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Doctors Medicines MCQs Q&A

  1. Centrifugal 
  2. Axial Flow
  3. Reciprocating
  4. Mixed Flow
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1 Answers

Option 2 : Axial Flow

Explanation:

Pump Classification based on flow direction through impeller:

  • Radial flow pump: The liquid enters the impeller axially and the head is developed by centrifugal force. The liquid leaves the impeller radially. Such pumps are called radial flow pumps.
  • Axial flow pump: In this, the head is developed by the propelling action of vanes. The liquid enters the impeller axially and also leaves axially. These pumps have very large discharge but a low head.
  • Mixed flow pump: Flow through a mixed flow impeller is a combination of axial and radial flow. The head is developed by the combined action of centrifugal force and propelling action of the impeller. The flow enters axially, not necessarily in the centre, but leaving at some angle between radially and axially.

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Note:

  • The main advantage of an Axial flow pump is that it has a relatively high discharge (flow rate) at a relatively low head.
  • For example, it can pump up to 3 times more water and other fluids at lifts of less than 4 meters as compared to the more common radial - flow or centrifugal pump. They are used by smaller farmers for crop irrigation, drainage, and fisheries.
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