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
The hydraulic efficiency of an impulse turbine is the

Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
Ratio of the work done on the wheel to the energy of the jet
None of these
Ratio of the actual work available at the turbine to the energy imparted to the wheel

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