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單項(xiàng)選擇題

When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）

A.an obstruction in an cylinder
B.water accumulation in some engine cylinders
C.low starting air pressure
D.low scavenge air pressure

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單項(xiàng)選擇題

Black smoke exhausting from a diesel engine indicates（）

A.proper fuel injection
B.water in the fuel
C.incomplete combustion
D.burning of lube oil

單項(xiàng)選擇題

Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）

A.an insufficient speed droop setting
B.an overloaded engine
C.clogged drain holes in the oil control rings
D.complete combustion

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