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Chemical Engineering :: Chemical Reaction Engineering

  1. Pick out the wrong statement.

  2. A.
    In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time.
    B.
    In a semi-batch reactor, one reactant is charged batchwise, while the other reactant is fed continuously.
    C.
    In a continuous flow reactor, uniform concentration can not be maintained throughout the vessel even in a well agitated system.
    D.
    In a continuous flow reactor, both the reactants and the products flow out continuously.

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  3. In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.

  4. A.
    adiabatic
    B.
    isothermal
    C.
    non-adiabatic
    D.
    none of these.

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  5. 'Unreacted core model' represents the reaction involving

  6. A.
    combustion of coal particles.
    B.
    roasting of sulphide ores.
    C.
    manufacture of carbon disulphide from elements.
    D.
    none of these.

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  7. For a vapour phase catalytic reaction (A + B P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs).

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  9. If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.

  10. A.
    film
    B.
    ash layer
    C.
    pore
    D.
    none of these

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  11. The units of frequency factor in Arhenious equation

  12. A.
    are the same as those of the rate constant.
    B.
    depend on the order of the reaction.
    C.
    depend on temperature, pressure etc. of the reaction.
    D.
    are cycles per unit time.

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  13. Which of the following is not a chemical step in a fluid solid catalytic reaction ?

  14. A.
    Surface chemical reaction
    B.
    Adsorption
    C.
    Desorption
    D.
    None of these

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  15. For a series of reactions having k1 << k2, the reaction system can be approximated as

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  17. At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
    CH4(g) + H2O(g) CO(g) + 3H2(g),
    CO(g) + H2O(g) CO2(g) + H2(g)
    CH4(g) + 2H2O(g) CO2(g) + 4H2(g)
    Then K1, K2 and K3 are related as:

  18. A.
    K3 = K1.K2
    B.
    K3 = (K1.K2)0.5
    C.
    K3(K1+K2)/2
    D.
    K3 = (K1.K2)2

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  19. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.

  20. A.
    catalytic
    B.
    parallel
    C.
    series
    D.
    auto catalytic

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