Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

  • A(w Hm) / (Q × ηo)
  • B(w Hm Q) / ηo
  • C(w Q) / (Hm × ηo)
  • D(w Q ηo) / Hm
Correct Answer : (B)

(w Hm Q) / ηo

Hints :

According to Bernoulli's equation for steady ideal fluid flow


A Francis turbine is used when the available head of water is

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