Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

Could be above or below e.g. depending on density of body and liquid
Below be centre of gravity
At the centre of gravity
Above the centre of gravity

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

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

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