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

To prevent air to enter the turbine
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

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Hydraulics and Fluid Mechanics in ME
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

It is not possible to conduct this experiment with any other tube
It is easier to see through the glass tube
Glass tube is cheaper than a metallic tube
All of these

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Hydraulics and Fluid Mechanics in ME
The flow ratio of Francis turbine is defined as the ratio of the

Theoretical velocity of jet to the velocity of flow at inlet
Velocity of runner at inlet to the velocity of flow at inlet
None of these
Velocity of flow at inlet to the theoretical jet velocity

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