单项选择题
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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相关考题
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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 -
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?（）
A.speed droop
B.compensation
C.idle speed setting
D.load limit control
