单项选择题

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air

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单项选择题

Improperly fitted piston rings in a diesel engine can cause（）

A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play

单项选择题

Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）

A.twice as large as with a cast iron piston
B.the same size as with a cast iron piston
C.half as large as with a cast iron piston
D.the same size as the crown of an aluminum piston

单项选择题

Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

A.increase back pressure during the exhaust process
B.facilitate periodic replacement of the valves
C.reduce the pumping loss associated with scavenging
D.reduce tension on valve springs