Chemical Reaction Engineering for GATE Paper Questions - Set 31 - ObjectiveBooks
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Chemical Reaction Engineering for GATE Paper Questions - Set 31

Practice Test: Question Set - 31


1. The role of a catalyst in a chemical reaction is to change the
    (A) Equilibrium constant
    (B) Activation energy
    (C) Final products
    (D) Heat of reaction

2. For a gaseous phase reaction, rate of reaction is equal to KCA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
    (A) 8
    (B) 16
    (C) 1/8
    (D) 1/16

3. The reactions of high molecularity are rare, because
    (A) Of very large activation energy of many bodies
    (B) Of low probability of many body collisions
    (C) Many body collisions are not favored energetically
    (D) Of requirement of very large concentration for such reactions

4. The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y  3X+2Y indicates that
    (A) Pressure has no effect
    (B) Backward reaction is favored
    (C) Forward reaction is favored
    (D) None of these

5. Holding time for flow reactors is __________ the space time, for constant fluid density
    (A) Double
    (B) Triple
    (C) Equal to
    (D) None of these

6. Signal normally used to study non-ideal flow by stimulus response technique is __________ input.
    (A) Pulse
    (B) Step
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

7. Design of heterogamous catalytic reactor involves consideration of __________ steps.
    (A) Only chemical
    (B) Only physical
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

8. A high space velocity means that a given
    (A) Reaction can be accomplished with small reactor
    (B) Conversion can be obtained with a high feed rate
    (C) Both (a) and (b)
    (D) None of these

9. Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CAa-b
    (A) Use high pressure and eliminate inerts, when a > b
    (B) Avoid recycle, when a > b
    (C) Use batch reactor or plug flow reactor, when a > b
    (D) Use CSTR with a high conversion, when a > b

10. At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of ‘E/R’?
    (A) 1.6
    (B) 2
    (C) 2.24
    (D) 2.5

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