單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?()

A.Improper fuel rack positioning
B.Lengthy opening of the exhaust valve
C.Excessively early injection timing
D.Extended light load operation

5.單項(xiàng)選擇題After-cooling of a turbocharged diesel engine will result in ()

A.higher torque but lower brake horsepower
B.lower torque but higher brake horsepower
C.higher torque and lower brake horsepower
D.lower torque and higher brake horsepower

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