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單項選擇題

A fuel injection valve opening at pressure lower than normal will result in（）.

A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector

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單項選擇題

In a diesel engine, exhaust valves open before the intake ports are uncovered to （）
Ⅰ.reduce pumping losses
Ⅱ.reduce back pressure

A.Ⅰonly
B.Ⅱonly
C.bothⅠand Ⅱ
D.neitherⅠnor Ⅱ

單項選擇題

Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）

A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser

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