单项选择题

If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

A.excessive ring action
B.excessive ring temperature
C.improper ring rotation
D.excessive ring face wear

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单项选择题

Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）

A.higher speed required
B.flywheel-effect
C.lower starting temperatures
D.higher compression pressures

单项选择题

The size of the exhaust valve opening is （）

A.most critical in a four-stroke cycle diesel engine
B.most critical in a two-stroke/cycle diesel engine
C.most critical in a four-stroke/cycle diesel engine if it is turbocharged
D.of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

单项选择题

If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）

A.The oil control rings will seal improperly and wear rapidly
B.The piston will overheat due to insufficient lubrication
C.Excessive oil will remain on the cylinder wall
D.Light brown smoke will emanate from the engine exhaust