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

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

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

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

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