單項選擇題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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1.單項選擇題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

2.單項選擇題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

5.單項選擇題Lube oil in the fresh water cooling system of a diesel engine may result from a ()

A.camshaft seizure
B.lube oil pump failure
C.lube oil cooler failure
D.lube oil pump overflow