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Chemical Engineering :: Chemical Reaction Engineering

  1. 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

  2. A.
    equal in size.
    B.
    of different sizes.
    C.
    of such size that the ratio of their volumes is < 5.
    D.
    none of these.

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  3. A second order liquid phase reaction, A B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is

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  5. Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.

  6. A.
    first
    B.
    zero
    C.
    second
    D.
    third

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  7. The irreversible reaction, X Y, is the special case of the reversible reaction, X Y, in which the

  8. A.
    equilibrium constant is infinite.
    B.
    fractional conversion of 'A' at equilibrium is unity.
    C.
    concentration of 'A' at equilibrium is zero.
    D.
    all (a), (b) and (c).

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  9. The equilibrium constant K of a chemical reaction depends on

  10. A.
    temperature only.
    B.
    pressure only.
    C.
    temperature and pressure.
    D.
    ratio of reactants.

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  11. The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

  12. A.
    increased temperature reduces the activation energy.
    B.
    fraction of molecules having threshold energy increases.
    C.
    collision frequency increases.
    D.
    value of threshold energy decreases.

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  13. Which of the following is not a unit of reaction rate ?

  14. A.
    Moles for med/(surface of catalyst) (time)
    B.
    Moles formed/volume of reactor) (time)
    C.
    Mole formed/volume of catalyst) (time)
    D.
    None of these

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  15. Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

  16. A.
    Langmuir's assumption applies to every adsorbed layer.
    B.
    There is no dynamic equilibrium between successive layer.
    C.
    The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process.
    D.
    none of these.

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  17. The sequence in which three CSTR's of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is

  18. A.
    15, 10, 5
    B.
    5, 10, 15
    C.
    10, 5, 15
    D.
    10, 15, 5

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