Chemical Engineering MCQs

Page No. 554

Carbon particles accumulated on the catalyst used in the gas oil cracking lies in the category of _____________________ poison?


aDeposited


bChemisorbed


cSelectivity


dStability


View Answer Deposited

For an ideal plug flow reactor, the value of Peclet number is_______________?


a0


b1


c10


d


View Answer 0

In a reversible reaction, a catalyst increases the rate of forward reaction__________________?


aOnly


bTo a greater extent than that of the backward reaction


cAnd decreases that of the backward reaction


dAnd the backward reaction equally



In an ideal mixed reactor (at steady state), the ___________________?


aSpace time is equivalent to holding time for constant density systems


bComposition throughout the reactor remains same


cExit stream has the same composition as the fluid within the reactor


dAll A., B. and C.


View Answer All A., B. and C.

The importance of diffusion in a catalyst are increased by ____________________?


aLarge catalyst particle sizeAn active surface of the catalyst


bAn active surface of the catalyst


cSmall pore diameter


dAll A., B. and C.


View Answer All A., B. and C.

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is ______________ seconds?


a1


b3


c1/3


d32


View Answer 3

With increase in initial concentration, the fractional conversion of a first order reaction in a given time___________________?


aIncreases


bDecreases


cRemain constant


dUnpredictable


View Answer Remain constant

The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are_______________?


a2 & 1


b11 & 2


c2 & 2


d1 & 1


View Answer 2 & 1

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


aPore diffusion


bFilm diffusion


cAsh layer diffusion


dChemical reaction


View Answer Film diffusion

The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?


aK α e-E/RT


bK α eE/RT


cK α T . e-E/RT


dK α √T . e-E/RT


View Answer K α e-E/RT

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