How does the flow ratio (ψ) of a Francis turbine vary with available – McqOptions

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1.	How does the flow ratio (ψ) of a Francis turbine vary with available head (H)?
A.	ψ α H
B.	ψ α 1/H
C.	ψ α sqrt (H)
D.	ψ α 1/(sqrt (H))
Answer» E.

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