单项选择题

The ratio of the brake horsepower to the indicate of a diesel engine is its （）

A.thermal efficiency
B.mechanical efficiency
C.brake thermal efficiency
D.volumetric efficiency

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单项选择题

In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）

A.wide compression rings are used
B.oil rings are located above the piston
C.chromium plating is used on all piston rings
D.oil rings are located near the bottom of the piston skirt

单项选择题

An over-speed trip stops a diesel engine when the engine （）

A.runs out of fuel
B.has low lubricating oil pressure
C.exceeds a set maximum speed
D.has high cooling water temperature

单项选择题

To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.

A.prevent any lubricant from reaching
B.prevent excessive lubrication from reaching the combustion space
C.Provide metal-to-metal contact to seal the cylinder against blow-by
D.assure a positive means of scraping carbon accumulation from the cylinder