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

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

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Fluid Mechanics
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter
Venturimeter incurs less power loss compared to an equivalent orificemeter
Venturimeter occupies less space than an orificemeter
For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter

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Fluid Mechanics
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is

24 mm/s
16 mm/s
12 mm/s
28 mm/s

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