Hydraulics and Fluid Mechanics in ME
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if

The area is vertical
All of these
The area is inclined
The area is horizontal

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

Power produced by the turbine to the energy actually supplied by the turbine
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
None of these

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