Hydraulics and Fluid Mechanics in ME
The vapour pressure over the concave surface is

zero
less man the vapour pressure over the plane surface
equal to the vapour pressure over the plane surface
greater than the vapour pressure over the plane surface

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

To transport water to downstream
To run the turbine full
To increase the head of water by an amount equal to the height of the runner outlet above the tail race
To prevent air to enter the turbine

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