Mass Transfer MCQs with answers Page - 10

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A

Admin • 833.24K Points
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Q. Pick out the correct statement.

  • (A) Diffusivity decreases with increase in temperature
  • (B) Diffusivity increases with increase in molecular weight
  • (C) Diffusivity increases with the size of the individual molecule
  • (D) None of these

A

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Q. Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

  • (A) Humidification only
  • (B) Heating only
  • (C) Both heating and humidification
  • (D) Evaporative cooling

A

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Q. An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

  • (A) 0.048
  • (B) 0.079
  • (C) 0.122
  • (D) 0.152

A

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Q. In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

  • (A) Lower than
  • (B) Higher than
  • (C) Equal to
  • (D) Either A or B, depends on the mixture composition

A

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Q. Percentage saturation is __________ the relative saturation.

  • (A) Always greater than
  • (B) Always smaller than
  • (C) Not related to
  • (D) None of these

A

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Q. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

  • (A) Increases with increase in
  • (B) Is one at unity value of
  • (C) Both A and B
  • (D) Neither A nor B

A

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Q. Operating velocity in a packed tower is usually __________ the flooding velocity.

  • (A) Half
  • (B) Twice
  • (C) Equal to
  • (D) More than

A

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Q. Humid volume, at a given temperature is a/an __________ function of humidity.

  • (A) Inverse
  • (B) Exponential
  • (C) Linear
  • (D) Logarithmic

A

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Q. A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

  • (A) 21.7
  • (B) 20
  • (C) 27.3
  • (D) 18.7

A

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Q. For a binary mixture with low relative volatility,

  • (A) Use steam distillation
  • (B) Use molecular distillation
  • (C) Use high pressure distillation
  • (D) An azeotrope may be formed during distillation

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