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, then the new head will be ______________ metres?
Correct answer: A. 2
- A. 2
- B. 4
- C. 8
- D. 5.5
Explanation
For geometrically similar centrifugal pumps, head varies as the square of speed: H₂/H₁ = (N₂/N₁)². Halving the speed therefore gives H₂ = 8(1/2)² = 2 m.
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