In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.

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• Directional intake ports in diesel engines are used to （）.

  A . reduce air charge turbulence B . induce air swirl C . deflect hot combustion gas away from the valves D . oppose the effects of piston induced squish

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• Excessive piston ring wear in a diesel engine will cause（）

  A . high lube oil viscosity B . increased lube oil consumption C . low lube oil temperatures D . high firing pressure

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• Diesel engine fuel oil contamination often results in （）

  A . governor malfunctions B . fuel injection system malfunctions C . high cylinder lube oil temperatures D . low intake temperature

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• A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

  A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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• Proper atomization of fuel in diesel engine combustion chambers will （）.

  A . affect the injection pressure B . improve combustion C . reduce compression pressure D . decrease power output

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• Engine coolant accumulating in the diesel engine lubricating oil can result from a （）

  A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

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• A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）

  A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

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• Defective timing gear in a diesel engine may lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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• What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

  A . Spark plug B . Heat of compression C . Carburetor D . Glow ping

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• Worn main bearings in a diesel engine can result in （）

  A . decreased compression pressure B . increased lube oil pressure C . lower lube oil temperature D . excessive leakage past the piston ring

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• The intake valves in a diesel engine are reseated by （）.

  A . cam followers B . push rods C . combustion gases D . valve spring

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• Fuel is ignited in a diesel engine cylinder by （）

  A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

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• Improperly fitted piston rings in a diesel engine can cause（）

  A . excessive lube oil consumption B . lower than normal lube oil temperature C . higher than normal exhaust back pressure D . excessive crankshaft end play

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• Poor combustion in a diesel engine can be caused by （）.

  A . high compression pressure B . low intake air temperature C . low exhaust pressure D . high scavenge air pressure

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• A diesel engine is supercharged in order to（）

  A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

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• A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.

  A . starting B . stopping C . to start D . to sto

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• Critical speed in diesel engines occurs when engine torque pulsations become （）

  A . opposed to the crankshaft rocking couple B . resonant with the crankshaft natural frequency C . critical fore and aft crankshaft vibrations D . horizontal whipping motions of the crankshaft

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• Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

  A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

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• Defective governor in a diesel engine may lead to （）.

  A . smoky exhaust B . starting failure C . ignition relay D . over speed

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• A restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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• The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

  A . air bottle B . air compressor C . crank case D . combustion chamber

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• Worn diesel engine intake valve guides can result in （）

  A . increased engine breathing efficiency B . excessive valve lash C . excessive lube oil consumption D . lower than normal fuel consumptio

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• In a diesel engine, blow-by（）

  A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio

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