Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Actual discharge through an orifice to the theoretical discharge
None of these
Area of jet at vena contracta to the area of orifice
Actual velocity of jet at vena contracta to the theoretical velocity

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

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
total drag is zero

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Hydraulics and Fluid Mechanics in ME
The hammer blow in pipes occurs when

There is excessive leakage in the pipe
The pipe bursts under high pressure of fluid
The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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