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

In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity? Correct Answer Slow Runner

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.
Bissoy MCQ

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