Hydraulics and Fluid Mechanics in ME
The jet ratio is defined as the ratio of the

Diameter of Pelton wheel to the diameter of jet
Velocity of Pelton wheel to the velocity of jet
Velocity of jet to the velocity of Pelton wheel
Diameter of jet to the diameter of Pelton wheel

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

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

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