单项选择题

The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）

A.varying the pump discharge pressure
B.varying the pump return pressure
C.rotation of the pump plunger
D.rotation of the pump barrel

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单项选择题

On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）

A.accumulator spring compressor
B.balance piston
C.compensating needle valve
D.proportional piston

单项选择题

Which of the following adjustments is always required whenever the diesel engine governor oil has been drained and renewed?（）

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单项选择题

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B.Slip is held to a minimum when reversing shaft rotation
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D.It aids in maintaining power factor