Mass Transfer MCQs with answers Page - 27

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. Which of the following parameters remains constant during chemical dehumidification?

  • (A) Dry bulb temperature
  • (B) Partial pressure of vapour
  • (C) Wet bulb temperature
  • (D) None of these

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Q. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower)

  • (A) G/(FG . a)
  • (B) FG/(G . a)
  • (C) (G . a)/FG
  • (D) L/(FG . G)

A

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Q. Coffee is prepared from coffee beans by leaching with

  • (A) Cold water
  • (B) Hot water
  • (C) Dilute hot caustic solution
  • (D) Naphtha

A

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Q. Pore size of the molecular sieve 5A is __________ mm.

  • (A) 5
  • (B) 0.5
  • (C) 0.05
  • (D) 50

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Q. To remove all the moisture from a wet solid it requires exposure to __________ air.

  • (A) Perfectly dry
  • (B) Highly humid
  • (C) High temperature
  • (D) None of these

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Q. The cooling effect in a cooling tower can be speeded up by

  • (A) Increasing the air velocity and area of exposed wet surface
  • (B) Reducing the barometric pressure
  • (C) Reducing the humidity of the air
  • (D) All (A), (B) and (C)

A

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Q. The relative volatility of a binary mixture at the Azeotropic composition is

  • (A) 1
  • (B) > 1
  • (C) 0
  • (D) ∞

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Q. Which of the following processes is not an example of adsorption applied to gaseous separations?

  • (A) Recovery of valuable solvent vapors from dilute mixture with air and other gases
  • (B) Dehumidification of air and gas
  • (C) Removal of objectionable odour and impurities from industrial gases
  • (D) Decolouration of yellow glycerine

A

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Q. For absorbing a sparingly soluble gas in a liquid, the

  • (A) Gas side co-efficient should be increased
  • (B) Liquid side coefficient should be increased
  • (C) Gas side co-efficient should be decreased
  • (D) Liquid side co-efficient should be decreased

A

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Q. The Knudsen diffusivity is proportional to (where, T = absolute temperature)

  • (A) √T
  • (B) T2
  • (C) T
  • (D) T4

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