题目内容

Gear pumps are of positive displacement type pumps because they discharge a near constanamount of liquid( )pressure.

A. depending on
B. in relative to
C. regardless of
D. because of

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A reciprocating pump belongs to( )according to its working principle.

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

A/An( )pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.

A. injector
B. positive displacement
C. centrifugal
D. centripetal

Which of the listed pumps is NOT a positive displacement pump?( )

A. Centrifugal pump.
B. Reciprocating pump.
C. Gear pump.
D. Rotary pump.

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