Home / Chemical Engineering / Chemical Reaction Engineering :: Section-11

Chemical Engineering :: Chemical Reaction Engineering

  1. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.

  2. A.

     Catalytic

    B.

     Parallel

    C.

     Series

    D.

     Auto catalytic


  3. In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the

  4. A.

     Total pressure of the system

    B.

     Volume of the reactor

    C.

     Temperature

    D.

     Initial concentration of N₂ and H₂


  5. The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the

  6. A.

     Space time for each parallel line is same

    B.

     Space time for parallel lines is different

    C.

     Larger reactors have more space time compared to smaller ones

    D.

     None of these


  7. 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)

  8. A.

     Tan hT/T

    B.

     Tan T/T

    C.

     Tan hT/tan T

    D.

     None of these


  9. Photochemical reaction rate does not depend significantly on temperature, because

  10. A.

     It is a reversible reaction

    B.

     It is an exothermic reaction

    C.

     The energy of reacting molecules exceeds the activation energy by absorption of light

    D.

     None of these


  11. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.

  12. A.

     Autocatalytic

    B.

     Exothermic

    C.

     Endothermic

    D.

     Autothermal


  13. With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.

  14. A.

     Constant

    B.

     Conversion

    C.

     Both A & B

    D.

     Neither A nor B


  15. Catalyst carriers

  16. A.

     Have very high selectivity

    B.

     Increase the activity of a catalyst

    C.

     Provide large surface area with a small amount of active material

    D.

     Inhibit catalyst poisoning


  17. The use of space time is preferred over the mean residence time in the design of a/an

  18. A.

     Batch reactor

    B.

     Ideal tubular-flow reactor

    C.

     Slurry reactor

    D.

     CSTR


  19. A high space velocity means that a given

  20. 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