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Chemical Engineering :: Chemical Reaction Engineering

  1. The energy balance equation over a tubular reactor under transient conditions is

  2. A.

     An ordinary non-linear differential equation

    B.

     An algebric differential equation

    C.

     A linear partial differential equation

    D.

     A non-linear partial differential equation


  3. Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

  4. A.

     Langmuir

    B.

     There is no dynamic equilibrium between successive layer

    C.

     The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

    D.

     None of these


  5. A space velocity of 5 hr⁻¹ means that

  6. A.

     Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour

    B.

     After every 5 hours, reactor is being filled with the feed

    C.

     Cent per cent conversion can be achieved in at least 5 hours

    D.

     A fixed conversion of a given batch of feed takes 5 hours


  7. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.

  8. A.

     Increase

    B.

     Increase exponentially

    C.

     Decrease

    D.

     Remain unchanged


  9. For multiple reactions, the flow pattern within the vessel affects the

  10. A.

     Size requirement

    B.

     Distribution of reaction products

    C.

     Both A and B

    D.

     Neither A nor B


  11. If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)

  12. A.

     Decreases

    B.

     Increases

    C.

     Remains unaltered

    D.

     Changes unpredictably


  13. The temperature dependence of reaction rate constant (K) by Arhenius law is given by

  14. A.

     K α e-E/RT

    B.

     K α eE/RT

    C.

     K α T . e-E/RT

    D.

     K α √T . e-E/RT


  15. Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?

  16. A.

     CA0 Vs t1/2

    B.

     Ln CA0 Vs t1/2

    C.

     CA0 Vs ln t1/2

    D.

     Ln CA0 Vs ln t1/2


  17. For a tubular flow reactor with uniform concentration and temperature, the independent variable is

  18. A.

     Time

    B.

     Length

    C.

     Diameter

    D.

     None of these


  19. A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is

  20. A.

     0.33

    B.

     0.5

    C.

     1

    D.

     Data insufficient, can't be predicted