Which one of the following pump is not a positive displacement pump?

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ISRO VSSC Technical Assistant Mechanical 14 July 2021 Official Paper
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  1. Reciprocating pump
  2. Centrifugal pump
  3. Vane pump
  4. Gear pump

Answer (Detailed Solution Below)

Option 2 : Centrifugal pump
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Detailed Solution

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Explanation:

Positive displacement pump:

  • Positive displacement pumps are those pumps in which the liquid is sucked and then it is pushed or displaced to the thrust exerted on it by a moving member, which results in lifting the liquid to the required height.
  • Reciprocating pump, Vane pump, Lobe pump are the examples of positive displacement pump whereas the centrifugal pump is the non-positive displacement pump.​

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