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

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

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Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Diameter of both the pipes is same
Loss of head and discharge of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Length of both the pipes is same

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