Hydraulics and Fluid Mechanics in ME
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

Lift and drag
Drag and resultant force
Lift and tangential force
Lift and resultant force

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

To run the turbine full
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

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