單項選擇題The best tool to use for removing the carbon ridge at the top of an enginecylinder, prior to removing the piston, is to use（）

A.an electric grinder
B.a metal scraper
C.a reamer
D.a three-wing hone


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1.單項選擇題Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）

A.Faulty turbocharger turbine diffuser ring
B.Faulty turbocharger compressor ring
C.Insufficient cooling water flow
D.Clogged air intake filters

2.單項選擇題Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）

A.Excessive piston blow-by to the manifold
B.Insufficient cooling water flow
C.Accumulated water in the air boxes
D.Clogged air intake filters

3.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

4.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

5.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