GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Code: 3132602 Date: 28/11/2019
Subject Name: Rubber Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019Subject Code: 3132602 Date: 28/11/2019
Subject Name: Rubber Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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1. Attempt all questions.2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
| Marks | |
| Q.1 (a) What is the chemical structure of cellulose? Write about the same. | 03 |
| (b) Classify the major groups of protein. | 04 |
| (c) Explain about Humus, Coal and Kerogen as natural polymers. | 07 |
| Q.2 (a) List the processes to produce isoprene. | 03 |
| (b) Which are the different sources of ethylene monomer? | 04 |
| (c) Show the reaction mechanism of Reppe Process for the production of butadiene monomer. | 07 |
| OR | |
| (c) Explain the process to produce Chloroprene from butadiene with the help of reaction mechanism. | 07 |
| Q.3 (a) Relate the orientation and crystallization. | 03 |
| (b) Classify the various ways of stretching to achieve orientation. Describe about any two. | 04 |
| (c) Explain the importance of carbon in polymer chemistry. | 07 |
| OR | |
| Q.3 (a) What is the difference between mono and biaxial orientation? | 03 |
| (b) Compare the effect of orientation on tensile strength and elongation properties. | 04 |
| (c) Summarize the effect of different impurities on properties of polymer. | 07 |
| Q.4 (a) Discuss about the structure of irregular atactic. | 03 |
| (b) What is the role of antioxidants in polymer composition? | 04 |
| (c) Compare the types of polymer degradation. | 07 |
| OR | |
| Q.4 (a) Discuss about the structure of stereoregular isotactic. | 03 |
| (b) List any two examples of antioxidants with their structure. | 04 |
| (c) Explain the reaction mechanism of polymer degradation involving substituent group. | 07 |
| Q.5 (a) What is the difference between adsorption and absorption? | 03 |
| (b) Explain any two methods by which porous structure can be formed in polymers. | 04 |
| (c) Discuss the determinants of polymer crystallinity. | 07 |
| OR | |
| Q.5 (a) Define the terms: (i) Sorption (ii) Sorbent (iii) Sorbate | 03 |
| (b) Explain in brief about the mechanism of sorption of inert sorbates on polymers. | 04 |
| (c) Discuss about the effect of crystallinity on the properties of polymers. | 07 |
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