Chemical Engineering MCQs

Page No. 576

For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is ___________________?


a1


b> 1


c


d≥ 1


View Answer

The energy of activation of a chemical reaction ?


aIs same as heat of reaction at constant pressure


bIs the minimum energy which the molecules must have before the reaction can take place


cVaries as fifth power of the temperature


dBoth B. and C.



If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________?


aPorosity is very important


bPorosity is of less importance


cInternal surface area is utilised efficiently


dNone of these



With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?


aHigher in P.F. reactor


bHigher in CSTR


cSame in both the reactors


dData insufficient; can’t be predicted



Space time in flow reactor is____________________?


aUsually equal to the residence time


bThe reciprocal of the space velocity


cA measure of its capacity


dBoth A. and B.


View Answer Both A. and B.

The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?


aAutocatalytic


bAutocatalytic


cEndothermic


dAutothermal


View Answer Autocatalytic

The order of a chemical reaction is__________________?


aAn experimentally determined quantity


bAlways equal to the total stoichiometric number of reactants


cNever fractional


dNone of these



The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the_________________?


aIncreased temperature reduces the activation energy


bFraction of molecules having threshold energy increases


cCollision frequency increases


dValue of threshold energy decreases



In an ideal P.F.R. at steady state conditions ___________________?


aThe composition of reactants remains constant along a flow path


bThe conversion of the reactant varies from point to point along a flow path


cThere is no lateral mixing of fluid


dThere may be diffusion along the flow path



Promoter_____________________?


aInitiates a chemical reaction and is a catalyst by itself


bAlters the position of equilibrium in a reversible reaction


cIncreases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals


dAll A., B. and C.



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