Fluid Mechanics MCQs

157. 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, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?

0.2
0.5
0.7
0.8
✅ The correct answer is option C.

159. A perfect gas

Does not satisfy PV = nRT
Is incompressible and has zero viscosity
Has constant specific heat
Can’t develop shear stresses
✅ The correct answer is option C.
Scroll to Top