GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2173607 Date: 19/11/2018
Subject Name: Product Design Concept: Structures & Additives
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARK | ||
|---|---|---|
| Q.1 | (a) Draw the structure of following (a) PMMA (b) ABS (c) PTT | 03 |
| (b) Define: (a) PDI (b) Refractive Index (c) Degree of crystallinity | 04 | |
| (c) Explain in detail about any one method of number average molecular weight determination. | 07 | |
| Q.2 | (a) Explain Ostwald viscometer with neat sketch. | 03 |
| (b) Write short note on Cryoscopy. | 04 | |
| (c) Explain Polymer degradation. | 07 | |
| OR | ||
| (c) What are different processing parameters for polymers and rubbers? Describe the effect of temperature on the structure of polymer. | 07 | |
| Q.3 | (a) Write a note on Spherulite structure. | 03 |
| (b) What do you mean by chain flexibility? Explain with example. | 04 | |
| (c) Explain factors affecting glass transition temperature | 07 | |
| OR | ||
| Q.3 | (a) Give three examples of Antioxidants. | 03 |
| (b) Explain plasticizers along with its types and examples. | 04 | |
| (c) Write a short note on role of Additives in the field of polymer and rubber technology. | 07 | |
| Q.4 | (a) Mention different Phases of additives with brief explanation. | 03 |
| (b) List out different types of additives and briefly explain about reinforcing agents: | 04 | |
| (c) Write a detail note on Thermogravimetric Analysis (TGA) | 07 | |
| OR | ||
| Q.4 | (a) Short note: Membrane osmometry. | 03 |
| (b) Explain the effect of molecular weight on the properties of Polyolefins. | 04 | |
| (c) Describes the various method of flexible film testing for food and explain any one of them. | 07 | |
| Q.5 | (a) Explain about permeability testing method. | 03 |
| (b) What do you mean by XRD? | 04 | |
| (c) Enlist different chemical methods for Identification of polymer and give the details of tests perform for LDPE. | 07 | |
| OR | ||
| (a) Describe the SEM which uses electron as a source. | 03 | |
| (b) Write down advantages and disadvantages of SEM and CEM. | 04 | |
| (c) Explain in brief about SEM. | 07 |
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