Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2150403 Basics Of Reaction Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150403 Date: 04/12/2019
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.
4. Notations and symbols have their conventional meanings.
Q.1 (a) Explain different types of ideal reactors. 03
(b) What do you understand by instantaneous fractional yield and overall
fraction yield of a product?
04
(c) Explain the Arrhenius theory of temperature dependency. Explain with the
help of a graph that how activation energy affects temperature sensitivity
of reaction.
07
Q.2 (a) Define the following terms:
i) Rate constant ii) Molecularity iii) Order of reaction
03
(b) Show that for a second order irreversible reaction 2A ? products,
A
Ao A
X 1
C 1-X
= kt.
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
(c) The rate constant of a reaction is measured at different temperatures is
reported below. Calculate the activation energy for this reaction.
Temperature, K 278 298 308 318
Rate constant, k,
sec
-1
2.16 x 10
5
42.2 x 10
5
516 x 10
5
4520 x 10
5
07
Q.3 (a) Explain the classification of reaction in details with examples. 03
(b) Find the first order rate constant for the disappearance of A in the gas
phase reaction 2A?R, if on holding the pressure constant, the volume of
the reaction mixture starting with 80 % of A decreases by 20% in 3
minutes.
04
(c) Explain the kinetic models for non-elementary reactions with examples. 07
OR
Q.3 (a) Explain the significance of space time and space velocity. 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) Explain the kinetics of reactions of shifting order. 07
Q.4 (a) How mixing of different composition of fluid is the key to the formation
of intermediate for irreversible reactions in series?
03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150403 Date: 04/12/2019
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.
4. Notations and symbols have their conventional meanings.
Q.1 (a) Explain different types of ideal reactors. 03
(b) What do you understand by instantaneous fractional yield and overall
fraction yield of a product?
04
(c) Explain the Arrhenius theory of temperature dependency. Explain with the
help of a graph that how activation energy affects temperature sensitivity
of reaction.
07
Q.2 (a) Define the following terms:
i) Rate constant ii) Molecularity iii) Order of reaction
03
(b) Show that for a second order irreversible reaction 2A ? products,
A
Ao A
X 1
C 1-X
= kt.
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
(c) The rate constant of a reaction is measured at different temperatures is
reported below. Calculate the activation energy for this reaction.
Temperature, K 278 298 308 318
Rate constant, k,
sec
-1
2.16 x 10
5
42.2 x 10
5
516 x 10
5
4520 x 10
5
07
Q.3 (a) Explain the classification of reaction in details with examples. 03
(b) Find the first order rate constant for the disappearance of A in the gas
phase reaction 2A?R, if on holding the pressure constant, the volume of
the reaction mixture starting with 80 % of A decreases by 20% in 3
minutes.
04
(c) Explain the kinetic models for non-elementary reactions with examples. 07
OR
Q.3 (a) Explain the significance of space time and space velocity. 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) Explain the kinetics of reactions of shifting order. 07
Q.4 (a) How mixing of different composition of fluid is the key to the formation
of intermediate for irreversible reactions in series?
03
2
(b) Find the conversion after 1 hour in a batch reactor for A?R,
-r A = 3CA
0.5
mol
0.5
/lit
0.5
.hr, C Ao = 1 mol/lit.
04
(c) Derive the CRmax and tRmax for the first order reactions given below:
A ? R ? S
07
OR
Q.4 (a) Explain the size comparison of single ideal CSTR with PFR. 03
(b) Derive the design equation of recycle reactor. 04
(c) Write a short note on differential method and integral method of analysis
of data.
07
Q.5 (a) Derive the performance equation of ideal batch reactor. 03
(b) Write a short note on optimum temperature progression. 04
(c) A first order irreversible reaction A ? B is carried out in a plug flow
reactor followed by an equal size CSTR in series. The concentration of A
in the feed is 1 kmol/m
3
and the residence time in each reactor is 3600 sec.
The specific reaction rate constant for the reaction is 1/3600 sec
-1
. Find the
conversion of A at the exit of the system.
07
OR
Q.5 (a) Derive the performance equation of ideal plug flow reactor (PFR). 03
(b) Discuss the different ways in which rate of reaction can be defined. 04
(c) Discuss in detail the qualitative product distribution for series reactions. 07
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This post was last modified on 20 February 2020