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

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Hydraulics and Fluid Mechanics in ME
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

The metal piece will simply float over the mercury
The metal piece will be immersed in mercury by half
Whole of the metal piece will be immersed with its top surface just at mercury level
Metal piece will sink to the bottom

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