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

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单项选择题

Which of the listed cylinder liner surface conditions indicates proper lubrication?（）

A.Dull black appearance
B.Bright appearance
C.Thin layer of lacquer
D.Thick oily film

单项选择题

In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）

A.noise coming from that air starting valve
B.continuous operation of the starting air compressor
C.zero air pressure in the air starting system
D.overheated starting air pipe to the cylinder head

单项选择题

An over-speed trip serves to （）

A.stop the engine by cutting off the cooling water supply
B.stop the engine by closing the air intake
C.slow the engine but not stop it
D.slow the engine to half of normal load