Mass Transfer MCQs with answers Page - 24

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Q. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column.

  • (A) 5
  • (B) 9
  • (C) 12
  • (D) 28

A

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Q. With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible.

  • (A) Increases
  • (B) Decreases
  • (C) Remain same
  • (D) Increases linearly

A

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Q. During the constant rate period of drying of a solid,

  • (A) Increased air humidity decreases the rate of drying
  • (B) Increasing the air temperature decreases the drying rate
  • (C) Surface evaporation of unbound moisture occurs
  • (D) None of these

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Q. Large scale drying of wheat is done in a __________ dryer.

  • (A) Fluidised bed
  • (B) Spouted bed
  • (C) Tray
  • (D) Vacuum rotary

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Q. Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

  • (A) Insoluble in the liquid
  • (B) Soluble in the liquid
  • (C) Non-ideal in nature
  • (D) At a fixed temperature

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

  • (A) Decreased liquid viscosity
  • (B) Increased diffusivity
  • (C) Both (A) and (B)
  • (D) Neither (A) nor (B)

A

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Q. As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

  • (A) Increase
  • (B) Decrease
  • (C) Remain unchanged
  • (D) Can either increase or decrease, depends on the system

A

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Q. In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

  • (A) q > 1
  • (B) q < 1
  • (C) q = 1
  • (D) q = 0

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Q. Large scale drying of sugar is done in a __________ dryer.

  • (A) Spouted bed
  • (B) Tray
  • (C) Rotary
  • (D) Truck

A

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Q. Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

  • (A) Lower than
  • (B) Higher than
  • (C) Same as
  • (D) Either same or higher than

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