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Which among the following is not a positive displacement pump?

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+2 votes
in Fluid Mechanics by (118k points)
Which among the following is not a positive displacement pump?

(a) Centrifugal

(b) Reciprocating

(c) Rotary

(d) Ionization pump

The question was posed to me in a job interview.

This intriguing question comes from Maximum Speed of a Reciprocating Pump topic in chapter Indicator Diagrams of Fluid Mechanics

1 Answer

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by (362k points)
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Best answer
Correct option is (a) Centrifugal

The best I can explain: Centrifugal pumps are not a positive displacement pump. They are a subclass dynamic work absorbing turbo machinery. They are used to transport fluids. It transports fluid by conversion of rotational kinetic energy to hydrodynamic kinetic energy.

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