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Chemical Engineering :: Chemical Reaction Engineering

  1. The importance of diffusion in a catalyst are increased by

  2. A.

     Large catalyst particle size

    B.

     An active surface of the catalyst

    C.

     Small pore diameter

    D.

     All of the above


  3. In a semi-batch reactor

  4. A.

     Velocity of reaction can be controlled

    B.

     Maximum conversion can be controlled

    C.

     Both the reactants flow counter-currently

    D.

     Residence time is constant


  5. In autocatalytic reactions,

  6. A.

     One of the reactants acts as a catalyst

    B.

     One of the products acts as a catalyst

    C.

     Catalysts have very high selectivity

    D.

     No catalyst is used


  7. In case of a P.F.R., there

  8. A.

     May be lateral mixing of fluid

    B.

     Should not be any mixing along the flow path

    C.

     Both A and B

    D.

     Neither A nor B


  9. Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.

  10. A.

     Dynamic steady

    B.

     Static steady

    C.

     Dynamic unsteady

    D.

     None of these


  11. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?

  12. A.

     Pore diffusion

    B.

     Film diffusion

    C.

     Ash layer diffusion

    D.

     Chemical reaction


  13. A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

  14. A.

     Equal in size

    B.

     Of different sizes

    C.

     Of such size that the ratio of their volumes is < 5

    D.

     None of these


  15. Pick out the correct statement.

  16. A.

     A catalyst speeds up the forward reaction but slows shown the reverse reaction

    B.

     Addition of catalyst changes the equilibrium constant

    C.

     Pressure changes do not change the equilibrium concentrations

    D.

     The composition of equilibrium is changed by catalyst


  17. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of

  18. A.

     Ideal plug flow

    B.

     Bypass

    C.

     Dead zone

    D.

     Chanelling


  19. The increase in the rate of reaction with temperature is due to

  20. A.

     Increase in the number of effective collisions

    B.

     Decrease in activation energy

    C.

     Increase in the average kinetic energy of the reacting molecules

    D.

     None of these