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Chemical Engineering :: Chemical Reaction Engineering

  1. For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

  2. A.

     Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase

    B.

     Surface reaction between absorbed A and absorbed B

    C.

     Surface reaction between A in the gas phase and absorbed B

    D.

     Desorption of C


  3. In an ideal P.F.R. at steady state conditions

  4. A.

     The composition of reactants remains constant along a flow path

    B.

     The conversion of the reactant varies from point to point along a flow path

    C.

     There is no lateral mixing of fluid

    D.

     There may be diffusion along the flow path


  5. 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).Csub>Aa-b

  6. 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


  7. The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from

  8. A.

     L.0 to 10⁻⁸

    B.

     L.l.to 10²

    C.

     0.1 to 0.9

    D.

     None of these


  9. Helium-mercury method can be used to determine the __________ of the catalyst particle.

  10. A.

     Pore volume

    B.

     Solid density

    C.

     Porosity

    D.

     All of the above


  11. An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.

  12. A.

     Is always equal to

    B.

     Is always greater than

    C.

     Is always less than

    D.

     May be greater or less than


  13. Bulk diffusion in catalyst pore __________ with increase in pressure.

  14. A.

     Increases

    B.

     Decreases

    C.

     Remains unchanged

    D.

     Increases exponentially


  15. Chemical kinetics can predict the __________ of a chemical reaction.

  16. A.

     Rate

    B.

     Feasibility

    C.

     Both A & B

    D.

     Neither A nor B


  17. The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

  18. A.

     Greater than

    B.

     Equal to

    C.

     Smaller than

    D.

     Unpredictable from the data


  19. B.E.T. method can be used to determine the __________ of a porous catalyst.

  20. A.

     Solid density

    B.

     Pore volume

    C.

     Surface area

    D.

     All of the above