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Chemical Engineering :: Chemical Reaction Engineering

  1. The reason why a catalyst increases the rate of reaction is that, it

  2. A.

     Decreases the energy barrier for reaction

    B.

     Increases the activation energy

    C.

     Decreases the molecular collision diameter

    D.

     None of these


  3. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

  4. A.

     Decreases

    B.

     Increases

    C.

     Is at the highest allowable temperature throughout

    D.

     First increases and then decreases


  5. __________ catalytic reaction is involved in the thermal cracking of gas oil.

  6. A.

     Homogeneous

    B.

     Homogeneous non

    C.

     Heterogeneous

    D.

     Heterogeneous non


  7. A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.

  8. A.

     1

    B.

     3

    C.

     1/3

    D.

     32


  9. In the reversible reaction of the type, A + B ⇋ AB, in general

  10. A.

     Both forward and backward reactions will be exothermic

    B.

     Neither of the reactions will be en-dothermic

    C.

     The combination reaction will be exothermic, while the dissociation reaction will be endothermic

    D.

     The combination reaction will be endothermic, while the dissociation reaction will be exothermic


  11. Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)

  12. A.

     Reactor dispersion number (D/vL)

    B.

     Reduced time (vt/V)

    C.

     Thiele modulus (L√(k/D1)

    D.

     None of these


  13. Holding time for flow reactors is __________ the space time, for constant fluid density

  14. A.

     Double

    B.

     Triple

    C.

     Equal to

    D.

     None of these


  15. Given,
    3H₂ + CO = CH₄ + H₂O, KP = 101.84 and,
    4H₂ + CO₂ = CH₄ + 2H₂O, KP = 101.17
    the KP for the reaction CO + H₂O = CO₂ + H₂ is

  16. A.

     103.01

    B.

     10-0.67

    C.

     10-3.01

    D.

     L00.67


  17. Rate of a chemical reaction is not affected by the

  18. A.

     Catalyst

    B.

     Temperature

    C.

     Reactant's concentration

    D.

     Number of molecules of reactants taking part in the reaction


  19. Semibatch reactor is preferred, when a/an

  20. A.

     A highly exothermic reaction is to be controlled

    B.

     Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

    C.

     A gas is to be reacted with liquid (e.g. hydrogenation of fat)

    D.

     All of the above