Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To eliminate water hammer possibilities
To regulate flow of water to turbines by providing necessary retarding head of water
All of these
To control the pressure variations due to rapid changes in the pipe line flow

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

To prevent air to enter the turbine
To transport water to downstream
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

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