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Chemical Engineering GATE 2016 Questions with Answer

Ques 1 Chemical Engineering Economics

Two design options for a distillation system are being compared based on the total annual cost. Information available is as follows:

Option P Option Q
Installed cost of the system (Rs in lakhs) 150 120
Cost of cooling water for condenser (Rs in lakhs/year) 6 8
Cost of steam for reboiler (Rs in lakhs/year) 16 20
The annual fixed charge amounts to 12% of the installed cost. Based on the above information, what is the total annual cost (Rs in lakhs /year) of the better option?

A

(A) 40

B

(B) 42.4

C

(C) 92

D

(D) 128


Ques 2 Chemical Engineering Economics

Terms used in engineering economics have standard definitions and interpretations. Which one of the following statements is INCORRECT?

A

(A) The profitability measure ‘return on investment’ does not consider the time value of money

B

(B) A cost index is an index value for a given time showing the cost at that time relative to a certain base time

C

(C) The ‘six-tenths factor rule’ is used to estimate the cost of an equipment from the cost of a similar equipment with a different capacity

D

(D) Payback period is calculated based on the payback time for the sum of the fixed and the working capital investment


Ques 3 Chemical Engineering Economics

A vertical cylindrical tank with a flat roof and bottom is to be constructed for storing 150 m3 of ethylene glycol. The cost of material and fabrication for the tank wall is Rs 6000 per m2 and the same for the roof and the tank bottom are Rs 2000 and Rs 4000 per m2, respectively. The cost of accessories, piping and instruments can be taken as 10% of the cost of the wall. 10% of the volume of the tank needs to be kept free as vapour space above the liquid storage. What is the optimum diameter (in m) for the tank?

A

(A) 3.5

B

(B) 3.9

C

(C) 7.5

D

(D) 7.8


Ques 4 Chemical Reaction Engineering

For a non-catalytic homogeneous reaction A → B, the rate expression at 300 K is –rA (mol m-3 s-1) = 10 CA / (0.5 + CA), where CA is the concentration of A (in mol/m3). Theoretically, the upper limit for the magnitude of the reaction rate (–rA in mol m-3 s-1, rounded off to the first decimal place) at 300 K is _______.


Ques 5 Chemical Reaction Engineering

The variations of the concentrations (CA, CR and CS) for three species (A, R and S) with time, in an isothermal homogeneous batch reactor are shown in the figure below.

Select the reaction scheme that correctly represents the above plot. The numbers in the reaction schemes shown below, represent the first order rate constants in unit of s-1.

A

B

C

D


Ques 6 Chemical Reaction Engineering

Hydrogen iodide decomposes through the reaction 2HI ⇌ H2 + I2. The value of the universal gas constant R is 8.314 J mol-1 K-1. The activation energy for the forward reaction is 184000 J mol-1. The ratio (rounded off to the first decimal place) of the forward reaction rate at 600 K to that at 550 K is _______.


Ques 7 Chemical Reaction Engineering

A porous pellet with Pt dispersed in it is used to carry out a catalytic reaction. Following two scenarios are possible. Scenario 1: Pt present throughout the pores of the pellet is used for catalyzing the reaction. Scenario 2: Pt present only in the immediate vicinity of the external surface of the pellet is used for catalyzing the reaction. At a large value of Thiele modulus, which one of the following statements is TRUE?

A

(A) Since the reaction rate is much greater than the diffusion rate, Scenario 1 occurs

B

(B) Since the reaction rate is much greater than the diffusion rate, Scenario 2 occurs

C

(C) Since the reaction rate is much lower than the diffusion rate, Scenario 1 occurs

D

(D) Since the reaction rate is much lower than the diffusion rate, Scenario 2 occurs


Ques 8 Chemical Reaction Engineering

A CSTR has a long inlet pipe. A tracer is injected at the entrance of the pipe. The E-curve obtained at the exit of the CSTR is shown in the figure below.

Assuming plug flow in the inlet pipe, the ratio (rounded off to the second decimal place) of the volume of the pipe to that of the CSTR is _______


Ques 9 Chemical Reaction Engineering

A liquid phase irreversible reaction A → B is carried out in an adiabatic CSTR operating under steady state conditions. The reaction is elementary and follows the first order rate law. For this reaction, the figure below shows the conversion (X_A) of A as a function of temperature (T) for different values of the rate of reaction (-r_A in mol m^{-3} s^{-1}) denoted by the numbers to the left of each curve. This figure can be used to determine the rate of the reaction at a particular temperature, for a given conversion of A.

The inlet stream does not contain B and the concentration of A in the inlet stream is 5 mol/m3. The molar feed rate of A is 100 mol/s. A steady state energy balance for this CSTR results in the following relation: T = 350 + 25 X_A where T is the temperature (in K) of the exit stream and X_A is the conversion of A in the CSTR. For an exit conversion of 80% of A, the volume (in m3, rounded off to the first decimal place) of CSTR required is _______


Ques 10 Chemical Technology

India has no elemental sulphur deposits that can be economically exploited. In India, which one of the following industries produces elemental sulphur as a by-product?

A

(A) Coal carbonisation plants

B

(B) Petroleum refineries

C

(C) Paper and pulp industries

D

(D) Iron and steel making plants


Ques 11 Chemical Technology

Two paper pulp plants P and Q use the same quality of bamboo as a raw material. The chemicals used in their digester are as follows:

Plant P Plant Q
NaOH Yes No
Na₂S Yes No
Na₂CO₃ Yes Yes
NaHCO₃ No Yes
Na₂SO₃ No Yes
Which one of the following statements is CORRECT?

A

(A) Plant P and Plant Q both use the Sulfite process

B

(B) Plant P and Plant Q both use the Kraft process

C

(C) Plant P uses Sulfite process

D

(D) Plant P uses Kraft process


Ques 12 Chemical Technology

Match the industrial processes in Group-1, with the catalyst materials in Group-2.

Group-1 Group-2
P) Ethylene polymerisation I) Nickel
Q) Petroleum feedstock cracking II) Vanadium pentoxide
R) Oxidation of SO₂ to SO₃ III) Zeolite
S) Hydrogenation of oil IV) Aluminium triethyl with titanium chloride promoter

A

(A) P-IV, Q-III, R-II, S-I

B

(B) P-I, Q-IV, R-III, S-II

C

(C) P-I, Q-II, R-III, S-IV

D

(D) P-II, Q-III, R-IV, S-I


Ques 13 Chemical Technology

A catalytic reforming plant produces hydrogen and benzene from cyclohexane by de-hydro aromatisation. In order to increase the production of hydrogen, the owner plans to change the process to steam reforming of the same feedstock that produces hydrogen and carbon dioxide. Stoichiometrically, what is the maximum ratio of pure hydrogen produced in the proposed process to that in the existing process?

A

(A) 1

B

(B) 2

C

(C) 5

D

(D) 6


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