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Question
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)
Options:
A .  (w Hm) / (Q × ηo)
B .  (w Hm Q) / ηo
C .  (w Q) / (Hm × ηo)
D .  (w Q ηo) / Hm
Answer: Option B

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