On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）

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• The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.

  A . fuel injectors B . exhaust valves C . intake valves D . all of the above

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• Excessively worn, or polished ends on a diesel engine valve spring, indicate（）

  A . burned exhaust valves B . excessive spring compression C . spring surge D . worn valve seat

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• The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）

  A . camshaft B . crankshaft C . governor D . flywheel

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• On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.

  A . a spindle lubricator B . an oil jet C . internal splashing D . drilled passages in the crankshaft

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• Leaking oil seals on a diesel engine turbocharger can cause（）

  A . the engine to run after the fuel has been secured B . the engine to over-speed C . a fire D . all of the above

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• On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）

  A . Engine is hard to start B . Engine misses C . Surges at governed RPM D . Coolant temperature is too low

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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• On a diesel engine, fuel is delivered into the combustion space by （）.

  A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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• Lubricating oil should be changed on a heavy duty diesel engine when（）.

  A . it gets dark in color B . a sample rubbed between fingers feels thin C . it has been in use for a specified interval D . it no longer supports combustio

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• The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

  A . direct action of cam shaft B . compressed air pressure C . hydraulic “push rods” D . direct action of the main piston moving dow

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• When installing rings on a diesel engine piston, you should check the ring（）

  A . diametrical tension B . gap clearance C . radial thickness D . face thickne

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• The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

  A . reduce water temperature B . reduce water turbulence C . provide an air cushion D . allow for an increase in water volume as the engine warms u

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• Clogged or partially obstructed exhaust ports on a diesel engine can cause（）

  A . over-speeding of the engine B . failure of the engine to shut down C . no effect of engine mounting bolts D . high exhaust temperature

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• On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）

  A . dial indicator B . outside caliper C . bridge gauge D . tram rod

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• A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）

  A . combustion gas blow-by B . excessive lubrication C . properly functioning rings D . insufficient cylinder cooling

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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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• If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）

  A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

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• If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

  A . excessive ring action B . excessive ring temperature C . improper ring rotation D . excessive ring face wear

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• Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）

  A . a combination of constant volume and constant pressure B . a combination of constant temperature and constant pressure C . entirely constant pressure D . entirely constant volume

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• On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

  A . piston rod guides B . engine thrust bearing C . crosshead bearing D . main shaft flexible coupling

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• What is the effect of heated intake air on a diesel engine? （）

  A . Increases efficiency B . Increases engine horsepower C . Increases engine life D . Reduces engine horsepower

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• On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）

  A . Overspeed trip B . Air inlet shut-off valve C . Water injector D . Fuel cutoff valve

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• "Scavenging" on a diesel engine means （）.

  A . injecting fuel oil into a cylinder B . removing exhaust gases from the cylinder C . forcing air into the cylinders under pressure after the exhaust valve has dosed D . a combination of all the above

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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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