Question: A Pelton wheel with a needle - controlled nozzle develops 1 0 5 0 kW against a gross head of 3 0 0 m .

A Pelton wheel with a needle-controlled nozzle develops 1050 kW against a gross head of 300 m. The loss of head due to friction in the pipeline and the nozzle is 92V, where V is the flow rate in m3/s. Assuming that the overall efficiency of the wheel remains constant, determine the percentage reduction in flow rate required when the power developed is reduced to 710 kW by closing a valve on the pipeline partially.

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