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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

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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

單項選擇題

One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）

A.crankcase
B.cylinder head
C.valve cover
D.engine frame

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