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單項(xiàng)選擇題

What is the function of the after-cooler installed in the diesel engine air intakes system?（）

A.Decrease the air density
B.Increase the exhaust temperature
C.Decrease the lube oil temperature
D.Increase the air density

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單項(xiàng)選擇題

Which harmful consequence may be the result of lube oil sludge accumulation? （）

A.Clogged oil pump suction screens
B.Increased oil operating temperatures
C.Sticking piston rings
D.All of the above

單項(xiàng)選擇題

High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）

A.improper fuel rack positing
B.lengthy exhaust valve duration
C.extend operation at light load
D.excessively early injection timing

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