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

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

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Hydraulics and Fluid Mechanics in ME
When a liquid is flowing through a pipe, the velocity of the liquid is

Maximum at the centre and minimum near the walls
Minimum at the centre and maximum near the walls
Maximum at the centre and zero near the walls
Zero at the centre and maximum near the walls

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