A.rate of doing work
B.amount of force needed to overcome friction
C.amount of work accomplished
D.distance through which an object is moved
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A.re-adjust the discharge pressure
B.clean the expansion valve screen
C.add refrigerant
D.adjust the expansion valve
A.splash method
B.mechanical force feed lubricators
C.detached sump method
D.internal cooling passages in the crankshafts and connecting rods
A.change the expansion valve adjustment
B.readjust the water regulating valve to increase the flow of water
C.purge air from the condenser
D.clean the waterside of the condenser
A.the pump over-speeding
B.an improper rudder response
C.bubbles in the sight glass
D.ram relief valves lifting
A.smoother pump operation
B.overheating of the bearing
C.reduced corrosion in the bearing
D.increased pump capacity
最新試題
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The usual symptoms of cavitation in a centrifugal pump is （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A pressure drop through the refrigerant liquid line may cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A grease gun is generally used to lubricate a （）.
Which of the listed pumps is NOT a positive displacement pump?（）
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
One cause of high head pressure occurring in a refrigeration system can be （）.