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A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.

Correct Answer: 20 r.p.m.

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