In an operating diesel engine, pre-ignition can be caused by （）

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• In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）

  A . noise coming from that air starting valve B . continuous operation of the starting air compressor C . zero air pressure in the air starting system D . overheated starting air pipe to the cylinder head

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• The load sharing characteristics of two diesel generator operating in parallel are mostly dependent on their governor （）.

  A . load limit settings B . idle speed settings C . speed limit settings D . speed droop setting

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• A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）

  A . worn valve seats B . worn main bearing C . excessive valve clearance D . weak rocker arm spring

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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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• If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）

  A . a low level in the engine expansion tank B . excessively high coolant pressure C . improper temperatures D . malfunctioning of the jacket water heater

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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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• White smoke exhausting from an operating diesel engine may indicate （）.

  A . a cracked liner B . burning lube oil C . an overloaded engine D . insufficient combustion air

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• A smoking exhaust from an operating diesel engine could be caused by （）

  A . low sulfur content in the fuel B . a loose injector inlet connection C . late fuel injection D . high injection pressure

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• In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

  A . metal particles loosened by wear B . air when no air cleaners are used C . condensation of water vapors D . breakdown of the lubricating oil by dilutio

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• Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

  A . water in the fuel B . insufficient fuel for combustion C . clogged air intake passages D . burning lubricating oil

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• An emergency diesel generator should automatically shut down in the event of （）

  A . dangerous over-speeding B . a loss of lube oil pressure C . activation of the fixed CO system for the emergency generator space D . all of the above

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• An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）

  A . advance as the load increases B . retard as the load increase C . remain unchanged regardless D . always occur at top dead center

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• Excessive vibration in an operating diesel generator may be caused by （）

  A . electrical overload B . surging at governed RPM C . loose engine mounting bolts D . coolant leaking into the cylinder

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• Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）

  A . scavenging B . forced draft C . turbo-charging D . aspiratio

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• Black smoke exhausting from an operating diesel engine can be caused by （）

  A . fuel dribbling from leaking fuel injectors B . burning fuel with a high carbon content C . burning fuel with a high vanadium content D . burning fuel with a lower sulphur content

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• Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.

  A . decreased fuel consumption per brake horsepower B . more complete cylinder scavenging C . extended valve life D . carbon formation on combustion chamber surface

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• 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 （）

  A . expansion of the combustion gases B . exhaust and intake valves just closing C . maximum compression is just being attained D . fuel injection occurring at that point and combustion begi

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• An increase in load on a diesel engine results in （） of speed of the crankshaft.

  A . a reduction B . an increase C . an outing D . a downward

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• Lubricating oil viscosity in an operating diesel engine can be reduced by（）

  A . increasing cooling water flow B . increasing lube oil flow C . dilution by fuel oil D . adding SAE 70 oil

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• A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）

  A . feel the high pressure fuel line B . check the cylinder exhausts for white smoke frequently C . check the cylinder exhaust temperature D . isolate each cylinder and inspect the injector

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• An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

  A . manoeuvring operations B . bad combustion C . cooling D . mooring trial

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• Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

  A . changing the direction of exhaust gas flow B . increasing the exhaust gas velocity C . changing the exhaust gas weight D . increasing the exhaust gas static pressure

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• 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 （）

  A . engine support vibration isolator B . detuner or viscous fluid damper C . lightened crankshaft flywheel D . spherically seated crankshaft bearing

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