單項(xiàng)選擇題

If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

A.a broken shaft on the freshwater pump
B.an excessive accumulation of scale exchanger
C.an incorrect thermostatic element operating range
D.lube oil in the cooling water

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

你可能感興趣的試題

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

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