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


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1.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

2.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

3.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

4.單項(xiàng)選擇題Lubricating oil used in a diesel engine serves to（）

A.reduce the wear of bearing surfaces
B.cool the bearing surfaces
C.assist in sealing bearing surfaces
D.all of the above

5.單項(xiàng)選擇題Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）

A.Non-harmonic speed
B.Critical speed
C.Maximum speed
D.Design maximum speed