Download GTU B.Tech 2020 Winter 5th Sem 3152612 Reclaimed Rubber And Its Technology Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152612 Reclaimed Rubber And Its Technology Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152612 Date:22/01/2021
Subject Name:Reclaimed Rubber & its Technology
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) What do you mean by the term `Reclaim Rubber'?
03

(b) How Reclaim Rubber is different than Crum Rubber? Give explanation
04
in brief.

(c) Explain major scope of tire recycling in developing countries and give
07
detail applications of Whole tire Reclaim.
Q.2 (a) What is essential requirement for reclamation of rubber? explain with
03
example.

(b) What are the disadvantages of reclaimed rubber?
04

(c) Describe in detail about structure and properties of sulfur crosslinks.
07
Q.3 (a) Give different types of reclaim rubber.
03

(b) Describe microwave devulcanization technique.
04

(c) Explain in detail about digester process and thermal process.
07




Q.4 (a) Explain use of devulcanized rubber in civil applications.
03

(b) Write brief note on "Devulcanisation of Butyl rubber"
04

(c) Discuss in detail about reclaimator process and pan process.
07
Q.5 (a) What is grafting process? Write about it with suitable example.
03

(b) Write about the cure characteristics of butadiene rubber- whole tire
04
reclaim blend.

(c) How can you evaluate quality of reclaim rubber with chemical analysis
07
tests? Discuss in detail.



Q.6 (a) What are the different devulcanising agents used in reclaimation
03
process?

(b) Describe about mechanical properties of SBR- whole tire reclaim
04
rubber.

(c) How can you control processing behavior of devulcanized rubber?
07
Also write about the key parameters which affects the processing of it.
Q.7 (a) What are the advantages of CR/ MA-g- WTR blends?
03

(b) Write a brief note on Effect of silane coupling agent on SBR/WTR
04
blend.




(c) Discuss in detail about Natural rubber- Whole tire Reclaim blend in
07
detail with physical properties.



Q.8 (a) List the advantages of NBR/ MA-g- WTR blends.
03
(b) Describe the effect of silane coupling agent on CR-WTR blend.
04
(c) Explain about NBR/WTR blend in detail with its physical properties.
07

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