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Propellers are____________________?
  • (A)  Axial flow mixers
  • (B)  Low speed impeller
  • (C)  Used for mixing liquids of high viscosity
  • (D)  Radial flow mixers
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 × 103 VOM + 10.94 × 106 V2 OM (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 ?
  • (A)  0.2
  • (B)  0.5
  • (C)  0.7
  • (D)  0.8