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MCQs

Total Questions : 3241 | Page 255 of 325 pages
Question 2541. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
  1.    Agitated vessel
  2.    Packed tower
  3.    Sieve tray column
  4.    Bubble cap column
 Discuss Question
Answer: Option A. -> Agitated vessel
Question 2542. Radioactive nuclear waste is treated in
  1.    Mixer-settler extractor
  2.    Rotating-disc contactor
  3.    Bollman extractor
  4.    Pulsed column extractor
 Discuss Question
Answer: Option D. -> Pulsed column extractor
Question 2543. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
  1.    1
  2.    > 1
  3.    < 1
 Discuss Question
Answer: Option A. -> 1
Question 2544. Danckwerts developed the __________ theory.
  1.    None of these
  2.    Surface renewal
  3.    Penetration
  4.    Film
 Discuss Question
Answer: Option B. -> Surface renewal
Question 2545. With increase in pressure, the relative volatility for a binary system
  1.    Decreases
  2.    Either A or B, depends on the system
  3.    Remains same
  4.    Increases
 Discuss Question
Answer: Option A. -> Decreases
Question 2546. Unit operation involved in the prilling of urea is
  1.    Drying
  2.    Crystallisation
  3.    Both B and C
  4.    Evaporation
 Discuss Question
Answer: Option C. -> Both B and C
Question 2547. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
  1.    Hexane
  2.    Benzol
  3.    Furfural
  4.    Butyl acetate
 Discuss Question
Answer: Option D. -> Butyl acetate
Question 2548. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
  1.    Increase 'G' and decrease 'S'
  2.    Increase both 'G' and 'S'
  3.    Decrease both 'G' and 'S'
  4.    Increase 'S' and decrease 'G'
 Discuss Question
Answer: Option D. -> Increase 'S' and decrease 'G'
Question 2549. The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
  1.    600
  2.    3.97
  3.    0.24
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 2550. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
  1.    Not required
  2.    Calculated
  3.    Known
  4.    Unknown
 Discuss Question
Answer: Option C. -> Known

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