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

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena contracta to the area of orifice
None of these
Actual discharge through an orifice to the theoretical discharge

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