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Chemical Engineering :: Chemical Reaction Engineering

  1. For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by

  2. A.
    a dirac delta function
    B.
    a step function.
    C.
    a ramp function.
    D.
    none of the above

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  3. Fluid flow in a real packed bed can be approximated as __________ model.

  4. A.
    plug flow
    B.
    dispersion
    C.
    mixed flow
    D.
    tank in series

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  5. For series reaction, the relative yield

  6. A.
    is always greater for plug-flow reactor than for the single CSTR of the same volume.
    B.
    statement in (a) is wrong.
    C.
    decreases with increasing conversion.
    D.
    both (a) and (c) hold good.

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  7. The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt

  8. A.
    at the inlet
    B.
    at the outlet
    C.
    in the reactor
    D.
    averaged over the inlet and outlet

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  9. To maximise the formation of R in the simultaneous reaction
    A + B R , rR = 2CA0.5.CB2
    A + B S , rS = 1.5 CA . CB
    We should have

  10. A.
    low CA, low CB
    B.
    low CA, high CB
    C.
    high CA, low CB
    D.
    high CA, high CB

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  11. A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to

  12. A.
    lose a proton.
    B.
    gain a proton.
    C.
    lose an electron
    D.
    none of these.

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  13. A stirred tank reactor compared to tubular-flow reactor provides

  14. A.
    more uniform operating conditions.
    B.
    permits operation at the optimum temperature for a long reaction time.
    C.
    higher overall selectivity for a first order consecutive reaction.
    D.
    all (a), (b) and (c)

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  15. A chemical reaction, A 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is

  16. A.
    0.33
    B.
    0.5
    C.
    1
    D.
    data insufficient, can't be predicted

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  17. A catalyst inhibitor

  18. A.
    lessens its selectivity.
    B.
    may be useful for suppressing undesirable side reactions.
    C.
    is added in small quantity during the catalyst manufacture itself.
    D.
    all(a), (b) and (c).

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  19. In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction.

  20. A.
    non-catalytic homogeneous
    B.
    non-catalytic heterogeneous
    C.
    catalytic homogenous
    D.
    catalytic heterogeneous

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