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
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相关考题
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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 -
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
