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Chemical Engineering :: Chemical Reaction Engineering

  1. The rate constant of a reaction is a function of the

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

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  3. Mean residence time is equal to the space time, when

  4. A.
    the feed rate is measured at temperature and pressure in the reactor.
    B.
    the temperature, pressure and the density of reaction mixture remains constant throughout the reactor.
    C.
    there is no change in number of moles in gaseous reaction.
    D.
    all (a), (b) and (c).

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  5. If 'n' is the order of reaction, then unit of rate constant is

  6. A.
    1/(time)(concentration)n - 1
    B.
    (time)-1 (concentration)n - 1
    C.
    (time)n - 1 (concentration)
    D.
    none of these

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  7. Batch process is preferred over continuous process, when the

  8. A.
    product yields and quality can not be achieved in continuous process, because of long residence time.
    B.
    sales demand of product is not steady.
    C.
    same equipment can not be used for several processes of the same nature.
    D.
    all (a), (b) & (c)

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  9. With the same reaction time, initial concentration and feed rate, the reaction 2A B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be

  10. A.
    higher in P.F. reactor
    B.
    higher in CSTR
    C.
    same in both the reactors
    D.
    data insufficient; can't be predicted

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  11. For any reaction, we may write conversion as a function of

  12. A.
    time
    B.
    temperature
    C.
    concentration
    D.
    all (a), (b) & (c)

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  13. The use of space time is preferred over the mean residence time in the design of a/an

  14. A.
    batch reactor
    B.
    ideal tubular-flow reactor
    C.
    slurry reactor
    D.
    CSTR

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  15. Autocatalytic reactions are best carried out in a

  16. A.
    CSTR
    B.
    CSTR in series
    C.
    plug flow reactor
    D.
    recycle reactor

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  17. The gas phase reaction 2A B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is

  18. A.
    2/3
    B.
    5/8
    C.
    1/3
    D.
    3/8

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  19. A batch reactor suffers from following disadvantage.

  20. A.
    Poor product quality control.
    B.
    High labour and handling cost.
    C.
    High shutdown time requirement for emptying, cleaning and refilling.
    D.
    All (a), (b)and(c).

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