單項選擇題

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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單項選擇題

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

單項選擇題

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

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