A.injection valve
B.relief valve
C.discharge valve
D.inlet filter
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A.gear
B.vane
C.screw
D.centrifugal
A.low pressure
B.low discharge
C.low speed
D.high pressure
A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow
A.Reciprocating pumps
B.Rotary pumps
C.Centrifugal pumps
D.Gear pumps
A.interlocked
B.interconnected
C.interfered
D.interacted
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
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 （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
When the steering gear is in operation, you should （）.
A salinity indicator is used to determine the （）.
A pressure drop through the refrigerant liquid line may cause （）.