Mass Transfer

101.Components, having widely different boiling point in a binary mixture, can be separated using _________ distillation.

  1. Molecular
  2. Extractive
  3. Steam
  4. Simple

Correct answer: (D)
Simple

102.Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

  1. 25%
  2. 50%
  3. 70%
  4. 90%

Correct answer: (B)
50%

103.Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid).

  1. p = P
  2. p >>P
  3. p < P
  4. p << P

Correct answer: (A)
p = P

104.Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the _________ number.

  1. Sherwood
  2. Schmidt
  3. Peclet
  4. Stanton

Correct answer: (A)
Sherwood

105.Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _________ number.

  1. Schmidt
  2. Sherwood
  3. Peclet
  4. Stanton

Correct answer: (A)
Schmidt

106.Cox chart is useful in the design of

  1. Distillation column
  2. Evaporator
  3. Dryer
  4. Crystalliser

Correct answer: (A)
Distillation column

107.Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature).

  1. log P vs. T
  2. log P vs. log T
  3. T vs. P
  4. P vs. log T

Correct answer: (A)
log P vs. T

108.Critical humidity of a solid salt means the humidity

  1. Above which it will always become damp
  2. Below which it will always stay dry
  3. Both (A) and (B)
  4. Above Which it will always become dry and below which it will always stay damp

Correct answer: (C)
Both (A) and (B)

109.Danckwerts developed the _________ theory.

  1. Penetration
  2. Surface renewal
  3. Film
  4. None of these

Correct answer: (B)
Surface renewal

110.Deaeration (removal of O2) of water is done by

  1. Rectification
  2. Absorption
  3. Ion-exchange
  4. Adsorption

Correct answer: (C)
Ion-exchange

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