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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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

lowest pressure intensity occurs at rear stagnation point
total drag is zero
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at front stagnation point

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