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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1.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

2.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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Which of the following statements represents an advantage of an electromagnetic clutch?()

A.Large misalignments can be tolerated between the shaft and engine coupling
B.Slip is held to a minimum when reversing shaft rotation
C.Engine torsion vibrations to the driven shaft are eliminated
D.It aids in maintaining power factor