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

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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

單項選擇題

When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）

A.insufficient lubrication
B.improper piston cooling
C.blow-by
D.overload operation

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

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

When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）