Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
Increase the residence time of the solid
None of these
✅ The correct answer is option A.
Chemical Engineering MCQs
Molecular seives are regenerated by heating to __________ °C.
< 150
200-330
> 500
> 1000
✅ The correct answer is option B.
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
Operating
Total
Minimum
Maximum permissible
✅ The correct answer is option B.
Separation of __________ employs gaseous diffusion process.
N₂ and O₂ from air
Isotopes of uranium
Isotopes of helium
SO₂ and air
✅ The correct answer is option B.
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as
D ∝ T
D ∝ T0.5
D ∝ T1.5
D ∝ T2
✅ The correct answer is option C.
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)
F/(FG.a)
FG/(G.a)
(G.a)/FG
L/(FG.G)
✅ The correct answer is option A.
The McCabe Δ L law states that the
Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the crystal size
✅ The correct answer is option C.
If a two phase system is in physical equilibrium; then it means that, the
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Temperature of the liquid phase is equal to that of the vapor phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of the above
✅ The correct answer is option D.
As per Gilliland’s equation, the diffusivity is
Directly proportional to ‘T1.5’
Inversely proportional to ‘P’
Dependent on the molecular volume & molecular weight of components
All of the above
✅ The correct answer is option D.
Molecular seives are porous
Alumina
Silica
Synthetic zeolites crystals/metal alumino-silicates
None of these
✅ The correct answer is option C.