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

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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?
A.	such a case is practically impossible
B.	slow runner
C.	medium runner
D.	fast runner
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.

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