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MCQs

Total Questions : 3241 | Page 11 of 325 pages
Question 101. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
  1.    Cost
  2.    Availability
  3.    Toxicity
  4.    Selectivity
 Discuss Question
Answer: Option D. -> Selectivity
Question 102. Ponchan-Savarit method analyses the fractional equipment based on
  1.    Enthalpy balance only
  2.    Material balance only
  3.    Both enthalpy and material balances
  4.    The assumption of constant molaloverflow
 Discuss Question
Answer: Option C. -> Both enthalpy and material balances
Question 103. The solvent used in liquid extraction should not have high latent heat of vaporisation, because
  1.    The pressure drop and hence the pumping cost will be very high
  2.    It cannot be recovered by distillation
  3.    Its recovery cost by distillation may be prohibitatively high
  4.    It will decompose while recovering by distillation
 Discuss Question
Answer: Option C. -> Its recovery cost by distillation may be prohibitatively high
Question 104. The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity Dsub>BA (for component B diffusing in A) for a binary mixture of
  1.    Newtonion liquids
  2.    Non-Newtonion liquids
  3.    Ideal gases
  4.    Real gases
 Discuss Question
Answer: Option C. -> Ideal gases
Question 105. For absorbers, high pressure drop results in
  1.    Increased efficiency
  2.    Decreased efficiency
  3.    High operating cost
  4.    Better gas liquid contact
 Discuss Question
Answer: Option C. -> High operating cost
Question 106. Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
  1.    High evaporation losses of water
  2.    High pressure drop of the gas
  3.    Difficulty in its fabrication
  4.    None of these
 Discuss Question
Answer: Option B. -> High pressure drop of the gas
Question 107. Which of the following equipments is not used in liquid-liquid extraction?
  1.    Pachuka tank
  2.    Agitated vessels
  3.    Centrifugal extractors
  4.    Packed towers
 Discuss Question
Answer: Option A. -> Pachuka tank
Question 108. Drying of a solid involves __________ transfer.
  1.    Only heat
  2.    Only mass
  3.    Both heat and mass
  4.    None of these
 Discuss Question
Answer: Option C. -> Both heat and mass
Question 109. With increase in temperature, the solubility of gases in liquids, at fixed pressure
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    Either A or B, depends on the system
 Discuss Question
Answer: Option B. -> Decreases
Question 110. Dryer widely used in a textile industry is __________ dryer.
  1.    Festoon
  2.    Cylinder
  3.    Conveyor
  4.    Tunnel
 Discuss Question
Answer: Option C. -> Conveyor

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