單項選擇題Through a () pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

A.positive displacement
B.ejector
C.centrifugal
D.air compressor


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1.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

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

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

4.單項選擇題The pressure head of a pump is given in the unit of ().

A.kg
B.MPa
C.meter fluid column
D.None of the above is true

5.單項選擇題A gear pump belongs to () according to its working principle.

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