Fluid Mechanics
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is

< Δp
Δp
> Δp
Δp²

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

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

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