單項選擇題

A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）

A.decrease only
B.increase only
C.decrease slightly then returned to original speed
D.increase slightly then returned to original speed

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單項選擇題

The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）

A.speed, torque, and horsepower production
B.firing order, valve timing, and valve lift
C.fuel consumption, efficiency, and cylinder pressure
D.scavenge pressure, compression ratio, and exhaust pressure

單項選擇題

Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）

A.maintain low pH in the cooling water
B.reduce the cooling water temperature
C.increase cooling water hardness
D.form a protective film on metal surfaces