单项选择题

Performance of a turbocharged engine can be improved by（）

A.decreasing the amount of valve overlap
B.preheating the air intake
C.after-cooling the intake air
D.preheating light fuel

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单项选择题

Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）

A.Planetary gear set
B.Torsional vibration damper
C.Friction clutch
D.Air bladder clutch

单项选择题

When used in conjunction with a turbocharger, the main function of an after-cooler is to （）

A.increase the density of the cylinder air charge
B.prevent turbocharger overheating
C.liminate the need for a pre-cooler
D.remove moisture from air compressed by the turbocharger

单项选择题

One of function of diesel engine lubricating oil is to （）

A.induce carbon formation on cylinder walls
B.improve fuel penetration in the combustion space
C.form a friction reducing film between mating surfaces
D.lubricate the fuel injection