单项选择题

The rate of pressure rise during the period following fuel ignition in a diesel will result in （）

A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency

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单项选择题

Higher than normal temperature air passing through the intake of a diesel engine will result in（）

A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio

单项选择题

Air scavenging of a diesel engine cylinder（）

A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above

单项选择题

The term diesel engine scavenging means（）

A.delivering more air into the cylinder than it would normally receive during an ordinary charging process
B.forcing the products of combustion out of the cylinder with the fresh air charge
C.collecting the air charge at the cleaner
D.combustion and expansion of hot gas