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

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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

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