Chemical Engineering MCQs

Page No. 553

Exothermic reactions are best carried out in ________________?


aA CSTR


bCSTR in series


cA plug flow reactor followed by CSTR


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


cReaction may be elementary with molecularity of 2


dReaction is elementary but the molecularity may not be 2



Backmixing is most predominant in___________________?


aA well stirred batch reactor


bA plug-flow reactor


cA single CSTR


dCSTR’s connected in series


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


b2


c4


d16


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


cMaximum at the centre of the reactor


dConstant throughout the reactor



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


bAt low P and high T


cAt low P and low T


dAt high P and low T


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


bActivation


cThreshold


dThreshold


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


bFirst


cSecond


dNone of these


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


cGoes through a minimum along the length of the reactor


dIs maximum at the exit of the reactor



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


aDecay reactions


bPore diffusion


cForm of surface attack by poison


dAll A., B. and C.


View Answer All A., B. and C.

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