Fluid Mechanics
Unsteady non-uniform flow is represented by flow through a/an

Long pipe at decreasing rate
Expanding tube at constant rate
Expanding tube at increasing rate
Long pipe at constant rate

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

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

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Fluid Mechanics
The Prandtl mixing length is

Independent of the shear stress
Zero at the pipe wall and is a universal constant
Independent of radial distance from the pipe axis
Useful for computing laminar flow problems

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Fluid Mechanics
A stream line is

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

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