Fluid Mechanics
While starting a centrifugal pump, its delivery valve should be kept

Either opened or closed; depending on the fluid viscosity
Either opened or closed ; it does not make any difference
Opened
Closed

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

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