Chemical Engineering Gate Yearwise 


Chemical Engineering Gate 2015 Questions with Answer

Ques 1 GATE 2015

Consider two steady isothermal flow configurations shown schematically as Case I and Case II below. In Case I, a CSTR of volume V₁ is followed by a PFR of volume V₂, while in Case II a PFR of volume V₂ is followed by a CSTR of volume V₁. In each case, a volumetric flow rate Q of liquid reactant is flowing through the two units in series. An irreversible reaction A → products (order n) takes place in both cases, with a reactant concentration CA0 being fed into the first unit.
Case I:

Case II:
Choose the correct option:

A

CAfI/CAfII > 1 for n=1

B

CAfI/CAfII = 1; for n=1

C

CAfI/CAfII < 1 for n=1

D

CAfI/CAfII = 1 for n>0


(b) is the correct answer.

Ques 2 GATE 2015

A catalyst slab of half-thickness L (the width and length of the slab >> L) is used to conduct the first order reaction A → B. At 450 K, the Thiele modulus for this system is 0.5. The activation energy for the first order rate constant is 100 kJ/mol. The effective diffusivity of the reactant in the slab can be assumed to be independent of temperature, and external mass transfer resistance can be neglected. If the temperature of the reaction is increased to 470 K, then the effectiveness factor at 470 K (up to two decimal places) will be ______.
Value of universal gas constant = 8.314 J/mol. K.


(0.80) is the correct answer.

Ques 3 GATE 2015

The impulse response to a tracer pulse experiment for a flow reactor is given below: In the above figure, C is the exit tracer concentration.

The corresponding E or Eθ (normalized E) curve is correctly represented by which of the following choices? Here, θ is dimensionless time.

A

B

C

D


(b) is the correct answer.

Ques 4 GATE 2015

An isothermal steady state mixed flow reactor (CSTR) of 1 m³ volume is used to carry out the first order liquid-phase reaction A → products. Fresh feed at a volumetric flow rate of Q containing reactant A at a concentration CA0 mixes with the recycle stream at a volumetric flow rate RQ as shown in the figure below.

It is observed that when the recycle ratio R = 0.5, the exit conversion XAf = 50%. When the recycle ratio is increased to R = 2, the new exit conversion (in percent) will be:

A

50.0

B

54.3

C

58.7

D

63.2


(d) is the correct answer.

Ques 5 GATE 2015

Which of the following can change if only the catalyst is changed for a reaction system?

A

Enthalpy of reaction

B

Activation energy

C

Free energy of the reaction

D

Equilibrium constant.


(b) is the correct answer.

Ques 6 GATE 2015

For which reaction order, the half-life of the reactant is half of the full lifetime (time for 100% conversion) of the reactant?

A

Zero order

B

Half order

C

First order

D

Second order


(a) is the correct answer.

Ques 7 GATE 2015

An irreversible, homogeneous reaction A → products, has the rate expression: Rate = (2CA2 + 0.1CA) / (1 + 50CA), where CA is the concentration of A. CA varies in the range 0.5 – 50 mol/m3. For very high concentrations of A, the reaction order tends to:

A

0

B

1

C

1.5

D

2


(a) is the correct answer.

Ques 8 GATE 2015

The schematic diagram of a steady state process is shown below. The fresh feed (F) to the reactor consists of 96 mol% reactant A and 4 mol% inert I. The stoichiometry of the reaction is A → C. A part of the reactor effluent is recycled. The molar flow rate of the recycle stream is 0.3 F. The product stream P contains 50 mol% C. The percentage conversion of A in the reactor based on A entering the reactor at point 1 in the figure (up to one decimal place) is _______.


(45.0) is the correct answer.

Ques 9 GATE 2015

Select the WRONG statement regarding water gas shift converters from the list below

A

Inter-stage cooling is provided between the two stages of shift converters.

B

Usually high temperature shift (HTS) reactor has a iron-based catalyst and low temperature shift (LTS) reactor has a copper-based catalyst.

C

HTS reactor is followed by LTS reactor.

D

LTS reactor is followed by HTS reactor.


(d) is the correct answer.

Ques 10 GATE 2015

Match the polymer mentioned on the left with the catalyst used for its manufacture given on the right.

Group 1 Group 2
I. Low density Polyethylene P. Ziegler-Natta catalyst
II. High density Polyethylene Q. Traces of Oxygen
III. Polyethylene Terephthalate R. Butyl Lithium
IV. Polyvinyl Chloride S. Antimony

A

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

B

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

C

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

D

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


(c) is the correct answer.

Ques 11 GATE 2015

Match the technologies in Group 1 with the entries in Group 2

Group 1 Group 2
P. Urea manufacture IV. Prilling tower
Q. Coal gasification VI. Gas-solid non-catalytic reaction
R. Controlled release of chemicals I. Microencapsulation
S. Deep hydrodesulphurization II. Ultra-low sulphur diesel

A

P-I, Q-V, R-II, S-VI

B

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

C

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

D

P-V, Q-VI, R-IV, S-II


(b) is the correct answer.

Ques 12 GATE 2015

Match the chemicals written on the left with the raw materials required to produce them mentioned on the right:

Group 1 Group 2
I. Low density Polyethylene Q. Traces of Oxygen
II. High density Polyethylene P. Ziegler-Natta catalyst
III. Polyethylene Terephthalate S. Antimony
IV. Polyvinyl Chloride R. Butyl Lithium

A

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

B

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

C

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

D

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


(c) is the correct answer.

Ques 13 GATE 2015

The following set of three vectors

is linearly dependent when x is equal to

A

0

B

1

C

2

D

3


(d) is the correct answer.

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