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

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
The velocity of flow is large
The size of orifice is large

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Hydraulics and Fluid Mechanics in ME
The kinematic viscosity is the

Ratio of absolute viscosity to the density of the liquid
Product of absolute viscosity and density of the liquid
Ratio of density of the liquid to the absolute viscosity
Product of absolute viscosity and mass of the liquid

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