GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Name:Additives and Compounding of Plastics
Time:02:30 PM TO 05:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION — SUMMER 2019
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Subject Code:2172303/2172312 Date:14/05/2019Subject Name:Additives and Compounding of Plastics
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | |
| Q.1 (a) Define Additives. List the additives use for plastics. | 03 |
| (b) Compare: Additives and Compounding | 04 |
| (c) Give detailed classification of Additives. | 07 |
| Q.2 (a) Define compounding. Which are the reasons for compounding? | 03 |
| (b) Define flame retardants? Explain the mechanism of functioning of flame retardants. | 04 |
| (c) Discuss in detail the construction and working of ribbon blender with a neat diagram. | 07 |
| OR | |
| (c) Define fillers. Give classification and function of fillers in detail. | 07 |
| Q.3 (a) Define Chemical and Physical Blowing agents | 03 |
| (b) Define plasticizers. List the function of plasticizers. | 04 |
| (c) List the technological requirements of additives | 07 |
| OR | |
| Q.3 (a) Define Impact modifiers. State the function and examples of impact modifiers. | 03 |
| (b) Explain anti-slip additives with examples. | 04 |
| (c) Explain the construction and working of a high speed mixture with a neat diagram. | 07 |
| Q.4 (a) Define nucleating agent? Give examples of it. | 03 |
| (b) Compare: Dyes and Pigments | 04 |
| (c) Define Anti-oxidants. Explain about it in detail | 07 |
| OR | |
| Q.4 (a) Write note on conductive fillers | 03 |
| (b) Write a short note on theory of mixing | 04 |
| (c) Define Heat stabilizer. Explain role of stabilizer in plastic in detail. | 07 |
| Q.5 (a) List the limitations of mixing theory | 03 |
| (b) Short note on Anti blocking agent. | 04 |
| (c) Explain the construction and working of banbury mixer with a neat sketch. | 07 |
| OR | |
| Q.5 (a) Explain continuous and batch type mixing process | 03 |
| (b) Explain the purpose of a mold release agent | 04 |
| (c) Explain the construction and working of a two roll mill. | 07 |
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