Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

None of these
Actual velocity of jet at vena contracta to the theoretical velocity
Actual discharge through an orifice to the theoretical discharge
Area of jet at vena contracta to the area of orifice

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Hydraulics and Fluid Mechanics in ME
Runaway speed of a hydraulic turbine is

The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
The speed at which turbine runner will be damaged
Full load speed
The speed corresponding to maximum overload permissible

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