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Chemical Engineering :: Chemical Reaction Engineering

  1. The reaction between oxygen and organic material is a/an __________ reaction.

  2. A.

     Exothermic

    B.

     Endothermic

    C.

     Biochemical

    D.

     Photochemical


  3. Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

  4. A.

     Temperature should be high in the beginning and decreased towards the end of the reaction

    B.

     Very low temperature should be used throughout the reaction

    C.

     Very high temperature should be used throughout the reaction

    D.

     None of these


  5. A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of

  6. A.

     7

    B.

     6

    C.

     3

    D.

     7/3


  7. The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.

  8. A.

     At high P and high T

    B.

     At low P and high T

    C.

     At low P and low T

    D.

     At high P and low T


  9. A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

  10. A.

     Catalytic

    B.

     Autocatalytic

    C.

     Photochemical

    D.

     None of these


  11. The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

  12. A.

     Biochemical

    B.

     Photochemical

    C.

     Catalytic

    D.

     Autocatalytic


  13. Pick out the wrong statement

  14. A.

     For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR

    B.

     Two mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be plac

    C.

     Arrehenius equation describing the effect of temperature on rate constant is given by, K = A.e-Ea/RT

    D.

     The mechanism for the decomposition of CH₃CHO into CH₄ and CO in presence of I₂ is:
    CH₃CHO +I₂ CH₃I + HI + CO; slow
    CH₃I + HI CH₄ + I₂; fast
    Then the rate of disappearance


  15. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.

  16. A.

     Elementary

    B.

     Non-elementary

    C.

     Parallel

    D.

     Autokinetic


  17. For a first order reaction carried out in a plug flow reactor, the space time is

  18. A.

     1/K In C0/C

    B.

     1/K In C/C0

    C.

     K In C0/C

    D.

     K In C/C0


  19. When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.

  20. A.

     Twice

    B.

     Half

    C.

     Equal

    D.

     None of these