In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）

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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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• 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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• An electric heater built into some smaller diesel engines is used to （）.

  A . raise lube oil viscosity for easier starting in cold weather B . increase air inlet temperature C . increase compression ratio D . increase jacket water temperature for easier starting in cold weather

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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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• 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 interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）

  A . aluminum plates B . lead cathodes C . copper baffle plates D . sacrificial zinc

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• The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）

  A . prevent engine back pressure at heavy loads B . increase total engine efficiency at low loads C . prevent boiler corrosion at low engine loads D . improve engine fuel consumption at any load

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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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• 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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• The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）

  A . governor flyweight action on a pilot valve which controls fuel injection B . governor flyweight motion acting on fuel controls through suitable linkage C . positioning a butterfly valve in the fuel delivery system positioning D . a servomotor piston attached to the fuel control

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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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• In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

  A . Bedplate B . Block C . Base D . Sum

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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 reversing cams of some four-stroke/cycle diesel engines are brought into position by （）

  A . sliding the camshaft along its axis B . rotating the cam 180 C . rotating the cam followers 180 D . moving the idler sprockets in the drive chai

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• The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）

  A . increase the density of the intake air B . decrease turbocharger power usage C . reduce exhaust gas temperature D . compensate for turbocharger PRM fluctuatio

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• Some diesel engines are supercharged with a （）

  A . slam charger B . turbocharger C . fuel atomizer D . fuel injector

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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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• Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）

  A . increase blow-by in all cylinders B . incomplete combustion in all cylinder C . overloading in all cylinders D . insufficient fuel delivery to all cylinder

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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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• The over-speed trip device installed in some diesel engines is automatically actuated by__________.

  A.spring force B.hydraulic pressure C.centrifugal force D.mechanical linkage

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• The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by______.

  A.governor flyweight action on a pilot valve which controls fuel injection B.governor flyweight motion acting on fuel controls through suitable linkage C.positioning a butterfly valve in the fuel delivery system positioning D.a servomotor piston attached to the fuel controls

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