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Chemical Engineering :: Chemical Reaction Engineering

  1. A batch reactor is characterised by

  2. A.

     Constant residence time

    B.

     Variation in extent of reaction and properties of the reaction mixture with time

    C.

     Variation in reactor volume

    D.

     Very low conversion


  3. In a continuous flow stirred tank reactor, the composition of the exit stream

  4. A.

     Is same as that in the reactor

    B.

     Is different than that in the reactor

    C.

     Depends upon the flow rate of inlet stream

    D.

     None of these


  5. Rate of a chemical reaction is not influenced by the

  6. A.

     Catalyst

    B.

     Temperature

    C.

     Reactants concentration

    D.

     Number of molecules of reactants taking part in a reaction


  7. A catalyst inhibitor

  8. A.

     Lessens its selectivity

    B.

     May be useful for suppressing undesirable side reactions

    C.

     Is added in small quantity during the catalyst manufacture itself

    D.

     All of the above


  9. Exothermic reactions are best carried out in

  10. A.

     A CSTR

    B.

     CSTR in series

    C.

     A plug flow reactor followed by CSTR

    D.

     CSTR followed by a plug flow reactor


  11. A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.

  12. A.

     Less than

    B.

     Equal to

    C.

     More than

    D.

     Equal to or more than


  13. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.

  14. A.

     Stirred tank

    B.

     Tubular flow

    C.

     Batch

    D.

     Fixed bed


  15. Slurry reactors are characterised by the

  16. A.

     Lack of intraparticle diffusion resistance

    B.

     Presence of two mobile phases

    C.

     Both A and B

    D.

     Neither A nor B


  17. Sulphuric acid is used as a catalyst in the

  18. A.

     Hydrogenation of oils

    B.

     Gas phase oxidation of SO₂ in chamber process

    C.

     Alkylation of hydrocarbons

    D.

     None of these


  19. The half life period of a first order reaction is

  20. A.

     Always the same irrespective of the reaction

    B.

     Dependent on initial concentration of the reactants

    C.

     Proportional to the initial concentration of reactants

    D.

     Half the specific rate constant