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Chemical Engineering :: Chemical Reaction Engineering

  1. The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.

  2. A.
    0.5
    B.
    1
    C.
    2
    D.
    3

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  3. The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

  4. A.
    greater than
    B.
    equal to
    C.
    smaller than
    D.
    unpredictable from the data

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  5. A space time of 3 hours for a flow reactor means that

  6. A.
    the time required to process one reactor volume of feed (measured at specified conditions) is 3 hours.
    B.
    three reactor volumes of feed can be processed every hour.
    C.
    it takes three hours to dump the entire volume of the reactor with feed.
    D.
    conversion is cent per cent after three hours.

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  7. The experimentally determined overall order of the reaction, A + B C + D, is two. Then the

  8. A.
    reaction is elementary with a molecularity of 2.
    B.
    molecularity of the reaction is 2, but the reaction may not be elementary.
    C.
    reaction may be elementary with molecularity of 2.
    D.
    reaction is elementary but the molecularity may not be 2.

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  9. In a continuous flow stirred tank reactor, the composition of the exit stream

  10. A.
    is same as that in the reactor.
    B.
    is different than that in the reactor.
    C.
    depends upon the flow rate of inlet stream.
    D.
    none of these.

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  11. Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.

  12. A.
    decrease
    B.
    increase
    C.
    no change
    D.
    either (a) or (b), depends on the type of reaction

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  13. The energy balance equation over a tubular reactor under transient conditions is

  14. A.
    an ordinary non-linear differential equation.
    B.
    an algebric differential equation.
    C.
    a linear partial differential equation.
    D.
    a non-linear partial differential equation.

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  15. Which of the following factors control the deactivation of a porous catalyst pellet ?

  16. A.
    Decay reactions.
    B.
    Pore diffusion.
    C.
    Form of surface attack by poison.
    D.
    All (a), (b) and (c).

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  17. For the reaction, A + B 2B + C,

  18. A.
    rA = rB
    B.
    rA = -rB
    C.
    rA = 2rB
    D.
    rA = rB/2

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  19. Transition state theory gives the rate constant as

  20. A.
    K α e-E/RT
    B.
    K α eE/RT
    C.
    K α T . e-E/RT
    D.
    K α T . e-E/RT

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