Mass Transfer MCQs with answers Page - 23

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Q. Flash distillation is suitable for the separation of components

  • (A) Having very close boiling points
  • (B) Which form maximum boiling azeotrope
  • (C) Having very wide boiling points
  • (D) Which form minimum boiling azeotrope

A

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Q. The McCabe ΔL law states that the

  • (A) Molar heats of vaporisation of components are nearly equal
  • (B) Linear crystal growth rate depends on the degree of super-saturation
  • (C) Linear crystal growth rate does not depend on the crystal size
  • (D) Linear crystal growth rate depends on the crystal size

A

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Q. When both the fluids flow concurrently in an absorber, the slope of the operating line is

  • (A) -ve
  • (B) +ve
  • (C) 1
  • (D) -1

A

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Q. Steam distillation is used for separation of high boiling

  • (A) Substances from non-volatile impurities
  • (B) Volatile impurity from still higher boiling substances
  • (C) Both (A) and (B)
  • (D) Neither (A) nor (B)

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Q. The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.

  • (A) Reducing the total pressure
  • (B) Increasing the total pressure
  • (C) Reducing the temperature
  • (D) Both (B) and (C)

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Q. Pick out the correct statement.

  • (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation
  • (B) A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn
  • (C) Solvent used in extractive distillation should be of high volatility
  • (D) Flash distillation is suitable for separating components which have very close boiling temperature

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Q. Pick out the wrong statement.

  • (A) Constant pressure distillation cannot separate an Azeotropic mixture
  • (B) Relative volatility of a binary mixture changes appreciably with the minor change in temperature
  • (C) The relative volatility of a binary mixture at Azeotropic composition is unity
  • (D) Flash distillation is practised on wide spread scale in petroleum refinery

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Q. For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

  • (A) Increases
  • (B) Decreases
  • (C) Remain unaffected
  • (D) Passes through a maximum

A

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Q. __________ diffusion is used for separating the isotopes of methane.

  • (A) Thermal
  • (B) Pressure
  • (C) Concentration
  • (D) Force

A

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Q. For a distillation column operating at minimum reflux, the

  • (A) Concentration of liquid and vapour leaving a plate will be same
  • (B) Reflux ratio will be maximum
  • (C) Number of plates required will be maximum
  • (D) None of these

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