单项选择题

The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

A.direct action of cam shaft
B.compressed air pressure
C.hydraulic “push rods”
D.direct action of the main piston moving down

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单项选择题

In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove

A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) axe correct

单项选择题

Engine displacement is equal to the cylinder （）.

A.area times the stroke
B.area times the stroke, times the number of cylinders
C.volume times the stroke
D.volume times the stroke, times the number of cylinders