Hydraulics and Fluid Mechanics in ME
A differential manometer is used to measure

Atmospheric pressure
Pressure in Venturimeter
Difference of pressures between two points in a pipe
Pressure in pipes and channels

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

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

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