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

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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

单项选择题

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
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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