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MCQs

Total Questions : 3241 | Page 30 of 325 pages
Question 291. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
  1.    0
  2.    1
  3.    < 1
  4.    > 1
 Discuss Question
Answer: Option B. -> 1
Question 292. With increase in pressure, the relative volatility for a binary system
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    Either A or B, depends on the system
 Discuss Question
Answer: Option B. -> Decreases
Question 293. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
  1.    Increase both 'G' and 'S'
  2.    Decrease both 'G' and 'S'
  3.    Increase 'S' and decrease 'G'
  4.    Increase 'G' and decrease 'S'
 Discuss Question
Answer: Option C. -> Increase 'S' and decrease 'G'
Question 294. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
  1.    Furfural
  2.    Benzol
  3.    Butyl acetate
  4.    Hexane
 Discuss Question
Answer: Option C. -> Butyl acetate
Question 295. The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
  1.    1
  2.    0.24
  3.    3.97
  4.    600
 Discuss Question
Answer: Option A. -> 1
Question 296. Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
  1.    Less
  2.    More
  3.    Equal
  4.    Either A or B; depends on the packing height
 Discuss Question
Answer: Option B. -> More
Question 297. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
  1.    Calculated
  2.    Unknown
  3.    Known
  4.    Not required
 Discuss Question
Answer: Option C. -> Known
Question 298. At minimum reflux ratio for a given separation
  1.    Number of plates is zero
  2.    Number of plates is infinity
  3.    Minimum number of the theoretical plates is required
  4.    Separation is most efficient
 Discuss Question
Answer: Option B. -> Number of plates is infinity
Question 299. An azeotropic mixture is a __________ mixture.
  1.    Binary
  2.    Ternary
  3.    Constant boiling point
  4.    None of these
 Discuss Question
Answer: Option C. -> Constant boiling point
Question 300. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.
  1.    0.25
  2.    2.5
  3.    1.25
  4.    0.0025
 Discuss Question
Answer: Option A. -> 0.25

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