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

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Subject Code: 3152612

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

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1. (a) What do you mean by the term ‘Reclaim Rubber’? [03]
2. (b) How Reclaim Rubber is different than Crum Rubber? Give explanation in brief. [04]
3. (c) Explain major scope of tire recycling in developing countries and give detail applications of Whole tire Reclaim. [07]

Q.2

1. (a) What is essential requirement for reclamation of rubber? explain with example. [03]

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2. (b) What are the disadvantages of reclaimed rubber? [04]
3. (c) Describe in detail about structure and properties of sulfur crosslinks. [07]

Q.3

1. (a) Give different types of reclaim rubber. [03]
2. (b) Describe microwave devulcanization technique. [04]

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

Q.4

1. (a) Explain use of devulcanized rubber in civil applications. [03]
2. (b) Write brief note on “Devulcanisation of Butyl rubber” [04]
3. (c) Discuss in detail about reclaimator process and pan process. [07]

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Q.5

1. (a) What is grafting process? Write about it with suitable example. [03]
2. (b) Write about the cure characteristics of butadiene rubber- whole tire reclaim blend. [04]
3. (c) How can you evaluate quality of reclaim rubber with chemical analysis tests? Discuss in detail. [07]

Q.6

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1. (a) What are the different devulcanising agents used in reclaimation process? [03]
2. (b) Describe about mechanical properties of SBR- whole tire reclaim rubber. [04]
3. (c) How can you control processing behavior of devulcanized rubber? Also write about the key parameters which affects the processing of it. [07]

Q.7

1. (a) What are the advantages of CR/ MA-g- WTR blends? [03]

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2. (b) Write a brief note on Effect of silane coupling agent on SBR/WTR blend. [04]
3. (c) Discuss in detail about Natural rubber- Whole tire Reclaim blend in detail with physical properties. [07]

Q.8

1. (a) List the advantages of NBR/ MA-g- WTR blends. [03]
2. (b) Describe the effect of silane coupling agent on CR-WTR blend. [04]

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3. (c) Explain about NBR/WTR blend in detail with its physical properties. [07]

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