Mass Transfer

481.The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an _________ law.

  1. Exponential
  2. Parabolic
  3. Linear
  4. Cubic

Correct answer: (A)
Exponential

482.The percentage humidity is less than the relative humidity only at _________ percent humidity.

  1. Zero
  2. Hundred
  3. Both zero and hundred
  4. None of these

Correct answer: (C)
Both zero and hundred

483.The process employing desorption of the absorbed solute by a solvent is called

  1. Elution
  2. Osmosis
  3. Reverse osmosis
  4. Sublimation

Correct answer: (A)
Elution

484.The rate of mass transfer is not dependent upon the

  1. Degree of dispersion of one fluid in the other
  2. Interfacial surface exposed between the phases
  3. Both (A) & (B)
  4. None of these

Correct answer: (D)
None of these

485.The rate of solid-liquid extraction is limited by the

  1. Phase change of the solute as it dissolves in the solvent
  2. Diffusion of the solute through the solvent in the pores to the outside of the particle
  3. Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
  4. All 'a', 'b' & 'c'

Correct answer: (D)
All 'a', 'b' & 'c'

486.The ratio of Murphree plate efficiency to point efficiency is 1 in a _________ flow model.

  1. Plug
  2. Perfectly mixed
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (B)
Perfectly mixed

487.The ratio of Murphree plate efficiency to point efficiency is always > 1 in a _________ flow model.

  1. Plug
  2. Perfectly mixed
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (A)
Plug

488.The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

  1. Low pressure drop and high hold up
  2. High pressure drop and low hold up
  3. Low pressure drop and low hold up
  4. High pressure drop and high hold up

Correct answer: (C)
Low pressure drop and low hold up

489.The reciprocal of stripping factor is termed as

  1. Selectivity index
  2. Relative volatility
  3. Absorption factor
  4. Murphree efficiency

Correct answer: (C)
Absorption factor

490.The recovery of penicillin from the acidified fermentation broth is done by

  1. Distillation
  2. Evaporation
  3. Absorption
  4. Liquid extraction

Correct answer: (D)
Liquid extraction

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