Download GTU B.Tech 2020 Winter 5th Sem 3152601 Vulcanization Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152601 Vulcanization Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152601 Date:27/01/2021
Subject Name:Vulcanization
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1
(a)
Why selenium is not used as a vulcanizing agent though it takes
03
same place along with sulphur in periodic table?

(b)
Distinguish vulcanized rubber and unvulcanized rubber
04

(c)
Explain the construction and working of Oscillating Disc
07


rhe
R omnete
heomete r
r(ODR) with labeled diagram.
Q.2
(a)
List the major components of structure of rubber vulcanizate.
03

(b)
Construct the labeled diagram showing different types of crosslinks
04
are formed during the sulphur vulcanization

(c)
Explain the vulcanization of thick rubber article.
07
Q.3
(a)
List any two examples of sulphur donors with their structure.
03

(b)
Illustrate sulphur vulcanization crosslinking network structure with
04
suitable diagram.

(c)
Write a short note on Sulphenamide accelerator.
07




Q.4
(a)
List out any two examples of peroxides with carboxyl group with
03
their structure.

(b)
Illustrate post vulcanization reaction network reaction with suitable
04
diagram.

(c)
Write a short note on Dithiocarbamate accelerator.
07
Q.5
(a)
List out the different phases observed during free heating.
03

(b)
Compare the saturated steam vulcanization and superheated steam
04
vulcanization.

(c)
Explain the chemical method and physical method respectively to
07
assess the state of cure.



Q.6
(a)
How vulcanization is carried out in jacketed autoclave?
03

(b)
Compare different continuous vulcanization line on the basis of their
04
key features.

(c)
Explain the limitations of vulcanization temperature.
07
Q.7
(a)
Summarize the principle of electone beam vulcanization technique.
03

(b)
How vulcanization is carried out through rotocure?
04

(c)
Explain the vulcanization in water.
07
Q.8
(a)
Summarize the principle of microwave curing.
03
(b)
What are advantages and disadvantages of Liquid Curing Method
04
(LCM)?
(c)
Explain the fluid bed vulcanization.
07

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