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Chemical Engineering :: Chemical Reaction Engineering

  1. For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is

  2. A.
    1
    B.
    >1
    C.
    D.
    ≥1

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  3. Helium-mercury method is used for the measurement of the __________ of the catalyst.

  4. A.
    surface area
    B.
    porosity
    C.
    pore volume
    D.
    both (b) & (c).

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  5. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?

  6. A.
    zero
    B.
    first
    C.
    second
    D.
    third

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  7. Pick out the wrong statement.

  8. A.
    Visible radiation provides the necessary activation energy in photochemical reactions.
    B.
    The order and molecularity of a complex reaction may not be the same.
    C.
    For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k).
    D.
    Molecularity of the reaction is always a whole number greater than zero.

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  9. The rate at which a chemical substance reacts is proportional to its

  10. A.
    active mass
    B.
    equivalent weight
    C.
    molecular weight
    D.
    none of these

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  11. A plug-flow reactor is characterised by

  12. A.
    high capacity.
    B.
    presence of axial mixing.
    C.
    presence of lateral mixing.
    D.
    constant composition and temperature of reaction mixture.

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  13. Three plug flow reactors (PFR's) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure.

    If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr.

  14. A.
    100
    B.
    150
    C.
    200
    D.
    225

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  15. For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

  16. A.
    τ and θ are always equal.
    B.
    τ = θ , when the fluid density changes in the reactor.
    C.
    τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant.
    D.
    τ = θ , for a non-isothermal reactor.

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  17. Rate of an autocatalytic chemical reaction is a function of

  18. A.
    temperature only.
    B.
    pressure only.
    C.
    composition only.
    D.
    all (a), (b) and (c).

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  19. Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?

  20. A.
    Langmuir adsorption isotherm
    B.
    Adsorption isobar
    C.
    Freundlich adsorption isotherm
    D.
    None of these

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