单项选择题

For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）

A.moving the governor control to stop
B.shutting off the lubricating oil supply
C.tripping the governor emergency stop lever
D.shutting off the fuel supply

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单项选择题

If a diesel engine is smoking excessively under load, the cause could be （）

A.low exhaust back pressure
B.early fuel injection in one of the cylinders
C.compression pressure in one of the cylinders
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A diesel engine emits blue exhaust smoke as a result of（）

A.cold intake air
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A.grinding the spare plunger to the barrel
B.replacing the plunger and the barrel
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