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

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
To transport water to downstream
To run the turbine full

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

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

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