Q. In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?

(A) such a case is practically impossible
(B) slow runner
(C) medium runner
(D) fast runner

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✅ Correct Answer: (B) slow runner

Explanation: considering the velocity diagram of francis turbine at the inlet for a slow runner, we notice that the whirl velocity exceeds the blade velocity along the same direction. they are equal in case of a medium runner.

Published by Mr. Dubey ⭐ 111.54K Points at 19-Sep-2023 08:23 pm in Fluid Mechanics and Machinery

Explanation by: Mr. Dubey

considering the velocity diagram of francis turbine at the inlet for a slow runner, we notice that the whirl velocity exceeds the blade velocity along the same direction. they are equal in case of a medium runner.

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Q. In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?

Explanation by: Mr. Dubey

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