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Chemical Engineering :: Chemical Reaction Engineering

  1. Pick out the wrong statement.

  2. A.

     Exit age description function (E) and internal age distribution function (I) are related as,E = - dI/d0 .#

    B.

     Chmisorption studies are useful in the determination of catalyst surface area and pore size distribution

    C.

     A higher temperature favours the reaction of higher activation energy

    D.

     A catalyst increases the potential energy barrier over which the reactants must pass to form products


  3. The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)

  4. A.

     L√(K/D1)

    B.

     1/(L√(K/D1))

    C.

     1

    D.

     ∞


  5. The performance equations for constant density systems are identical for

  6. A.

     P.F.R. and backmix reactor

    B.

     P.F.R. and batch reactor

    C.

     P.F.R, batch reactor and backmix reactor

    D.

     Batch reactor and backmix reactor


  7. During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the

  8. A.

     Temperature is increased

    B.

     Pressure is reduced

    C.

     Temperature is increased and pressure is reduced

    D.

     Temperature is reduced and pressure is increased


  9. __________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.

  10. A.

     Gas film diffusion

    B.

     Ash diffusion

    C.

     Chemical reaction

    D.

     None of these


  11. Space time in flow reactor is

  12. A.

     Usually equal to the residence time

    B.

     The reciprocal of the space velocity

    C.

     A measure of its capacity

    D.

     Both A and B


  13. Space velocity

  14. A.

     Describes the extensive operating characteristics of a tubular flow reactor

    B.

     Is the maximum feed rate pre unit volume of reactor for a given conversion

    C.

     Is a measure of the ease of the reaction

    D.

     All of the above


  15. The residence time distribution of an ideal CSTR is

  16. A.

     1/τ exp (-t/τ)

    B.

     Τ exp (-t/τ)

    C.

     Exp(-t/τ)

    D.

     1/τ (-t/τ)


  17. To maximise the formation of R in the simultaneous reaction
    A + B → R , rR = 2CA0.5.CB2
    A + B → S , rS = 1.5 CA . CB
    We should have

  18. A.

     Low CA, low CB

    B.

     Low CA, high CB

    C.

     High CA, low CB

    D.

     High CA, high CB


  19. The rate constant of a reaction depends on the

  20. A.

     Initial concentration of reactants

    B.

     Time of reaction

    C.

     Temperature of the system

    D.

     Extent of reaction