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Chemical Engineering :: Chemical Reaction Engineering

  1. In a semi-batch reactor

  2. A.
    velocity of reaction can be controlled.
    B.
    maximum conversion can be controlled.
    C.
    both the reactants flow counter-currently.
    D.
    residence time is constant.

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  3. A trickle bed reactor is the one, which

  4. A.
    has altogether three streams either entering or leaving.
    B.
    processes three reactants at different flow rates.
    C.
    processes three reactants with same flow rate.
    D.
    employs all the three phases (i.e.. .solid, liquid and gas).

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  5. The excess energy of the reactants required to dissociate into products is known as the __________ energy.

  6. A.
    thermal
    B.
    activation
    C.
    threshold
    D.
    binding

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  7. In a/an __________ vessel, the fluid enters and leaves following plug flow.

  8. A.
    open
    B.
    closed
    C.
    open-closed
    D.
    close-opened

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  9. Shift conversion reaction

  10. A.
    converts N2 and H2 into NH3.
    B.
    converts CO to CO2 with steam.
    C.
    is non-catalytic.
    D.
    is highly exothermic.

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  11. The importance of diffusion in a catalyst are increased by

  12. A.
    large catalyst particle size.
    B.
    an active surface of the catalyst.
    C.
    small pore diameter.
    D.
    all (a), (b) and (c).

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  13. A back mix reactor is

  14. A.
    suitable for gas phase reactions.
    B.
    ideal at very low conversion.
    C.
    same as plug flow reactor (PFR).
    D.
    same as ideal stirred tank reactor.

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  15. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?

  16. A.
    Pore diffusion
    B.
    Film diffusion
    C.
    Ash layer diffusion
    D.
    Chemical reaction

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  17. The rate of the heterogenous catalytic reaction A(g) + B(g) C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is

  18. A.
    absorption of A.
    B.
    surface reaction between absorbed A and absorbed B.
    C.
    surface reaction between absorbed A and B in the gas phase.
    D.
    surface reaction between A in the gas phase and absorbed B.

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  19. For a __________ order chemical reaction, , the half life period is independent of the initial concentration of the reactant A.

  20. A.
    zero
    B.
    first
    C.
    second
    D.
    third

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