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

Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena-contracta to the theoretical velocity
Loss of head in the orifice to the head of water available at the exit of the orifice
Area of jet at vena-contracta to the area of orifice

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

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

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