A.centrifugal
B.plunger
C.injector
D.water
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A.discharges into a gradually widening channel
B.has stationary diffuser vanes
C.produces no kinetic energy
D.All of the above are true
A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
A.pump entry branch
B.outlet pipe
C.impeller
D.None of the above is true
A.to fill 2 tanks at the same time
B.to use pump at a higher pressure
C.to return liquid to suction side if discharge valve is closed
D.All of the above are true
A.injector
B.positive displacement
C.centrifugal
D.centripetal
最新試題
When the steering gear is in operation, you should （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The major source of chemical contaminants in hydraulic fluid is （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A salinity indicator is used to determine the （）.
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 （）.