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Chemical Engineering :: Chemical Reaction Engineering

  1. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.

  2. A.
    stirred tank
    B.
    tubular flow
    C.
    batch
    D.
    fixed bed

  3. What is the Thiele modulus of the solid catalysed first order reaction, , if the pore diffusion offers negligible resistance to reaction ?

  4. A.
    < 5
    B.
    < 0.5
    C.
    > 1
    D.
    5

  5. B.E.T. method can be used to determine the __________ of a porous catalyst.

  6. A.
    solid density
    B.
    pore volume
    C.
    surface area
    D.
    all (a), (b) and (c)

  7. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?

  8. A.
    Time
    B.
    Useful volume of the tank
    C.
    Diameter of the reactor
    D.
    None of these

  9. For reactions in parallel viz A P (desired product) and A Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

  10. A.
    batch reactor is preferred over a single CSTR for high yield.
    B.
    tubular reactor is preferred over a single CSTR for high yield.
    C.
    both (a) and (b).
    D.
    single CSTR is the most suitable.

  11. For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.

  12. A.
    8
    B.
    16
    C.
    1/8
    D.
    1/16

  13. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will

  14. A.
    remain the same
    B.
    be halved
    C.
    also be. doubled
    D.
    become one fourth

  15. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.

  16. A.
    increases
    B.
    decreases
    C.
    remains unaffected
    D.
    unpredictable from the data

  17. The rate constant of a chemical reaction increases by increasing the

  18. A.
    temperature
    B.
    pressure
    C.
    reactant's concentration
    D.
    none of these

  19. The catalytic activity of enzymes is due to their capacity to lower the __________ energy.

  20. A.
    activation
    B.
    potential
    C.
    kinetic
    D.
    none of these