Fluid Mechanics
In deriving Bernoulli's equation, fluid is assumed to be

Steady, density being pressure dependent, frictionless
None of these
Incompressible, frictionless, steady, along a streamline
Uniform, steady, incompressible, along a streamline

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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

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

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