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Chemical Engineering :: Chemical Reaction Engineering

  1. Which of the following is a controlling factor in very fast heterogeneous reaction ?

  2. A.
    Heat and mass transfer effects
    B.
    Pressure
    C.
    Temperature
    D.
    Composition of reactant

  3. Enzymes are destroyed, when the

  4. A.
    temperature is very high,
    B.
    reactant's concentration is very high.
    C.
    reactant's concentration is very low.
    D.
    reaction rate is independent of the reactant's concentration.

  5. For an autocatalytic reactor, the suitable reactor set up is

  6. A.
    P.F. reactors in series.
    B.
    CSTR in series.
    C.
    CSTR followed by P.F. reactor.
    D.
    P.F. reactor followed by CSTR.

  7. Ionic reactions occur in

  8. A.
    solid state only
    B.
    liquid state only
    C.
    solutions
    D.
    any state

  9. Sometimes, batch process is preferred over continuous process, when the product

  10. A.
    quality & yield can not be achieved in continuous processes, because of long residence time.
    B.
    sales demand is fluctuating.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

  11. In a chemical reaction , it is observed that the
    (i) rate of formation of 'P' is doubled on doubling the concentration of 'X'.
    (ii) rate of formation of 'P' is quadrupled on doubling the concentration of 'Y'.
    (iii) doubling the concentration of 'Z' does not affect the rate of formation of 'P'.
    What is the order of the above chemical reaction?

  12. A.
    Zeroth order
    B.
    First order
    C.
    Second order
    D.
    Third order

  13. The half life period of a first order reaction is given by (where, K = rate constant. )

  14. A.
    1.5 K
    B.
    2.5 K
    C.
    0.693/K
    D.
    6.93 K

  15. Half life period of a chemical reaction is

  16. A.
    the time required to reduce the concentration of the reacting substance to half its initial value.
    B.
    half of the space time of a reaction.
    C.
    half of the residence time of a reaction.
    D.
    none of these

  17. In the gaseous phase ammonia formation reaction (N2 + 3H2 2NH3), the value of the equilibrium constant depends on the

  18. A.
    total pressure of the system.
    B.
    volume of the reactor.
    C.
    temperature.
    D.
    initial concentration of N2 and H2.

  19. Transition state theory relates the above quantities as

  20. A.
    k ∝ e-E/RT
    B.
    kT.eE/RT
    C.
    kT
    D.
    kT1.5