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 prevent air to enter the turbine
To transport water to downstream

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Hydraulics and Fluid Mechanics in ME
In case of flow through parallel pipes,

The total discharge is equal to the sum of discharges in the various pipes
The head loss for all the pipes is same
Both (A) and (B)
The total head loss is the sum of head losses in the various pipes

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Hydraulics and Fluid Mechanics in ME
The specific speed of turbine is defined as the speed of a unit

Of such a size that it produces unit horse power with unit head
Of such a size that it delivers unit discharge at unit power
Of such a size that it requires unit power per unit head
Of such a size that it delivers unit discharge at unit head

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