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單項(xiàng)選擇題

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）

A.overloading the engine
B.low exhaust valve lift
C.excessive cylinder cooling
D.insufficient mechanical clearance

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單項(xiàng)選擇題

In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

A.exhaust manifold
B.valve bridge
C.pressure of the fresh air charge
D.valve adjusting gear

單項(xiàng)選擇題

If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be （）

A.excessive compression pressure
B.air in the fuel lines
C.high fuel pressure
D.excessive load