Mass Transfer

411.Solvent used in extractive distillation

  1. Is of low volatility
  2. Forms a low boiling azeotrope
  3. Forms a high boiling azeotrope
  4. Does not alter the relative volatility of the original components

Correct answer: (B)
Forms a low boiling azeotrope

412.Stacked packing compared to dumped packing

  1. Provides poorer contact between the fluids
  2. Gives lower pressure drop
  3. Both (A) and (B)
  4. Gives higher pressure drop

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

413.Steady state equimolal counter diffusion is encountered in

  1. Separation of a binary mixture by distillation
  2. Absorption of NH3 from air by water
  3. All liquid-liquid diffusion systems
  4. All liquid-solid diffusion systems

Correct answer: (A)
Separation of a binary mixture by distillation

414.Steady state equimolal counter diffusion occurs in case of

  1. Leaching
  2. Absorption
  3. Binary phase distillation
  4. Liquid-liquid extraction

Correct answer: (C)
Binary phase distillation

415.Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the _________ temperature.

  1. Dry-bulb
  2. Wet-bulb
  3. Dew point
  4. Adiabatic saturation

Correct answer: (B)
Wet-bulb

416.Steam distillation is not recommended to be used, if the

  1. Azeotropic mixture is to be separated and the final product is miscible with water
  2. Liquids decompose, if distilled directly at atmospheric pressure
  3. Material cannot be distilled by indirect heating even under low pressure, because of the high boiling temperature
  4. Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

Correct answer: (A)
Azeotropic mixture is to be separated and the final product is miscible with water

417.Steam distillation is used for separation of high boiling

  1. Substances from non-volatile impurities
  2. Volatile impurity from still higher boiling substances
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

418.Steam distillation is used to

  1. Reduce the number of plates
  2. Avoid thermal decomposition of a component
  3. Increase the efficiency of separation
  4. Increase the total pressure of distillation

Correct answer: (B)
Avoid thermal decomposition of a component

419.Stefan's law describes the mass transfer by

  1. Diffusion
  2. Bulk flow
  3. Both 'a' & 'b'
  4. Neither 'a' nor 'b'

Correct answer: (C)
Both 'a' & 'b'

420.Sticky material can be dried in a _________ dryer.

  1. Tray
  2. Rotary
  3. Fluidised bed
  4. None of these

Correct answer: (A)
Tray

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