Chemical Engineering Gate Yearwise 


Chemical Engineering GATE 2019 Questions with Answer

Ques 1 Chemical Reaction Engineering

The desired liquid-phase reaction
D + E → k1F      rF = k1 CD2 CE0.3

is accompanied by an undesired side reaction
D + E → k2G      rG = k2 CD0.4 CE1.5

Four isothermal reactor schemes (CSTR: ideal Continuous-Stirred Tank Reactor; PFR: ideal Plug Flow Reactor) for processing equal molar feed rates of D and E are shown in figure.
Each scheme is designed for the same conversion.
The scheme that gives the most favorable product distribution is:

A

B

C

D


Ques 2 Chemical Reaction Engineering

For a first order reaction in a porous spherical catalyst pellet, diffusional effects are most likely to lower the observed rate of reaction for

A

slow reaction in a pellet of small diameter

B

slow reaction in a pellet of large diameter

C

fast reaction in a pellet of small diameter

D

fast reaction in a pellet of large diameter


Ques 3 Chemical Reaction Engineering

The elementary, irreversible, liquid-phase, parallel reactions, 2A → D and 2A → U, take place in an isothermal non-ideal reactor. The C-curve measured in a tracer experiment is shown in the figure, where C(t) is the concentration of the tracer in g/m3 at the reactor exit at time t (in min).

The rate constants are k1 = 0.2 Liter/(mol min) and k2 = 0.3 Liter/(mol min). Pure A is fed to the reactor at a concentration of 2 mol/Liter. Using the segregated model, the percentage conversion in the reactor is ______ (rounded off to the nearest integer).

65 is the correct answer.


Ques 4 Chemical Reaction Engineering

A first-order irreversible liquid phase reaction A → B (k = 0.1 min-1) is carried out under isothermal, steady state conditions in the following reactor arrangement comprising an ideal CSTR (Continuous-Stirred Tank Reactor) and two ideal PFRs (Plug Flow Reactors). From the information in the figure, the volume of the CSTR (in Liters) is ______ (rounded off to the nearest integer).

855 is the correct answer.


Ques 5 Chemical Reaction Engineering

The elementary liquid-phase irreversible reactions
k1 = 0.4 min-1 A → B
k2 = 0.1 min-1 → C
take place in an isothermal ideal CSTR (Continuous-Stirred Tank Reactor). Pure A is fed to the reactor at a concentration of 2 mol/Liter. For the residence time that maximizes the exit concentration of B, the percentage yield of B, defined as (net formation rate of B / consumption rate of A) × 100, is ______ (rounded off to the nearest integer).

67 is the correct answer.


Ques 6 Chemical Reaction Engineering

The elementary irreversible gas-phase reaction A → B + C is carried out adiabatically in an ideal CSTR (Continuous-Stirred Tank Reactor) operating at 10 atm. Pure A enters the CSTR at a flow rate of 10 mol/s and a temperature of 450 K. Assume A, B and C to be ideal gases. The specific heat capacity at constant pressure (CP) and heat of formation (H°), of component i (i = A, B, C), are:
CPA = 30 J/(mol K), H°A = -90 kJ/mol
CPB = 10 J/(mol K), H°B = -54 kJ/mol
CPC = 20 J/(mol K), H°C = -45 kJ/mol
The reaction rate constant k (per second) = 0.133 exp(-E/RT) where E = 31.4 kJ/mol and universal gas constant R=0.082 L atm/(mol K) = 8.314 J/(mol K). The shaft work may be neglected in the analysis, and specific heat capacities do not vary with temperature. All heats of formation are referenced to 273 K. The reactor volume (in Liters) for 75% conversion is ______ (rounded off to the nearest integer).

134 is the correct answer.


Ques 7 Chemical Reaction Engineering

Consider the reactor-separator-recycle process operating under steady state conditions as shown in the figure. The reactor is an ideal Continuous-Stirred Tank Reactor (CSTR), where the reaction A + B → C occurs. Assume that there is no impurity in the product and recycle streams. Other relevant information are provided in the figure. The mole fraction of B (xB) in the reactor that minimizes the recycle rate is ______ (rounded off to two decimal places).

0.10 is the correct answer.


Ques 8 Chemical Technology

Producer gas is obtained by:

A

passing air through red hot coke

B

thermal cracking of naphtha

C

passing steam through red hot coke

D

passing air and steam through red hot coke


Ques 9 Chemical Technology

In Kraft process, the essential chemical reagents used in the digester are:

A

caustic soda, mercaptans and ethylene oxide

B

caustic soda, sodium sulphide and soda ash

C

quick lime, salt cake and dimethyl sulphide

D

baking soda, sodium sulphide and mercaptans


Ques 10 Chemical Technology

The most common catalyst used for oxidation of o-xylene to phthalic anhydride is

A

$V_{2}O_{5}$

B

Pd

C

Pt

D

Ag


Ques 11 Chemical Technology

In petroleum refining operations, the process used for converting paraffins and naphthenes to aromatics is

A

alkylation

B

catalytic reforming

C

hydrocracking

D

isomerization


Ques 12 Chemical Technology

The combination that correctly matches the polymer in Group-1 with the polymerization reaction type in Group-2 is

Group-1 Group-2
P) Nylon 6
Q) Polypropylene
R) Polyester 		I) Condensation polymerization
II) Ring opening polymerization
III) Addition polymerization

A

P-II, Q-I, R-III

B

P-I, Q-III, R-II

C

P-III, Q-II, R-I

D

P-II, Q-III, R-I


Ques 13 Chemical Technology

The combination that correctly matches the process in Group-1 with the entries in Group-2 is

A

P-II, Q-IV, R-III, S-I

B

P-III, Q-IV, R-II, S-I

C

P-IV, Q-I, R-II, S-III

D

P-II, Q-I, R-IV, S-III


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