单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A.Impeller
B.Compressor
C.After-cooler
D.Exhaust differ
