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Chemical Engineering :: Chemical Reaction Engineering

  1. For the same residence time, which one will give the maximum conversion ?

  2. A.
    Single stirred tank (v = 5 litres).
    B.
    Two stirred tank (each of 2.5 litres) in series.
    C.
    Stirred tank followed by tubular flow reactor (each of 2.5 litres).
    D.
    Single tubular flow reactor (v = 5 litres).

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  3. __________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.

  4. A.
    N2
    B.
    H2
    C.
    CO2
    D.
    He

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  5. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by

  6. A.
    e-t/τ
    B.
    C.
    1 - e-t/τ
    D.

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  7. The rate constant of a reaction depends on the

  8. A.
    initial concentration of reactants.
    B.
    time of reaction.
    C.
    temperature of the system.
    D.
    extent of reaction.

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  9. For the reversible reaction A 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?

  10. A.
    0.253
    B.
    0.338
    C.
    0.152
    D.
    0.637

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  11. For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single

  12. A.
    CSTR of volume V
    B.
    PFR of volume V
    C.
    CSTR of volume V/X
    D.
    PFR of volume V/X

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  13. Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.

  14. A.
    3
    B.
    4
    C.
    6
    D.
    8

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  15. For a __________ order reaction, the units of rate constant and rate of reaction are the same.

  16. A.
    zero
    B.
    first
    C.
    second
    D.
    fractional

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  17. In case of staged packed bed reactors carrying out exothermic reaction, use

  18. A.
    high recycle for pure gas.
    B.
    plug flow for dilute liquid requiring no large preheating of feed.
    C.
    cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature.
    D.
    all (a), (b) and (c).

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  19. Vegetable oils are hydrogenated in a __________ reactor.

  20. A.
    slurry
    B.
    plug flow
    C.
    homogeneous catalytic
    D.
    none of these

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