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MCQs

Total Questions : 3241 | Page 9 of 325 pages
Question 81. Co-current absorbers are usually used when the gas to be dissolved in the liquid is
  1.    Sparingly soluble
  2.    Highly soluble
  3.    A pure substance
  4.    A mixture
 Discuss Question
Answer: Option C. -> A pure substance
Question 82. The overall mass transfer co-efficient for the absorption of SO₂ in air with dilute NaOH solution can be increased substantially by
  1.    Increasing the gas film co-efficient
  2.    Increasing the liquid film co-efficient
  3.    Increasing the total pressure
  4.    Decreasing the total pressure
 Discuss Question
Answer: Option A. -> Increasing the gas film co-efficient
Question 83. The diffusion co-efficient in m² /s. of acetic acid in benzene (liquid in liquid) is
  1.    2.09 x 10-4
  2.    2.09 x 10-5
  3.    2.09 x 10-9
  4.    2.09 x 10-12
 Discuss Question
Answer: Option A. -> 2.09 x 10-4
Question 84. Experimental determination of __________ is done by wetted wall column method.
  1.    Diffusion co-efficient
  2.    Mass transfer co-efficient
  3.    NTU
  4.    None of these
 Discuss Question
Answer: Option B. -> Mass transfer co-efficient
Question 85. The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.
  1.    Reducing the total pressure
  2.    Increasing the total pressure
  3.    Reducing the temperature
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 86. Powdery materials can be guarded against caking tendency on storage by
  1.    Providing irregular grain size
  2.    Providing minimum percentage of voids
  3.    Having maximum possible points of contact
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 87. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.
  1.    Spray
  2.    Packed
  3.    Bubble cap plate
  4.    Wetted wall
 Discuss Question
Answer: Option D. -> Wetted wall
Question 88. The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is
  1.    More
  2.    Less
  3.    Same
  4.    Either more or less; depends on the system
 Discuss Question
Answer: Option C. -> Same
Question 89. When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.
  1.    Mixture of two gases
  2.    Pure gas
  3.    Ideal gas
  4.    Sparingly soluble gas
 Discuss Question
Answer: Option B. -> Pure gas
Question 90. Coffee is prepared from coffee beans by leaching with
  1.    Cold water
  2.    Hot water
  3.    Dilute hot caustic solution
  4.    Naphtha
 Discuss Question
Answer: Option B. -> Hot water

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