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

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
Allow the water to enter the runner without shock

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Hydraulics and Fluid Mechanics in ME
In a reaction turbine, the draft tube is used

To increase the head of water by an amount equal to the height of the runner outlet above the tail race
To run the turbine full
To prevent air to enter the turbine
To transport water to downstream

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