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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Hydraulics and Fluid Mechanics in ME
A floating body is said to be in a state of stable equilibrium

when the metacentre is above the centre of gravity
when its metacentric height is zero
when the metacentre is below the centre of gravity
only when its centre of gravity is below its centre of buoyancy

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