單項選擇題

If sludge accumulates on the underside of a diesel engine piston, it will（）

A.cause blow-by
B.chemically attack the piston skirt
C.form an emulsion of lube oil and water
D.raise the piston temperature

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單項選擇題

Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?（）

A.An increased air temperature differential between the cooler inlet and outlet
B.A decrease in the air pressure differential across the cooler
C.Excessive condensate forming in the air box
D.A decrease in the air temperature differential between the cooler inlet and outlet

單項選擇題

Black areas on the sealing surfaces of piston rings indicate（）

A.lube oil pumping
B.rotating rings
C.gas pressure behind the ring
D.passage of hot gases