單項選擇題

The primary purpose of oil control rings on a diesel piston is to（）

A.provide a reservoir for cylinder lubrication
B.pump oil into the combustion space for cylinder cooling
C.prevent excessive lubricating oil consumption
D.allow hydraulic oil film formation on the cylinder

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單項選擇題

The purpose of compressing the air within the cylinder of a diesel engine is to （）

A.produce the heat for ignition
B.decrease injection lag
C.increase ignition delay
D.aid in exhausting burnt gases

單項選擇題

A smoking exhaust from an operating diesel engine could be caused by （）

A.low sulfur content in the fuel
B.a loose injector inlet connection
C.late fuel injection
D.high injection pressure

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