As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are

Kaplan, Francis, Pelton
Pelton, Francis, Kaplan
Francis, Kaplan, Pelton
Pelton, Kaplan, Francis

Correct answer: Kaplan, Francis, Pelton

Solution

Kaplan turbines are designed for high flow rates and low head, making them suitable for large volumes of water. Francis turbines can handle moderate flow rates and heads, while Pelton turbines are used for high heads and low flow rates, thus placing them in descending order of flow rate.

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