单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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