Download GTU BE/B.Tech 2019 Summer 4th Sem New 2142606 Viscoelasticity Of Elastomers Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142606 Viscoelasticity Of Elastomers Previous Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142606 Date:15/05/2019
Subject Name: Viscoelasticity of Elastomers
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.

Q.1 (a) Derive the equation for the entropy generated force in polymer chain. 03
(b) Give the difference between Viscosity and Apparent Viscosity. 04
(c) Explain in detail about the Bulk modulus with Suitable Example. 07

Q.2 (a) Write about the Deborah number. 03
(b) Give the difference between Dynamic viscosity and Kinematic viscosity 04
(c) Explain the Capillary viscometer in detail. 07
OR
(c) Explain the ?Theory of Viscosity?. 07
Q.3 (a) List the molecular requirements of Elastomers. 03
(b) Give the comparison of Time dependent & Time independent non Newtonian
fluid.
04
(c) Discuss in detail about the ?Viscoplastic fluids.? 07
OR
Q.3 (a) What is the difference between Pseudoplastic and Dilatant fluid? 03
(b) List out the classification of fluids and explain any one in brief. 04
(c) Explain in detail about the Thixotropic and Rheopectic fluids in detail. 07
Q.4 (a) Give the advantages of Voight Model. 03
(b) Write a brief not on Superposition Principles. 04
(c) Discuss the Four parameter model in detail. 07
OR
Q.4 (a) Derive the creep experiment equation for Maxwell model. 03
(b) Give the difference between Stress Relaxation and Retardation. 04
(c) A bar of polypropylene is of length 200 mm and has a rectangular cross section
of diameters 25 mm X 3 mm. It is subjected to a constant tensile load of 250 N
acting along its length. 100 s after the load was applied the length is measured and
is found to have increased by 0.5 mm. Determine the 100 s tensile creep
compliance.
07
Q.5 (a) Write about the Creep Compliance and Relaxation Modulus. 03
(b) ?Bulky Side group affects the Glass transition temperature? justify the statement. 04
(c) Describe the transitions and associated properties with respect to glass transition
temperature.
07
P.T.O
OR
Q.5 (a) How the elastic fluids responses under creep test? 03
(b) Write the observation from the phase states of substance and their comparison
with the states of aggregates.
04
(c) List out the different factors affecting glass transition temperature explain any two
in detail.
07
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