Download GTU BE/B.Tech 2018 Winter 5th Sem New 2153606 Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2153606 Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2153606 Date:04/12/2018

Subject Name:Polymer & Rubber Material-II

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.

MARKS

Q.1 (a) Draw The Structure of Epoxy, MF, UF 03
(b) Name the polymer with structure for following applications and give
reason for choice: mold release agent & mattress
04
(c) Explain in detail synthesis and applications of Amino resin. 07

Q.2 (a) Write a Application of Epoxy Resin in Coating Industry. 03
(b) Describe the Application & Properties of Novolac Resin 04
(c) Explain the reaction mechanism between phenol and formaldehyde and
process of forming PF resins
07
OR
(c) Why curing is important in case of thermosets? Discuss briefly the
mechanism of curing of epoxy system with various curing agents
07
Q.3 (a) Compare sulfur vulcanization vs peroxide vulcanization. 03
(b) Write an explanatory note on epoxy-novalac & epoxy-acrylate system. 04
(c) Explain in short the vulcanization of rubber and also the cross linking
technology.
07
OR
Q.3 (a) Give the Name of Modified alkyds 03
(b) Write Application of UF & MF 04
(c) Thermoset polymers are very useful in the coating application. Name a
thermoset polymer used for this purpose in washing machine application.
Justify and describe the synthesis and properties of the polymer
07
Q.4 (a) Define i) Acid Value ii) Iodine Value iii) Epoxy Equivalent Weight 03
(b) Write an explanatory note on epoxy-novalac & epoxy-acrylate system. 04
(c) Describe the synthesis; curing and applications of polyurethane resins 07
OR
Q.4 (a) Write unique properties polyurethane resins. 03
(b) Explain silicones rubber? Mention its important application 04
(c) Illustrate with example vulcanization & de-vulcanization of rubbers.


07
Q.5 (a) What is fiber reinforced polyester? 03
(b) Justify: Why Thermosetting Polymers are Amorphous? 04
(c)
Explain the reaction mechanism between phenol and formaldehyde and process
of forming PF resins?
07
OR

Q.5 (a) Explain CNSL Resin 03
(b) Write application & Properties of Kevlar Fiber 04
(c) Write a short note on alkyd resin. Explain with types. 07
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