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

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

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Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Loss of head and discharge of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Diameter of both the pipes is same
Length of both the pipes is same

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