Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is the

Ratio of the actual work available at the turbine to the energy imparted to the wheel
Ratio of the work done on the wheel to the energy of the jet
None of these
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To eliminate water hammer possibilities
All of these
To control the pressure variations due to rapid changes in the pipe line flow
To regulate flow of water to turbines by providing necessary retarding head of water

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