Fluid Mechanics
Foot valves are provided in the suction line of a centrifugal pump to

Avoid priming, every time we start the pump
Remove the contaminant present in the liquid
Minimise the fluctuation in discharge
Control the liquid discharge

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Is zero at the wall and increases linearly to the centre
Remains constant over the cross-section
Varies parabolically across the cross-section
Is zero at the centre and varies linearly with the radius

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