單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which()

A.has a crown-face
B.exceeds wear limits through normal wear
C.has excessive blow-by
D.is in good condition

5.單項(xiàng)選擇題A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates()

A.combustion gas blow-by
B.excessive lubrication
C.properly functioning rings
D.insufficient cylinder cooling