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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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

total drag is zero
lowest pressure intensity occurs at front stagnation point
lowest pressure intensity occurs at rear stagnation point
highest intensity of pressure occurs around the circumference at right angles to flow

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