Which of the following is true?
DSSSB JE - 2023,
Answer: A
Specific speed rises from impulse to reaction turbines and with the flow rate. The Pelton wheel has the lowest specific speed (a high head, low flow machine), the Francis turbine is in the medium range, and the Kaplan turbine has the highest, being used for low heads and large discharges. So the Francis specific speed is less than that of the Kaplan turbine. The options that put Kaplan below Francis or below Pelton, or Francis below Pelton, reverse this order.
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