单项选择题

A waste heat boiler is installed on some diesel propelled vessels to （）.

A.provide steam for emergency propulsion
B.provide steam for the turbo-generator
C.heat the waste water tanks
D.steam for warming engines

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What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）

A.375 RPM
B.500 RPM
C.750 RPM
D.1500 RPM

单项选择题

An electric heater built into some smaller diesel engines is used to （）.

A.raise lube oil viscosity for easier starting in cold weather
B.increase air inlet temperature
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单项选择题

A SECONDARY function of a waste heat boiler is to （）.

A.reduce engine exhaust noise
B.reduce engine back pressure
C.increase engine cycle efficiency
D.increase turbocharger efficiency