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Chemical Engineering :: Chemical Reaction Engineering

  1. For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is

  2. A.

     1

    B.

     -0.5

    C.

     -0.25

    D.

     0


  3. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by

  4. A.

     E-t/τ

    B.

     E-t/τ/T

    C.

     1 - e-t/τ

    D.

     1 - (e-t/τ/T)


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

  6. A.

     Decreases

    B.

     Increases

    C.

     Remains unaffected

    D.

     Decreases linearily with temperature


  7. Arhenious equation shows the variation of __________ with temperature.

  8. A.

     Reaction rate

    B.

     Rate constant

    C.

     Energy of activation

    D.

     Frequency factor


  9. Chemical reaction rate of a component depends upon the

  10. A.

     Composition of the component only

    B.

     Temperature of the system

    C.

     Pressure of the system

    D.

     All of the above


  11. Which of the following is a characteristic of an ideal plug flow reactor?

  12. A.

     Axial dispersion

    B.

     Flat velocity profile

    C.

     Uniform mixing

    D.

     None of these


  13. What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?

  14. A.

     0

    B.

     1

    C.

     2

    D.

     3


  15. A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

  16. A.

     2τ

    B.

     0.5τ

    C.

     τ/0.693

    D.

     0.693τ


  17. An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m³ of each A and B enters the reactor at 8m³ /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?
    (Data: Heat of reaction = - 50 kJ/mole, Density of the reacting mixture = 1000kg/m³, Specific heat of reacting mixture = 2kJ/kg.K)
    The above data can be assumed to be independent of temperature and composition.

  18. A.

     190

    B.

     290

    C.

     390

    D.

     490


  19. Pick out the correct statement.

  20. A.

     In catalytic reactions, the catalyst reacts with the reactants

    B.

     A catalyst initiates a chemical reaction

    C.

     A catalyst lowers the activation energy of the reacting molecules

    D.

     A catalyst can not be recovered chemi cally unchanged at the end of the chemical reaction