A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
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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
A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps
A.the mechanical seal
B.packed stuffing boxes
C.either A or B
D.neither A nor B
As for a hydraulic vane pump, which of the following is in contact with the vanes during working: ()
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing
A.(1) only
B.(2) only
C.(1) and (2)
D.(1),(2)and(3)
A.circular
B.elliptical
C.rectangular
D.hexagon
A.suction
B.exhaust
C.pressure
D.discharge
A.draw the liquid in;force the liquid out
B.force the liquid out;draw the liquid in
C.suction;draw
D.deliver;outlet
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
最新试题
The usual symptoms of cavitation in a centrifugal pump is ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
The output volume of a positive fixed displacement pump can be changed only by ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
A salinity indicator is used to determine the ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used 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?()