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MCQs

Total Questions : 2307 | Page 8 of 231 pages
Question 71. When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
  1.    Packed
  2.    Spray
  3.    Tray
  4.    Bubble
 Discuss Question
Answer: Option D. -> Bubble
Question 72. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
  1.    Operational yield
  2.    Relative yield
  3.    Selectivity
  4.    None of these
 Discuss Question
Answer: Option C. -> Selectivity
Question 73. Promoter is added to the catalyst to improve its
  1.    Porosity
  2.    Sensitivity
  3.    Surface area
  4.    None of these
 Discuss Question
Answer: Option B. -> Sensitivity
Question 74. For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
  1.    1
  2.    0.5
  3.    0.1
  4.    0
 Discuss Question
Answer: Option C. -> 0.1
Question 75. In which of the following reactions, thee-quilibrium will shift to the right, if the total pressure is increased?
  1.    H₂ + Cl₂ ⇋ 2HCl
  2.    N₂ + O₂ ⇋ 2NO
  3.    N₂O₄ ⇋ 2 NO₂
  4.    H₂ + I₂ ⇋ 2HI
 Discuss Question
Answer: Option B. -> N₂ + O₂ ⇋ 2NO
Question 76. An example of autothermal reactor operation is
  1.    Sulphur dioxide oxidation
  2.    Ethylene oxidation
  3.    Benzene oxidation
  4.    Ammonia synthesis
 Discuss Question
Answer: Option B. -> Ethylene oxidation
Question 77. The performance of a cascade of CSTR's can be improved by adding
  1.    A P.F. reactor in series
  2.    A P.F. reactor in parallel
  3.    More CSTR's in series
  4.    More CSTR's in parallel
 Discuss Question
Answer: Option C. -> More CSTR's in series
Question 78. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
  1.    Zero order
  2.    Third order
  3.    Consecutive
  4.    None of these
 Discuss Question
Answer: Option A. -> Zero order
Question 79. Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
  1.    Batch
  2.    Plug-flow
  3.    Mixed
  4.    None of these
 Discuss Question
Answer: Option C. -> Mixed
Question 80. For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is
  1.    1
  2.    >1
  3.    ∞
  4.    ≥1
 Discuss Question
Answer: Option C. -> ∞

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