Hydraulics and Fluid Mechanics in ME
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

0.5 a. √2gH
0.855 a. √2gH
0.707 a. √2gH
√2gH

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Hydraulics and Fluid Mechanics in ME
The function of guide vanes in a reaction turbine is to

Allow the water to enter the runner without shock
All of the listed here
Allow the water to flow over them, without forming eddies
Allow the required quantity of water to enter the turbine

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