Topic: Fluid Machinery
The specific speed of a centrifugal pump, delivering 1000 litres of water per second against a head of 16 metre at 800 rpm
- A. 50 rpm
- B. 100 rpm
- C. 150 rpm
- D. 200 rpm
Answer: B. 100 rpm
Explanation: Specific speed of centrifugal pump Ns = N*$\sqrt{Q}$ / H^(3/4) = 800 * $\sqrt{1000 * 10^-3}$ / 16^(3/4) = 100 rpm.