Fluid Mechanics
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

Fluid velocity in the pipe
Time taken to close the valve
All of these
Pipe length

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Fluid Mechanics
A stream line is

Drawn normal to the velocity vector at every point
A line connecting the mid points of flow cross-section
Always the path of particle
Fixed in space in steady flow

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