单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

What is commonly used to create turbulence in a diesel engine combustion system?（）

A.Shape of the piston crowns
B.Increasing the compression ratios
C.Increasing the piston crowns
D.Increasing the turbocharger gear ratio