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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


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

  4. A.

     1

    B.

     2

    C.

     3

    D.

     4


  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


  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


  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


  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


  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


  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


  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


  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