单项选择题

When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）

A.Quantity of fuel injected tends to be decreased
B.Quantity of fuel injected will always be increased
C.Start of injection tends to be advanced
D.Duration of injection will always greater

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单项选择题

A properly honed diesel engine cylinder liner will（）

A.prevent piston ring wear
B.shorten the ring break-in period
C.prevent cylinder liner glazing
D.appear slick and glazed

单项选择题

A diesel engine is supercharged in order to（）

A.lower the no-load RPMs
B.provide more air for combine with the fuel
C.increase the no-load RPMs
D.provide more fuel combine with the air

单项选择题

Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）

A.high firing pressure
B.overload of that particular cylinder
C.smoky exhaust
D.cooling water temperature rise