A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
您可能感興趣的試卷
你可能感興趣的試題
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
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
A pressure drop through the refrigerant liquid line may cause （）.
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 （）.
Thermostatic expansion valves can be adjusted for （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.