Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2150403 Basics Of Reaction Engineering Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2150403 Date:16/11/2018
Subject Name:Basics of Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Discuss the different ways in which rate of reaction can be defined. 03
(b) What do you understand by instantaneous fractional yield and overall
fraction yield of a product?
04
(c) Write a short note on differential method and integral method of analysis
of kinetic data.
07
Q.2 (a) Find the conversion for the reaction A ? R, after 1 hour in a batch reactor.
-r A = 3CA mol/lit.hr, C Ao = 1 mol/lit.
03
(b) Define and explain the following terms:
i) Series reactions ii) Parallel reactions
iii) Molecularity iv) Rate constant
04
(c) Derive the CRmax and tRmax for the first order reactions given below:
A ? R ? S
07
OR
(c) Find the overall order of the irreversible reaction,
2H2 + 2NO ? N2 + 2H2O
at 296 K from the following constant volume data using equimolar amount
of hydrogen and nitric oxide.
Total Pressure, mmHg 200 240 280 320 360
Half life, sec 265 186 115 107 67
07
Q.3 (a) Explain different types of ideal reactors. 03
(b) Explain the classification of reaction in details with examples. 04
(c) The rate constant of a reaction is measured at different temperatures is
reported below. Calculate the activation energy for this reaction.
Temperature, K 273 293 303 313
Rate constant, k,
sec
-1
2.46 x 10
5
47.5 x 10
5
576 x 10
5
5480 x 10
5
07
OR
Q.3 (a) Write a brief note on variable volume batch reactor. 03
(b) Consider a feed C Ao = 200, CBo = 200, Cio = 100 (inert) to a steady flow
reactor. The isothermal gas phase reaction is A + 3B ? 6R. If C A = 40 at
the reactor exit, what is CB, XA and XB there?
04
(c) Derive an expression to determine the kinetics by integral method for the
irreversible bi-molecular elementary reaction of 2
nd
order of the type
2A ? R, -rA = kCA
2
07
Q.4 (a) Derive the performance equation of ideal batch reactor. 03
(b) Show that for a first order irreversible reaction ln(1/(1 - xA)) = kt. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2150403 Date:16/11/2018
Subject Name:Basics of Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Discuss the different ways in which rate of reaction can be defined. 03
(b) What do you understand by instantaneous fractional yield and overall
fraction yield of a product?
04
(c) Write a short note on differential method and integral method of analysis
of kinetic data.
07
Q.2 (a) Find the conversion for the reaction A ? R, after 1 hour in a batch reactor.
-r A = 3CA mol/lit.hr, C Ao = 1 mol/lit.
03
(b) Define and explain the following terms:
i) Series reactions ii) Parallel reactions
iii) Molecularity iv) Rate constant
04
(c) Derive the CRmax and tRmax for the first order reactions given below:
A ? R ? S
07
OR
(c) Find the overall order of the irreversible reaction,
2H2 + 2NO ? N2 + 2H2O
at 296 K from the following constant volume data using equimolar amount
of hydrogen and nitric oxide.
Total Pressure, mmHg 200 240 280 320 360
Half life, sec 265 186 115 107 67
07
Q.3 (a) Explain different types of ideal reactors. 03
(b) Explain the classification of reaction in details with examples. 04
(c) The rate constant of a reaction is measured at different temperatures is
reported below. Calculate the activation energy for this reaction.
Temperature, K 273 293 303 313
Rate constant, k,
sec
-1
2.46 x 10
5
47.5 x 10
5
576 x 10
5
5480 x 10
5
07
OR
Q.3 (a) Write a brief note on variable volume batch reactor. 03
(b) Consider a feed C Ao = 200, CBo = 200, Cio = 100 (inert) to a steady flow
reactor. The isothermal gas phase reaction is A + 3B ? 6R. If C A = 40 at
the reactor exit, what is CB, XA and XB there?
04
(c) Derive an expression to determine the kinetics by integral method for the
irreversible bi-molecular elementary reaction of 2
nd
order of the type
2A ? R, -rA = kCA
2
07
Q.4 (a) Derive the performance equation of ideal batch reactor. 03
(b) Show that for a first order irreversible reaction ln(1/(1 - xA)) = kt. 04
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2
(c) The irreversible reaction A + B ? AB has been studied kinetically, and
the rate of formation of product has been found to be well correlated by
the following rate equation: r AB = kCB
2
, ?. independent of CA.
What reaction mechanism is suggested by this rate expression if the
chemistry of the reaction suggests that the intermediate consists of an
association of reactant molecules and that a chain reaction does not occur?
07
OR
Q.4 (a) How mixing of different composition of fluid is the key to the formation
of intermediate for irreversible reactions in series?
03
(b) Liquid A decomposes by first order kinetics, and in a batch reactor 50%
of A is converted in 5 minutes. How long it will take to reach 75%
conversion?
04
(c) Write a brief note on variable volume batch reactor. 07
Q.5 (a) Derive the performance equation of ideal plug flow reactor (PFR). 03
(b) Write a short note on optimum temperature progression. 04
(c) Define autocatalytic reactions. Derive an expression to find its kinetics.
Explain plots of rate of reaction Vs. time and concentration Vs. time
07
OR
Q.5 (a) Explain the size comparison of single ideal CSTR with PFR and mention
the different parameter affecting the sizes of the reactor.
03
(b) Define recycle ratio. Derive the design equation of Recycle reactor. 04
(c) Product Explain the qualitative distribution for irreversible first order
reactions
12
A
kk
RS ? ? ? ? ? ? in series.
07
*************
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This post was last modified on 20 February 2020