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Which of the following is NOT a type of positive displacement pumps?

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Which of the following is NOT a type of positive displacement pumps?

(a) Reciprocating pump

(b) Rotary displacement pump

(c) Centrifugal pump

(d) None of the mentioned

The question was asked during a job interview.

My doubt stems from Pumps in section Building Blocks of Dairy Processing of Dairy Engineering

1 Answer

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Correct option is (c) Centrifugal pump

Explanation: Centrifugal pump is not a positive displacement pump. Reciprocating pumps move liquid by means of a constant back-and-forth motion of a piston, plunger, or diaphragm within a fixed volume or cylinder. Reciprocating pumps can handle viscous and abrasive fluids. They are low-speed machines when compared with centrifugal and rotary.

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