單項(xiàng)選擇題A diesel engine is supercharged in order to（）

A.lower the no-load RPMs
B.provide more air for combine with the fuel
C.increase the no-load RPMs
D.provide more fuel combine with the air


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1.單項(xiàng)選擇題Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）

A.high firing pressure
B.overload of that particular cylinder
C.smoky exhaust
D.cooling water temperature rise

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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