单项选择题

Black smoke exhausting from an operating diesel engine can be caused by （）

A.fuel dribbling from leaking fuel injectors
B.burning fuel with a high carbon content
C.burning fuel with a high vanadium content
D.burning fuel with a lower sulphur content

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单项选择题

White smoke exhausting from a diesel engine can be caused by a （）

A.high combustion temperature
B.high compression pressure
C.cracked cylinder liner
D.fuel with a high vanadium content

单项选择题

White smoke exhausting from a diesel engine can be caused by （）

A.low combustion temperature
B.a leaking fuel nozzle check valve
C.late fuel injection
D.plugged oil-scraper ring hole

单项选择题

White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）

A.the engine is overloaded
B.the engine is cold
C.there is too much lube oil in the cylinders
D.the turbocharger is fouled