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單項(xiàng)選擇題

In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）

A.bedplate or base
B.sump or oil pan
C.cylinder block
D.frame

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單項(xiàng)選擇題

Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

A.water in the fuel
B.insufficient fuel for combustion
C.clogged air intake passages
D.burning lubricating oil

單項(xiàng)選擇題

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）

A.increased horsepower
B.reduced efficiency
C.increased heat loss
D.lower cylinder pressures

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