Mass Transfer

601.Which of the following unit operations makes use of Thiele-Geddes equation?

  1. Liquid-liquid extraction
  2. Solid-liquid extraction
  3. Multi-component absorption with chemical reaction
  4. Multi-component distillation

Correct answer: (D)
Multi-component distillation

602.Which of these columns incurs the lowest pressure drop?

  1. Packed column (with stacked packing)
  2. Packed column (with dumped packing)
  3. Bubble plate column
  4. Pulse column

Correct answer: (A)
Packed column (with stacked packing)

603.Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes?

  1. Packed towers
  2. Plate towers
  3. Spray towers
  4. Wetted wall columns

Correct answer: (D)
Wetted wall columns

604.With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

  1. Increases
  2. Decreases
  3. Remain same
  4. May increase or decrease; depends on individual design

Correct answer: (A)
Increases

605.With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature).

  1. Increases
  2. Remains unchanged
  3. Decreases
  4. Decreases linearly

Correct answer: (A)
Increases

606.With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

  1. Increases
  2. Decreases
  3. Decreases linearly
  4. Remains unaffected

Correct answer: (A)
Increases

607.With increase in pressure, the relative volatility for a binary system

  1. Increases
  2. Decreases
  3. Remains same
  4. Either (A) or (B), depends on the system

Correct answer: (B)
Decreases

608.With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

  1. Increases
  2. Decreases
  3. Decreases linearly
  4. Remain unaffected

Correct answer: (B)
Decreases

609.With increase in temperature, the leaching rate increases because of the

  1. Increased diffusivity
  2. Decreased viscosity of liquid
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

610.With increase in temperature, the leaching rate increases due to

  1. Decreased liquid viscosity
  2. Increased diffusivity
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

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