Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

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
Loss of head in the orifice to the head of water available at the exit of the orifice

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

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

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