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MCQs

Total Questions : 3241 | Page 7 of 325 pages
Question 61. The value of L/mG ratio for economical absorption operation ranges from
  1.    0.5 to 0.8
  2.    0.8 to 1.2
  3.    1.25 to 2.0
  4.    2.5 to 3.5
 Discuss Question
Answer: Option C. -> 1.25 to 2.0
Question 62. Swenson-Walker crystalliser is a __________ unit
  1.    Continuous
  2.    Batch
  3.    Semi-batch
  4.    Cooling (adiabatic)-cum-evaporation
 Discuss Question
Answer: Option A. -> Continuous
Question 63. Steam distillation is used to
  1.    Reduce the number of plates
  2.    Avoid thermal decomposition of a component
  3.    Increase the efficiency of separation
  4.    Increase the total pressure of distillation
 Discuss Question
Answer: Option B. -> Avoid thermal decomposition of a component
Question 64. For water-ethanol system, the minimum reflux ratio
  1.    Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
  2.    Is computed from the intercept of the operating line
  3.    Cannot be computed
  4.    Is the optimum reflux ratio
 Discuss Question
Answer: Option A. -> Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Question 65. At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
  1.    0
  2.    1
  3.    ∞
  4.    < 1
 Discuss Question
Answer: Option C. -> ∞
Question 66. Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for
  1.    Constant molal overflow
  2.    Total reflux
  3.    Constant relative volatility
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 67. Steam distillation is used to separate
  1.    Azeotropes
  2.    High boiling substances from nonvolatile impurities
  3.    Heat sensitive materials
  4.    Mixtures of low relative volatility
 Discuss Question
Answer: Option B. -> High boiling substances from nonvolatile impurities
Question 68. According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to
  1.    F
  2.    F/2
  3.    2f
  4.    1/f
 Discuss Question
Answer: Option B. -> F/2
Question 69. Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled
  1.    And humidified
  2.    And dehumidified with increase in wet bulb temperature
  3.    At the same relative humidity
  4.    And dehumidified with decrease in wet bulb temperature
 Discuss Question
Answer: Option D. -> And dehumidified with decrease in wet bulb temperature
Question 70. The percentage humidity is less than the relative humidity only at __________ percent humidity.
  1.    Zero
  2.    Hundred
  3.    Both zero and hundred
  4.    None of these
 Discuss Question
Answer: Option C. -> Both zero and hundred

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