Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) ________________?
Correct answer: D. N3D5
- A. N2D3
- B. ND2
- C. N2D
- D. N3D5
Explanation
From the pump affinity laws, flow varies as ND³ and head as N²D²; power, being proportional to flow multiplied by head, varies as N³D⁵.
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