Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The size of orifice is large
The available head of liquid is more than 5 times the height of orifice
The velocity of flow is large
The available head of liquid is less than 5 times the height of orifice

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Hydraulics and Fluid Mechanics in ME
The total head of a liquid particle in motion is equal to

Potential head - (pressure head + kinetic head)
Kinetic head - (pressure head + potential head)
Pressure head - (kinetic head + potential head)
Pressure head + kinetic head + potential head

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Hydraulics and Fluid Mechanics in ME
The Euler's equation for the motion of liquids is based upon the assumption that

The velocity of flow is uniform over the section
The fluid is non - viscous, homogeneous and incompressible
The flow is continuous, steady and along the stream line
All of these

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