel engine can cause _____________./high exhaust temperatures

A diesel engine fails to start, even though it can be barred over, but not cranked over. The probable cause is _______./a closed or obstructed air starting line valve

Which of the following notations does the "N" represent in the formula shown below?         IHP= PLAN/(33000)/Number of power strokes per minute.

Partially obstructed exhaust ports on a diesel engine can cause _____________./all of the above

An accumulation of carbon on one of its thermocouples of an exhaust gas pyrometer will ______________./read low for that location due to the insulation effect of the deposits

If carbon accumulates on a pyrometer thermocouple, it will cause _____________./the pyrometer to read low

Black smoke exhausting from a diesel engine may be caused by _____________./a clogged air cleaner

Open combustion chambers are designed to _____________./provide proper fuel/air mixing

Engine operating conditions may be indicated by the color of the exhaust smoke. Black smoke could indicate ____________./an overloaded engine

The primary purpose of the open combustion chamber used in diesel engines is to _____________./provide a place for combustion

Black smoke exhausting from a diesel engine indicates  _____________./incomplete combustion

A dark exhaust from a running diesel engine can be caused by _____________./late ignition

Turbulence in the combustion chamber of a diesel engine can be induced by _____________./directional intake ports

In describing engine operation, what does the term "cycle" mean?/The sequence of events that produce a power pulse.

Which of the listed devices could be used as a ring groove cleaning tool during preparation for the installation of new rings?/A section of the removed compression ring