Chemical Engineering MCQs

Page No. 580

Which of the following holds good for an elementary reaction as shown in the bellow figure ?


aThe rate of disappearance of ‘Y’ is equal to the rate of appearance of ‘Z’


bThe rate of disappearance of ‘Y’ is equal to the rate of disappearance of ‘X’


cThree times the rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’


d The rate of disappearance of ‘X’ is equal to the rate of appearance of ‘Z’



Non-catalytic fluid-solid reactions are represented by _______________ model?


aContinuous reaction


bUnreacted core


cBoth A. and B.


dNeither A. and B.


View Answer Both A. and B.

In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ?


a2O3 ⇌ 3O2


bN2 + O2 ⇌ 2NO


c2NO2 ⇌ N2O4


d2SO2 + O2 ⇌ 2SO3


View Answer N2 + O2 ⇌ 2NO

For all positive reaction orders for a particular duty ?


aMixed reactor is always larger than the plug-flow reactor


bRatio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order


cReactor size is independent of the type of flow


dDensity variation during reaction affects design



What is the value of ‘n’ if the reaction rate of the chemical reaction A → B, is proportional to CA n and it is found that the reaction rate triples, when the concentration of ‘A’ is increased 9 times ?


a1/2


b1/3


c1/9


d3


View Answer 1/2

The exit age distribution curve E(t) for an ideal CSTR with the average residence time, η, is given by__________________?


ae-t/η


be-t/η/η


c1 – e-t/η


d1 – (e-t/η/η)


View Answer e-t/η/η

Limiting reactant in a chemical reaction decides the____________________?


aRate constant


bConversion


cReaction speed


dEquilibrium constant


View Answer Conversion

Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ?


aOperating conditions (e.g. pressure and temperature)


bRate constant


cDensity of mixture


dNone of these


View Answer Density of mixture

The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ?


aE


bE + ΔHA


cE + ΔHA – ΔHR)


dΔHA + ΔHR


View Answer E + ΔHA – ΔHR)

An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed? Data: Heat of reaction = – 50 kJ/mole Density of the reacting mixture = 1000kg/m3 Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition?


a190


b290


c390


d490


View Answer 290

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