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Chemical Engineering :: Chemical Reaction Engineering

  1. For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min⁻¹ . What will be the conversion for a PFR with a space velocity of 0.2 min⁻¹? Assume that all the other operating conditions are the same for CSTR and PFR.

  2. A.

     0.15

    B.

     0.30

    C.

     0.60

    D.

     0.90

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  3. Molecularity of an elementary reaction, P + Q → R + S is

  4. A.

     1

    B.

     2

    C.

     3

    D.

     4

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  5. The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is

  6. A.

     0.5

    B.

     -0.5

    C.

     1

    D.

     1.5

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  7. A catalyst in a chemical reaction

  8. A.

     Decreases the activation energy

    B.

     Alters the reaction mechanism

    C.

     Increases the frequency of collisions of reacting species

    D.

     All of the above

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

  10. A.

     Zero

    B.

     First

    C.

     Second

    D.

     Fractional

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  11. When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as

  12. A.

     ND = (n + 1)/2

    B.

     ND = n/2

    C.

     ND = n + 1

    D.

     None of these

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  13. Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.

  14. A.

     Deposited

    B.

     Chemisorbed

    C.

     Selectivity

    D.

     Stability

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  15. A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.

  16. A.

     Less than

    B.

     Equal to

    C.

     More than

    D.

     Equal to or more than

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  17. BET apparatus

  18. A.

     Measures the catalyst surface area directly

    B.

     Operates at very high pressure

    C.

     Is made entirely of stainless steel

    D.

     None of these

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  19. Which of the following is the most suitable for isothermal operation?

  20. A.

     Batch reactor

    B.

     Back-mix reactor

    C.

     Plug-flow reactor

    D.

     Fixed bed reactor

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