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Chemical Engineering :: Chemical Reaction Engineering

  1. Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is

  2. A.
    1/2
    B.
    1/3
    C.
    1/4
    D.
    1/5

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  3. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.

  4. A.
    autocatalytic
    B.
    exothermic
    C.
    endothermic
    D.
    autothermal

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  5. For all positive reaction orders for a particular duty,

  6. A.
    mixed reactor is always larger than the plug-flow reactor.
    B.
    ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order.
    C.
    reactor size is independent of the type of flow.
    D.
    density variation during reaction affects design.

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  7. The heat of reaction

  8. A.
    depends on the pressure only.
    B.
    depends on the mechanism of reaction only.
    C.
    depends on both pressure and mechanism of reaction.
    D.
    is independent of the mechanism of reaction.

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  9. Which of the following does not produce a change in the value of rate constant of a reaction ?

  10. A.
    Pressure
    B.
    Temperature
    C.
    Concentration and catalyst
    D.
    None of these.

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  11. With increase in temperature, the equilibrium conversion of a reversible exothermic reaction

  12. A.
    decreases
    B.
    increases
    C.
    remains unaffected
    D.
    decreases linearily with temperature

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  13. In a CSTR __________ varies with time.

  14. A.
    reaction rate
    B.
    concentration
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  15. The following gas phase reactions are carried out isothermally in a CSTR.
    A 2R ; r1 = k1pA ;
    k1 = 20mole/(sec.m3 bar)
    A 3S ; r2 = k2 pA ;
    k2 = 40mole/(sec.m3 .bar)
    What is the maximum possible value of FR(mole/sec.) ?

  16. A.
    1/3
    B.
    1/2
    C.
    2/3
    D.
    2

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  17. As the chemical reaction proceeds, the rate of reaction

  18. A.
    increases.
    B.
    decreases.
    C.
    remains same.
    D.
    may increase or decrease depending on the type of reaction.

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  19. Pick out the wrong statement.

  20. A.
    A catalyst does not alter the final position of equilibrium in a reversible reaction.
    B.
    A catalyst initiates a reaction.
    C.
    A catalyst is specific in reaction.
    D.
    A catalyst remains unchanged in chemical composition at the end the reaction.

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