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單項選擇題

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

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單項選擇題

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

單項選擇題

An emergency diesel generator should automatically shut down in the event of （）

A.dangerous over-speeding
B.a loss of lube oil pressure
C.activation of the fixed CO₂system for the emergency generator space
D.all of the above