單項(xiàng)選擇題Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）

A.starting the engine while hot
B.knurling the piston skirt
C.operating the engine overheated
D.scuff resistant piston rings


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1.單項(xiàng)選擇題Exhaust pipes for separate diesel engines can be combined only when （）

A.space limitations prevent separately run pipes
B.the engines are small auxiliary units
C.they are arranged to prevent gas backflow to each engine
D.a waste heat boiler is installed

2.單項(xiàng)選擇題An increase in crankcase pressure generally indicates（）

A.worn connecting rod bearings
B.worn engine cylinder liners
C.high cylinder firing pressure
D.stuck spring-loaded manhole covers

3.單項(xiàng)選擇題Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）

A.chromium plating piston rings
B.knurling the piston skirt
C.extended maximum power operation
D.applying load to a cold diesel engine

4.單項(xiàng)選擇題If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）

A.liquid in the cylinder
B.low compression in the cylinder
C.high exhaust temperature
D.poor fuel penetration

5.單項(xiàng)選擇題Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

A.amount of scavenge air to the cylinder
B.quality of fuel injected
C.viscosity of the lube oil
D.compression ratio of the piston