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

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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

单项选择题

Many cast iron pistons are designed with heat dams, which serve to （）

A.keep piston crown temperatures elevated for smoother combustion
B.reduce the possibility of overheating the top compression ring
C.help retain the heat of compression to prevent ignition delay
D.help retain the heat of compression to prevent combustion knock

单项选择题

The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient（）

A.dispersant additives
B.floc point
C.alkalinity additives
D.ignition quality