Chemical Engineering MCQs

Page No. 553

Exothermic reactions are best carried out in ________________?


aA CSTR

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bCSTR in series

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cA plug flow reactor followed by CSTR

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dCSTR followed by a plug flow reactor

✓



The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the__________________?


aReaction is elementary with a molecularity of 2

✓


bMolecularity of the reaction is 2, but the reaction may not be elementary

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cReaction may be elementary with molecularity of 2

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dReaction is elementary but the molecularity may not be 2

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Backmixing is most predominant in___________________?


aA well stirred batch reactor

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bA plug-flow reactor

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cA single CSTR

✓


dCSTR’s connected in series

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View Answer A single CSTR

For the chemical reaction X → Y, it is observed that, on doubling the concentration of ‘X’, the reaction rate quadruples. If the reaction rate is proportional to Cx n, then what is the value of „n‟ ?


a1/4

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b2

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c4

✓


d16

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View Answer 4

An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is ___________________?


aMaximum at the inlet of the reactor

✓


bMaximum at the exit of the reactor

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cMaximum at the centre of the reactor

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dConstant throughout the reactor

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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 ?


aAt high P and high T

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bAt low P and high T

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cAt low P and low T

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dAt high P and low T

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View Answer At low P and low T

The excess energy of the reactants required to dissociate into products is known as the ________________ energy?


aThermal

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bActivation

✓


cThreshold

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dThreshold

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View Answer Activation

The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?


aZero

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bFirst

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cSecond

✓


dNone of these

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View Answer Second

An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction ?


aIs maximum at the inlet of the reactor

✓


bGoes through a maximum along the length of the reactor

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cGoes through a minimum along the length of the reactor

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dIs maximum at the exit of the reactor

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Which of the following factors control the deactivation of a porous catalyst pellet?


aDecay reactions

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bPore diffusion

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cForm of surface attack by poison

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dAll A., B. and C.

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View Answer All A., B. and C.

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