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Chemical Engineering :: Chemical Reaction Engineering

  1. In an ideal tubular-flow reactor

  2. A.
    there is no mixing in longitudinal direction.
    B.
    mixing takes place in radial direction.
    C.
    there is a uniform velocity across the radius.
    D.
    all (a), (b) and (c).

  3. At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?

  4. A.
    1.6
    B.
    2
    C.
    2.24
    D.
    2.5

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

  6. A.
    Gas film diffusion
    B.
    Ash diffusion
    C.
    Chemical reaction
    D.
    none of these

  7. An autothermal reactor is

  8. A.
    most suitable for a second order reaction.
    B.
    most suitable for a reversible reaction.
    C.
    completely self-supporting in its thermal energy requirements.
    D.
    isothermal in nature.

  9. The rate constant of a first order reaction depends on the

  10. A.
    concentration of the reactant.
    B.
    temperature.
    C.
    concentration of the product.
    D.
    time.

  11. A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

  12. A.
    catalytic
    B.
    autocatalytic
    C.
    photochemical
    D.
    none of these

  13. Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?

  14. A.
    Increasing the concentration of one of the reactants.
    B.
    Increasing the concentration of one or more of the products.
    C.
    Removal of at least one of the products at regular interval.
    D.
    None of these.

  15. Conversion increases with increase in temperature in case of a an __________ reaction.

  16. A.
    autocatalytic
    B.
    irreversible
    C.
    reversible endothermic
    D.
    reversible exothermic

  17. Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as

  18. A.
    DE = DM + DK
    B.
    C.
    DE = DM . DE
    D.
    DE = DN/DE

  19. A photochemical reaction is __________ light.

  20. A.
    initiated by
    B.
    accompanied with emission of
    C.
    catalysed by
    D.
    used to convert heat energy into