單項選擇題

The diameter of a piston is usually less at the crown than at the skirt, in order to （）.

A.facilitate the installation of piston rings
B.allow for the expansion of the piston during operation
C.prevent crankcase vapors from entering the combustion chamber
D.reduce wearing of the upper cylinder liner

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單項選擇題

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

單項選擇題

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

The diameter of a piston is usually less at the crown than at the skirt, in order to （）.

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

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

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