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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Hydraulics and Fluid Mechanics in ME
Venturimeter is used to

Measure the velocity of a flowing liquid
Measure the pressure difference of liquid flowing between two points in a pipe line
Measure the pressure of a flowing liquid
Measure the discharge of liquid flowing in a pipe

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