單項(xiàng)選擇題The () pump discharges a nearly constant amount of liquid regardless of pressure.

A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement


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2.單項(xiàng)選擇題

Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?()
(1) gear
(2) centrifugal
(3) screw

A.(1)and(2)
B.(1),(2)and(3)
C.(1)and(3)
D.(2)and(3)

3.單項(xiàng)選擇題Attempts are made to eliminate axial thrust in centrifugal pump by ().

A.providing the impeller with balancing holes
B.the use of symmetrical impeller
C.neither A nor B
D.either A or B

4.單項(xiàng)選擇題The amount of fluid delivered by a gear pump can be regulated by ().

A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is true