Fluid Mechanics
Turbine impeller

Produces only tangential current
Does not produce tangential current
Produces only radial current
Is effective over wide range of viscosities

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

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