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 transport water to downstream
To prevent air to enter the turbine

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The available head of liquid is more than 5 times the height of orifice
The available head of liquid is less than 5 times the height of orifice
The velocity of flow is large
The size of orifice is large

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