GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Plastics Recycling & Waste Treatment
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
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Subject Code: 2152303 Date: 04/12/2019Subject Name: Plastics Recycling & Waste Treatment
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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| Q.1 (a) Define 1) Primary Recycling ii) Nuisance Plastics iii) Tertiary Recycling | 03 |
| (b) Write the Recycling codes for i) HDPE ii) PVC iii) PET iv) PP | 04 |
| (c) With a neat flow diagram, explain the flow of plastic products and plastic waste. | 07 |
| Q.2 (a) List and explain the sources of plastic waste. | 03 |
| (b) Explain about use of plastic waste as fillers in secondary recycling. | 04 |
| (c) Write a short note on the sink-float separation method for separating mixtures of plastics. | 07 |
| OR | |
| (c) Explain about granulators used in primary recycling of plastics. | 07 |
| Q.3 (a) Explain the waste management of plastics with four R’s. | 03 |
| (b) Discuss with a neat flow diagram the inline automatic recycling system for primary recycling of waste plastics. | 04 |
| (c) List the methods of separating paper/plastic mixture and explain any one. | 07 |
| OR | |
| Q.3 (a) Explain the properties used/as a basis of separation for separating plastic, wood, paper, glass & metallic waste. | 03 |
| (b) List the problems encountered in incineration of pure plastic waste. | 04 |
| (c) With a neat sketch, explain the Union Carbide’s cryogenic grinding system used to granulate granulating difficult materials. | 07 |
| Q.4 (a) Discuss the technical problems encountered in primary recycling of plastics. | 03 |
| (b) Explain the types of pyrolysis system used for pyrolysing municipal solid waste. | 04 |
| (c) How is co-extrusion & co-injection technique helpful in the secondary recycling of plastics. | 07 |
| OR | |
| Q.4 (a) Write a short note on PVS scrap recycling. | 03 |
| (b) What is Landfill? Explain the Sanitary Land filling in brief. | 04 |
| (c) Define pyrolysis. List advantages of Pyrolysis. Write the principal reactions involved in pyrolysis process. | 07 |
| Q.5 (a) List the technical problems encountered in pyrolysis of plastics. | 03 |
| (b) Explain the recycling of PET by chemical decomposition techniques through tertiary recycling. | 04 |
| Q.5 (a) Explain the recycling of HDPE containers with a flow diagram. | 03 |
| (b) Draw only the flow diagram to separate plastic from plastic coated | 04 |
| (c) Write a short note on Environmental Implications for recycling of plastics. | 07 |
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