Download GTU BE/B.Tech 2019 Summer 5th Sem New 2152303 Plastics Recycling And Waste Treatment Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2152303 Plastics Recycling And Waste Treatment Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2152303 Date: 31/05/2019

Subject Name: Plastics Recycling & Waste Treatment

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define: Primary recycling, Secondary recycling and Tertiary
recycling.
03
(b) Explain density separation (Float/sink) with flow diagram. 04
(c) Discuss secondary recycling by co-extrusion and co-injection
molding for production of sandwich structure.
07

Q.2 (a) Which are the sources of Plastics waste? Discuss. 03
(b) List various size reduction techniques and explain any one. 04
(c) Explain PET Glycolysis process with neat flow diagram. 07
OR
(c) Discuss cryogenic grinding method for granulating difficult
materials.
07
Q.3 (a) Define: Pyrolysis. Give advantages of Pyrolysis. 03
(b) Discuss various separation methods used for plastics waste. 04
(c) Explain with suitable example, degradation mechanisms of
thermoplastics due to repetitive processing.
07
OR
Q.3 (a) Explain recycling of PU using hydrolysis process. 03
(b) With neat flow diagram explain solvent separation process. 04
(c) Write a note on: Plastics in Landfill. 07
Q.4 (a) Which are the 3 R?s of waste management? Discuss. 03
(b) Draw flow diagrams for (i) Conversion of HDPE/PP woven
sacks (ii) HDPE containers waste to molded Products.
04
(c) Discuss In-line automatic recycling systems with neat
diagram.
07
OR
Q.4 (a) What are biodegradable plastics? How they are helpful in
plastic waste management.
03
(b) Discuss various problems associated with the incineration of
plastics.
04
(c) Write a note on: Medical plastics waste management. 07
Q.5 (a) Discuss the use of plastics waste as fillers. 03
(b) Explain about Rotory kiln and Fluidized bed Pyrolysis
Reactor with schematic diagram.
04
(c) Give plastics identification codes for recycling with their
properties and applications.
07
OR

Q.5 (a) How Plastic waste is used in Road construction? Discuss. 03
(b) Discuss various technical approaches to secondary recycling. 04
(c) With neat diagram explain various types of granulators and
knifes used for recycling.
07
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