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

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Hydraulics and Fluid Mechanics in ME
The Euler's equation for the motion of liquids is based upon the assumption that

The fluid is non - viscous, homogeneous and incompressible
The velocity of flow is uniform over the section
All of these
The flow is continuous, steady and along the stream line

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Hydraulics and Fluid Mechanics in ME
Two dimensional flows occurs when

The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The magnitude and direction of the velocity do not change from point to point in the fluid
The velocity of successive fluid particles, at any point, is the same at successive periods of time
The direction and magnitude of the velocity at all points are identical

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