A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be _____________ hp?
Correct answer: A. 0.5
- A. 0.5
- B. 2
- C. 4
- D. 1
Explanation
For geometrically similar centrifugal-pump operation, power varies with the cube of speed, P ∝ N³. Halving the speed therefore reduces 4 hp to 4(1/2)³ = 0.5 hp.
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