Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of a reaction turbine, is the ratio of

Actual work available at the turbine to energy imparted to the wheel
Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
None of these
Power produced by the turbine to the energy actually supplied by the turbine

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Hydraulics and Fluid Mechanics in ME
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is

cannot be predicted from the given data
one-half its value when cylinder was full
zero
one-fourth its value when cylinder was full

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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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