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

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To eliminate water hammer possibilities
To regulate flow of water to turbines by providing necessary retarding head of water
All of these
To control the pressure variations due to rapid changes in the pipe line flow

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