GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Code: 3132304 Date: 30/11/2019
Subject Name: Thermoset Plastics: Materials and Processing Techniques
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: 3132304 Date: 30/11/2019
Subject Name: Thermoset Plastics: Materials and Processing Techniques
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) List the basic characteristics of Thermoset Molding materials. | 03 |
| (b) Define 1) Preforms ii) Bulk factor iii) Preheating | 04 |
| (c) Explain the manufacturing process of MF resin with a neat flow diagram. | 07 |
| Q.2 (a) Explain the preparation of Melamine and Formaldehyde monomers. | 03 |
| (b) Differentiate between Thermoplastics and Thermoset materials. | 04 |
| (c) Explain various preparation techniques of Phenol monomer. | 07 |
| OR | |
| (c) Explain the preparation and curing mechanism of Epoxy resin. | 07 |
| Q.3 (a) Explain briefly about bulk factor of a material. | 03 |
| (b) List the properties and applications of Silicon. | 04 |
| (c) Explain the properties, processing characteristics and applications of UF resin | 07 |
| OR | |
| Q.3 (a) Explain briefly about Breathing in Compression Molding Process. | 03 |
| (b) Draw a neat sketch of the Pot type transfer mold. | 04 |
| (c) Explain the raw material preparation and curing mechanism of UF resin. | 07 |
| Q.4 (a) Explain briefly, the steps in compression molding. | 03 |
| (b) List the properties and applications of PF resin. | 04 |
| (c) Determine the height of powder well for a semi positive landed compression mold for a cylindrical hollow product having outer diameter 20mm and inner diameter 18mm. The height of the product is 14 mm. The bulk factor of the material is 6 and the land width is 5mm. | 07 |
| OR | |
| Q.4 (a) List the advantages of Preforms. | 03 |
| (b) Explain about the importance Preheating and its methods. | 04 |
| (c) List and explain the advantages and disadvantages of Transfer Molding. | 07 |
| Q.5 (a) Explain about Height of Powder well. | 03 |
| (b) List the properties and applications of Epoxy resin. | 04 |
| (c) Write a short note on Positive type compression mold. | 07 |
| Q.5 (a) Differentiate between Novolac and Resols. | 03 |
| (b) Explain the properties and applications of unsaturated polyester resin. | 04 |
| (c) Write a short note on Semi-Positive type compression mold. | 07 |
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