A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps
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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
最新試題
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
When the steering gear is in operation, you should （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A pressure drop through the refrigerant liquid line may cause （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A salinity indicator is used to determine the （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The general purpose of a heat exchanger is to （）.
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