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MCQs

Total Questions : 2307 | Page 24 of 231 pages
Question 231. Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
  1.    Tan hT/T
  2.    Tan T/T
  3.    Tan hT/tan T
  4.    None of these
 Discuss Question
Answer: Option A. -> Tan hT/T
Question 232. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
  1.    Autocatalytic
  2.    Exothermic
  3.    Endothermic
  4.    Autothermal
 Discuss Question
Answer: Option A. -> Autocatalytic
Question 233. With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.
  1.    Constant
  2.    Conversion
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Conversion
Question 234. Catalyst carriers
  1.    Have very high selectivity
  2.    Increase the activity of a catalyst
  3.    Provide large surface area with a small amount of active material
  4.    Inhibit catalyst poisoning
 Discuss Question
Answer: Option C. -> Provide large surface area with a small amount of active material
Question 235. A high space velocity means that a given
  1.    Reaction can be accomplished with small reactor
  2.    Conversion can be obtained with a high feed rate
  3.    Both A and B
  4.    None of these
 Discuss Question
Answer: Option C. -> Both A and B
Question 236. The use of space time is preferred over the mean residence time in the design of a/an
  1.    Batch reactor
  2.    Ideal tubular-flow reactor
  3.    Slurry reactor
  4.    CSTR
 Discuss Question
Answer: Option B. -> Ideal tubular-flow reactor
Question 237. In Langmuir treatment of adsorption,
  1.    Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
  2.    Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
  3.    All the adsorption does not take place by the same mechanism
  4.    Extent of adsorption is more than one complete monomolecular layer on the surface
 Discuss Question
Answer: Option B. -> Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
Question 238. If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
  1.    (CA)n
  2.    (1/2)n.CA
  3.    (CA)1/n
  4.    (CA)1/2n
 Discuss Question
Answer: Option B. -> (1/2)n.CA
Question 239. Pick out the correct statement.
  1.    A catalyst does not change AH of the reaction
  2.    A catalyst changes the equilibrium point
  3.    Law of mass action was suggested by Le-Chatelier
  4.    The difference between the energy of reactants and that of the products is the activation energy
 Discuss Question
Answer: Option A. -> A catalyst does not change AH of the reaction
Question 240. Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
  1.    Higher
  2.    Much higher
  3.    Lower
  4.    Much lower
 Discuss Question
Answer: Option D. -> Much lower

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