GATE CH Chemical Reaction Engineering PYQs & Answers — Page 3

Questions 21–30 of 70. Imported answers require independent review unless marked reviewed.

A first-order liquid phase reaction

is carried out in two isothermal plug flow reactors (PFRs) of volume 1 m

each, connected in series. The feed flow rate and concentration of

to the first reactor are 10 m

and 1 kmol m

, respectively. At steady-state, the concentration of

at the exit of the second reactor is 0.2 kmol m

. If the two PFRs are replaced by two equal-volume continuously stirred tank reactors (CSTRs) to achieve the same overall steady-state conversion, the volume of each CSTR, in m

, is

Your answerChoose one option.

1.54

3.84

7.28

1.98

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The residence time distribution,

, for a non-ideal flow reactor is given in the figure. A first-order liquid phase reaction with a rate constant 0.2 min

is carried out in the reactor. For an inlet reactant concentration of 2 mol L

, the reactant concentration (in mol L

) in the exit stream is

Diagram for Chemical Engineering question 46

Your answerChoose one option.

0.905

0.452

1.902

0.502

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A chemostat with cell recycle is shown in the figure. The feed flow rate and culture volume are

L h

and

L, respectively. The glucose concentration in the feed

g L

. Assume Monod kinetics with specific cell growth rate

, where

and

g L

. Assume maintenance and death rates to be zero, input feed to be sterile (

) and steady-state operation. The glucose concentration in the recycle stream,

, in g L

, rounded off to 1 decimal place, is ________

Diagram for Chemical Engineering question 62

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CO and H

participate in a catalytic reaction. The partial pressures (in atm) of the reacting species CO and H

in the feed stream are

and

, respectively. While CO undergoes molecular adsorption, H

adsorbs via dissociative adsorption, that is, as hydrogen atoms. The equilibrium constants (in atm

) corresponding to adsorption of CO and H

to the catalyst sites are

and

, respectively. Total molar concentration of active sites per unit mass of the catalyst is

(in mol.(g cat)

). Both the adsorption steps are at equilibrium. Which one of the following expressions is the CORRECT ratio of the concentration of catalyst sites occupied by CO to that by hydrogen atoms?

Your answerChoose one option.

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Fresh catalyst is loaded into a reactor before the start of the following catalytic reaction:

The catalyst gets deactivated over time. The instantaneous activity

, at time

, is defined as the ratio of the rate of the reaction

(mol·(g cat)

·hr

) to the rate of reaction with fresh catalyst. Controlled experimental measurements led to an empirical correlation

where

is in hours. The activity of the catalyst at

hr is ______ (rounded off to one decimal place).

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A unimolecular, irreversible liquid-phase reaction

was carried out in an ideal batch reactor at temperature

. The rate of the reaction (

) measured at different conversions

is given in the table below. This reaction is also carried out in an ideal continuous stirred tank reactor (CSTR) at the same temperature

with a feed concentration of 1 mol m

, under steady-state conditions. For a conversion of 0.8, the space time (in s) of the CSTR is ______ (in integer).

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An irreversible liquid-phase second-order reaction

with rate constant

liter·mol

·min

, is carried out in an isothermal non-ideal reactor. A tracer experiment conducted on this reactor resulted in a residence time distribution (

-curve) as shown in the figure below. The areas of the rectangles (i), (ii) and (iii) are equal. Pure

at a concentration of 1.5 mol·liter

is fed to the reactor. The segregated model mimics the nonideality of the reactor. The percentage conversion of

at the exit of the reactor is _____ (rounded off to the nearest integer).

Diagram for Chemical Engineering question 60

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The reaction

is carried out isothermally on a porous catalyst. The intrinsic reaction rate is

, where

is the rate constant and

is the concentration of

. If the reaction is strong pore-diffusion controlled, the observed order of the reaction is

Your answerChoose one option.

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In an enzymatic reaction, an inhibitor (I) competes with the substrate (S) to bind with the enzyme (E), thereby reducing the rate of product (P) formation. The competitive inhibition follows the reaction mechanism shown below. Let [S] and [I] be the concentration of S and I, respectively, and

be the rate of consumption of S. Assuming pseudo-steady state, the correct plot of

Diagram for Chemical Engineering question 27

Your answerChoose one option.

Diagram for Chemical Engineering question 27 (figure 2)

Diagram for Chemical Engineering question 27 (figure 3)

Diagram for Chemical Engineering question 27 (figure 4)

Diagram for Chemical Engineering question 27 (figure 5)

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Consider the process flowsheet in the figure. An irreversible liquid-phase reaction

(reaction rate

kmol m

) occurs in a 1 m

continuous stirred tank reactor (CSTR), where

is the mole fraction of A. A small amount of inert,

, is added to the reactor. The reactor effluent is separated in a perfect splitter to recover pure

product down the bottoms and a B-free distillate. A fraction of the distillate is purged and the rest is recycled back to the reactor. At a particular steady state, the product rate is 100 kmol h

, the recycle rate is 200 kmol h

and the purge rate is 10 kmol h

. Given the above information, the inert feed rate into the process is __________ kmol h

(rounded off to two decimal places).

Diagram for Chemical Engineering question 50

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GATE CH Chemical Reaction Engineering PYQs

Question 45

Question 46

Question 62

Question 43

Question 58

Question 59

Question 60

Question 26

Question 27

Question 50