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MCQs

Total Questions : 3241 | Page 251 of 325 pages
Question 2501. To get high tray efficiency
  1.    Time of contact between the two phases should be less
  2.    Liquid entrainment should be severe
  3.    Interfacial surface between liquid and gas phase should be large
  4.    Gas velocity should be very low
 Discuss Question
Answer: Option C. -> Interfacial surface between liquid and gas phase should be large
Question 2502. Perforated plate towers are unique for solvent extraction because, they provide
  1.    Repeated coalescence & redispersion of the drop phase
  2.    Better contact of the phase
  3.    None of these
  4.    Higher contact area
 Discuss Question
Answer: Option A. -> Repeated coalescence & redispersion of the drop phase
Question 2503. Paper industry employs __________ driers.
  1.    Fluidised bed
  2.    Cylinder
  3.    Spray
  4.    Rotary
 Discuss Question
Answer: Option B. -> Cylinder
Question 2504. With increase in temperature, the mutual solubility of two liquids
  1.    Decreases exponentially
  2.    Decreases
  3.    Increases
  4.    Remains unchanged
 Discuss Question
Answer: Option C. -> Increases
Question 2505. For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because
  1.    Lewis number is close to unity
  2.    They are always equal under all circumstances
  3.    Water has a high latent heat of evaporation
  4.    Solubility of the components of air in water is very small
 Discuss Question
Answer: Option C. -> Water has a high latent heat of evaporation
Question 2506. The-relative volatility for separation of a non-ideal binary mixture by distillation should be
  1.    < 1
  2.    > 1
  3.    1
 Discuss Question
Answer: Option B. -> > 1
Question 2507. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
  1.    Baffle
  2.    Plate
  3.    Packed
  4.    None of these
 Discuss Question
Answer: Option A. -> Baffle
Question 2508. In which of the following unit operations, the selectivity is an important parameter?
  1.    Solvent extraction
  2.    Absorption
  3.    Distillation
  4.    None of these
 Discuss Question
Answer: Option A. -> Solvent extraction
Question 2509. Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )
  1.    (1 - Ro) = Ro/Ri
  2.    (1 - Ri) = Ro/Ri
  3.    (1 + Ro) = Ro/Ri
  4.    (1 + Ri) = Ro/Ri
 Discuss Question
Answer: Option C. -> (1 + Ro) = Ro/Ri
Question 2510. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?
  1.    The mixture exhibits an azeotrope at 101.3 kPa
  2.    The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
  3.    The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10
  4.    The mixture contain optical isomers
 Discuss Question
Answer: Option A. -> The mixture exhibits an azeotrope at 101.3 kPa

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