Fluid Mechanics
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

Increases linearly with V
None of these
Decreases linearly with V
Decreases as V²

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

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Fluid Mechanics
A stream line is

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

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