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Chemical Engineering :: Chemical Reaction Engineering

  1. A photochemical reaction is

  2. A.

     Accompanied with emission of light

    B.

     Catalysed by light

    C.

     Initiated by light

    D.

     All of the above


  3. A rise in temperature

  4. A.

     Normally tends to increase the reaction rate

    B.

     Does not affect a catalysed reaction

    C.

     Does not affect photo-chemical reaction rates

    D.

     All of the above


  5. Pick out the wrong statement pertaining to space velocity of flow reactors.

  6. A.

     The unit of space velocity is (time)⁻¹

    B.

     The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour

    C.

     The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor

    D.

     None of these


  7. A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by

  8. A.

     Diffusion within the pellet

    B.

     Reaction

    C.

     External mass transfer

    D.

     None of the above


  9. Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇋ 2NH₃.

  10. A.

     Increases

    B.

     Decreases

    C.

     Remains unchanged

    D.

     Unpredictable from the data


  11. Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.

  12. A.

     First

    B.

     Zero

    C.

     Second

    D.

     Third


  13. The unit of frequency factor in Arhenious equation is

  14. A.

     Same as that of rate constant

    B.

     Same as that of activation energy

    C.

     Dimensionless

    D.

     None of these


  15. The rate of reaction of a/an __________ reaction is not affected by temperature rise.

  16. A.

     Autocatalytic

    B.

     Photochemical

    C.

     Consecutive

    D.

     Zero order


  17. For a first order chemical reaction, the rate constant

  18. A.

     Changes on changing the concentration units

    B.

     Is not a function of the unit of time

    C.

     Has unit of time⁻¹

    D.

     None ofthese


  19. When a catalyst increases the rate of chemical reaction, the rate constant

  20. A.

     Decreases

    B.

     Increases

    C.

     Remains constant

    D.

     Becomes infinite