單項選擇題The amount of fluid delivered by a screw 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 tree


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1.單項選擇題A screw pump belongs to () according to its working principle.

A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps

3.單項選擇題In a () the center screw is driven and the outer screws idle.

A.single screw pump
B.double-screw pump
C.triple screw pump
D.centripetal pump

4.單項選擇題The discharge flow of a reciprocating pump is ().

A.steady
B.in pulsation
C.continuous
D.large