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

The velocity of flow is large
The size of orifice is large
The available head of liquid is more than 5 times the height of orifice
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 function of guide vanes in a reaction turbine is to

Allow the required quantity of water to enter the turbine
Allow the water to enter the runner without shock
All of the listed here
Allow the water to flow over them, without forming eddies

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