单项选择题

White smoke exhausting from an operating diesel engine may indicate （）.

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air

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单项选择题
Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

A.increasing the volume of intake air
B.shutting off the fuel supply
C.increasing the engine back pressure
D.over-speeding the engine
单项选择题
When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）

A.During operation at low speed
B.During operation at rated speed, but low power output
C.During acceleration
D.All of the above
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