Hydraulics and Fluid Mechanics in ME
The angle of contact in case of a liquid depends upon

both of die above
the nature of the liquid and the solid
the material which exists above the free surface of the liquid
any one of the above

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To eliminate water hammer possibilities
To regulate flow of water to turbines by providing necessary retarding head of water
All of these
To control the pressure variations due to rapid changes in the pipe line flow

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