Fluid Mechanics
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

Discharge pressure
Flow of liquid during operation of the pump
All of these
Back flow of fluid in the event of stoppage of pump

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Fluid Mechanics
A stream line is

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

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