Chemical Reaction Engineering Interview Questions - Set 27 - ObjectiveBooks

Chemical Reaction Engineering Interview Questions - Set 27

Practice Test: Question Set - 27

1. The excess energy of the reactants required to dissociate into products is known as the __________ energy.
    (A) Thermal
    (B) Activation
    (C) Threshold
    (D) Binding

2. In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
    (A) 100
    (B) 1000
    (C) 10000
    (D) 100000

3. The decomposition of A into B is represented by the exothermic reaction, A  2B. To achieve maximum decomposition, it is desirable to carry out the reaction.
    (A) At high P and high T
    (B) At low P and high T
    (C) At low P and low T
    (D) At high P and low T

4. Which of the following is a controlling factor in very fast heterogeneous reaction?
    (A) Heat and mass transfer effects
    (B) Pressure
    (C) Temperature
    (D) Composition of reactant

5. An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is:
    (A) Maximum at the inlet of the reactor
    (B) Maximum at the exit of the reactor
    (C) Maximum at the center of the reactor
    (D) Constant throughout the reactor

6. For a zero order chemical reaction, the
    (A) Half life period is directly proportion to the initial concentration of the reactants
    (B) Plot of products concentration with time is a straight line through the origin
    (C) Products concentration increases linearly with time
    (D) All (a), (b) and (c)

7. Pick out the wrong statement.
    (A) A particular chemical reaction is more temperature sensitive at low temperatures
    (B) A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature
    (C) The intercept of the Arrhenius plot is called the 'activation energy'
    (D) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

8. An imbalanced chemical reaction equation is against the law of
    (A) Multiple proportion
    (B) Conservation of mass
    (C) Constant proportion
    (D) None of these

9. For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cxn, then what is the value of ‘n’?
    (A) 1/4
    (B) 2
    (C) 4
    (D) 16

10. __________ is the response curve for a step input signal from a reactor.
    (A) S-curve
    (B) C-curve
    (C) I-curve
    (D) None of these

11. Backmixing is most predominant in
    (A) A well stirred batch reactor
    (B) A plug-flow reactor
    (C) A single CSTR
    (D) CSTR's connected in series

12. Enzymes are destroyed, when the
    (A) Temperature is very high
    (B) Reactant's concentration is very high
    (C) Reactant's concentration is very low
    (D) Reaction rate is independent of the reactant's concentration

13. The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
    (A) Reaction is elementary with a molecularity of 2
    (B) Molecularity of the reaction is 2, but the reaction may not be elementary
    (C) Reaction may be elementary with molecularity of 2
    (D) Reaction is elementary but the molecularity may not be 2

14. 'N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.
    (A) First
    (B) Second
    (C) Third
    (D) Any

15. Exothermic reactions are best carried out in
    (A) A CSTR
    (B) CSTR in series
    (C) A plug flow reactor followed by CSTR
    (D) CSTR followed by a plug flow reactor

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