Mass Transfer MCQs with answers Page - 20

Here, you will find a collection of MCQ questions on Mass Transfer. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. During constant rate period, the rate of drying decreases with the

  • (A) Decrease in air temperature
  • (B) Increase in air humidity
  • (C) Both (A) and (B)
  • (D) Neither (A) nor (B)

A

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Q. At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

  • (A) 90
  • (B) 91.5
  • (C) 95
  • (D) 99

A

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

  • (A) Azeotropic mixture is to be separated and the final product is miscible with water
  • (B) Liquids decompose, if distilled directly at atmospheric pressure
  • (C) Material cannot be distilled by indirect heating even under low pressure, because of the high boiling temperature
  • (D) Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

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Q. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

  • (A) 15 min
  • (B) 51 min
  • (C) 71 min
  • (D) 94 min

A

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Q. In Azeotropic mixture, the equilibrium vapour composition is

  • (A) More than liquid composition
  • (B) Less than liquid composition
  • (C) Same as liquid composition
  • (D) Independent of pressure

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Q. In rectifying section of a continuous distillation column, the

  • (A) Vapour is enriched with low boilers
  • (B) Vapour is enriched with high boilers
  • (C) Liquid is stripped of high boilers
  • (D) None of these

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

  • (A) Low pressure drop and high hold up
  • (B) High pressure drop and low hold up
  • (C) Low pressure drop and low hold up
  • (D) High pressure drop and high hold up

A

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Q. Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

  • (A) 2
  • (B) 8
  • (C) 12
  • (D) 18

A

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Q. The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

  • (A) Plug
  • (B) Perfectly mixed
  • (C) Both (A) & (B)
  • (D) Neither (A) nor (B)

A

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Q. Plate efficiency

  • (A) Is a function of the mass transfer between liquid and vapour
  • (B) Increases due to foaming
  • (C) Increases due to liquid entrainment
  • (D) Increases due to weeping and dumping of liquid

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