Faulty operation of diesel engine fuel injection nozzles can be directly 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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• Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except （）

  A . open the indicator cocks B . supply some LO to cylinder liner wall with lubricator C . put the fuel handle in the "stop" position D . pump up the air bottle

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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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• The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

  A . an isochronous governor B . elastic engine mounts C . a vibration damper D . a cast iron bed plate with good flexible qualitie

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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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• 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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• Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

  A . Impeller B . Compressor C . After-cooler D . Exhaust differ

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• If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）

  A . Intake manifold pressure will be high B . Intake manifold pressure will be unaffected C . Exhaust temperatures will be high D . Exhaust temperatures will be low

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• Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.

  A . excessive fuel nozzle holder cooling B . sediment in the fuel supply C . distortion of the fuel spray pattern D . improper atomization of the fuel

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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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• Faulty operation of any system is indicated by very definite （）.

  A . symptoms B . samples C . traces D . track

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• The satisfactory operation of diesel engine exhaust valves usually depends on（）

  A . the proper back pressure B . the cooling water temperature C . correct timing and proper seating D . accurate metering and the exhaust temperature

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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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• How would the exhaust of a properly operating diesel engine appear?（）.

  A . Light blue haze B . Light brown haze C . Light gray haze D . Perfectly clear

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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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• 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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• 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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• The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

  A . two-stroke B . four-stoke C . long-stroke D . short-stroke

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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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• The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）

  A . method of supplying air B . cooling system C . method of igniting fuel D . valve operating mechanism

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• The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.

  A.principle B.principal C.cause D.case

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