Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2162304 Polymer Reaction Engineering And Rheology Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2162304 Date:30/11/2018
Subject Name:Polymer reaction engineering and Rheology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Give difference between elementary and nonelementary
reactions.
03
(b) Discuss working of Batch reactor. Give its advantages and
limitations.
04
(c)
Define: Rheology. Classify non-Newtonian fluids and give
time-dependent fluids, time independent fluids with suitable
examples.
07
Q.2 (a) Explain die swell and melt fracture effect in polymer melt
flow.
03
(b) Explain Voigt model for viscoelasticity. 04
(c) Discuss working of Torque rheometer with diagram. 07
OR
(c) Classify chemical reactions and explain with suitable
examples.
07
Q.3 (a) Polymer has a glass transition temperature of 0 ?C, at
50 ?C; it has a melt viscosity of 2.69 x10
4
poises (P). What
will its viscosity be at 70 ?C?
03
(b) Discuss WLF equation. 04
(c)
Explain kinetics studies of Free radical polymerization.
07
OR
Q.3 (a) Explain Maxwell model for viscoelastic materials. 03
(b) Explain flow analysis using Power law. 04
(c) Discuss: Free volume Theory 07
Q.4 (a) Explain working of Continuous stirred tank reactor
(CSTR) along with its advantages.
03
(b) Explain the creep curve for plastic materials. 04
(c) Explain temperature dependency from Arrhenius law. 07
OR
Q.4 (a) The following are data for polymerisation of styrene in
benzene at 60?C with benzoyl peroxide as the initiator. If
the spontaneous decomposition rate of benzoyl peroxide is
3.2 x 10
-6
m
3
/mol sec
-1
. Calculate of rate of propagation for
free radical polymerisation. [M]=3.34 x10
3
mol/m
3
, [I] =
4.0 mol/m
3
, f =1, kp
2
/ kt = 0.95 x 10
-6
m
3
/mol sec.
03
(b) How molecular weight and molecular weight distribution
affect polymer viscosity? Discuss.
04
(c) What is Weissenberg effect? Discuss. 07
Q.5 (a) The rate constants of a certain reaction are 1.6 x10
-3
&
1.625x10
-2
(s)
-1
at 10?C & 30?C. Calculate the activation
energy.
03
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2162304 Date:30/11/2018
Subject Name:Polymer reaction engineering and Rheology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Give difference between elementary and nonelementary
reactions.
03
(b) Discuss working of Batch reactor. Give its advantages and
limitations.
04
(c)
Define: Rheology. Classify non-Newtonian fluids and give
time-dependent fluids, time independent fluids with suitable
examples.
07
Q.2 (a) Explain die swell and melt fracture effect in polymer melt
flow.
03
(b) Explain Voigt model for viscoelasticity. 04
(c) Discuss working of Torque rheometer with diagram. 07
OR
(c) Classify chemical reactions and explain with suitable
examples.
07
Q.3 (a) Polymer has a glass transition temperature of 0 ?C, at
50 ?C; it has a melt viscosity of 2.69 x10
4
poises (P). What
will its viscosity be at 70 ?C?
03
(b) Discuss WLF equation. 04
(c)
Explain kinetics studies of Free radical polymerization.
07
OR
Q.3 (a) Explain Maxwell model for viscoelastic materials. 03
(b) Explain flow analysis using Power law. 04
(c) Discuss: Free volume Theory 07
Q.4 (a) Explain working of Continuous stirred tank reactor
(CSTR) along with its advantages.
03
(b) Explain the creep curve for plastic materials. 04
(c) Explain temperature dependency from Arrhenius law. 07
OR
Q.4 (a) The following are data for polymerisation of styrene in
benzene at 60?C with benzoyl peroxide as the initiator. If
the spontaneous decomposition rate of benzoyl peroxide is
3.2 x 10
-6
m
3
/mol sec
-1
. Calculate of rate of propagation for
free radical polymerisation. [M]=3.34 x10
3
mol/m
3
, [I] =
4.0 mol/m
3
, f =1, kp
2
/ kt = 0.95 x 10
-6
m
3
/mol sec.
03
(b) How molecular weight and molecular weight distribution
affect polymer viscosity? Discuss.
04
(c) What is Weissenberg effect? Discuss. 07
Q.5 (a) The rate constants of a certain reaction are 1.6 x10
-3
&
1.625x10
-2
(s)
-1
at 10?C & 30?C. Calculate the activation
energy.
03
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2
(b) Discuss: (i) Effect of Temperature on Polymer Viscosity
(ii) Effect of Shear Rate on Viscosity.
04
(c) With neat diagram explain Cone and plate viscometer for
polymer melt.
07
OR
Q.5 (a)
What are the advantages and limitations of Semi batch reactor?
03
(b)
Explain kinetics studies of Cationic polymerization.
04
(c) Write a note on: Boltzman superposition principle. 07
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This post was last modified on 20 February 2020