Hydraulics and Fluid Mechanics in ME
The Bernoulli's equation is based on the assumption that

All of these
There is no loss of energy of the liquid flowing
No force except gravity acts on the fluid
The velocity of flow is uniform across any cross-section of the pipe

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

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
Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena-contracta to the theoretical velocity

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