Hydraulics and Fluid Mechanics in ME
Buoyant force is

The resultant force acting on a floating body
The resultant force on a body due to the fluid surrounding it
The force necessary to maintain equilibrium of a submerged body
Equal to the volume of liquid displaced

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

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