A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air
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A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play
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
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
A.excessive ring action
B.excessive ring temperature
C.improper ring rotation
D.excessive ring face wear
A.higher speed required
B.flywheel-effect
C.lower starting temperatures
D.higher compression pressures
最新試題
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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
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