Chemical Engineering MCQs

Page No. 556

When an exothermic reversible reaction is conducted adiabatically, the rate of reaction____________________?


aContinuously increases


bContinuously decreases


cPasses through a maximum


dPasses through a minimum



Reactions with high activation energy are_____________________?


aVery temperature sensitive


bTemperature insensitive


cAlways irreversible


dAlways reversible



The conversion in a mixed reactor/accomplishing a reaction A → 3R is 50% when gaseous reactant ‘A’ is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is _______________ second?


a0.5


b1


c2


d3


View Answer 0.5

A Catalyst ____________________?


aIncreases the equilibrium concentration of the product


bChanges the equilibrium constant of the reaction


cShortens the time to reach the equilibrium


dNone of these



For a mixed flow reactor operating at steady state, the rate of reaction is given by______________?


a(FA0/V) – (dCA/dt)


b(FA0/V) + (dCA/dt)


c(FA0/V) XA


d-(dCA/dt)


View Answer (FA0/V) XA

With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)?


aIncreases


bDecreases


cRemain same


dIncreases linearly


View Answer Increases

The rate of the heterogeneous 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_______________?


aAbsorption of A


bSurface reaction between absorbed A and absorbed B


cSurface reaction between absorbed A and B in the gas phase


dSurface reaction between A in the gas phase and absorbed B



The rate equation for the reaction represented by as shown in the bellow figure, is given by – rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?


aZero order & K1/K2


bZero order & K1


cFirst order & K1


dFirst order & K1/K2


View Answer Zero order & K1/K2

What is the dispersion number for a plug flow reactor ?


a0


b


c1


d-1


View Answer 0

Transition state theory gives the rate constant as__________________?


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 T . e-E/RT

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