單項(xiàng)選擇題Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?()

A.Lube oil is diluted and its viscosity is reduced
B.Sulfuric acid is formed
C.Bearings become pitted ad immediately fail
D.Valve stems develop sludge deposits


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1.單項(xiàng)選擇題If a few injector spray holes become plugged, the result could be ()

A.excessive surging at governed speed
B.combustion knock under load
C.poor fuel combustion
D.all of the above

3.單項(xiàng)選擇題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 consumption

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?()

A.Pre-lube cylinders with hand cranks
B.Open all air space drain cocks
C.Open all indicator valves
D.All of the above

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