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

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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

单项选择题

Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）

A.increase the liner area covered by the oil film
B.maintain an oil film on the lower liner where scuffing is prevalent
C.keep excess oil away from intake and exhaust ports
D.help cushion piston skirt side thrust by providing a hydrodynamic oil wedge