Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2172609 Rubber Recycling And Waste Management Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2172609 Date:28/01/2021
Subject Name:Rubber Recycling & Waste Management
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Give the variables which affect the properties of sintered products.
03
(b) List the disadvantages of the ambient process for the production of crumb rubber.
04
(c) Explain in detail about Cryogenic process for the production of crumb rubber.
07
Q.2 (a) How can you modify ground rubber by the reactive gas treatment?
03
(b) Give a brief note on modification of ground rubber by interfacial
04
compatibilisation.
(c) Discuss in detail about use of ground rubber in virgin rubber compound.
07
Q.3 (a) Define the role of Reclaiming agents and catalysts in reclaiming process.
03
(b) How the covalent bond energies play a role in sulfur crosslinks scission?
04
(c) Discuss in detail about the mechanism of reclaiming reaction.
07
Q.4 (a) Show the reaction mechanism of the opening of sulfur crosslinks by nucleophilic
03
reagents.
(b) Write in brief about microbiological devulcanisation technique.
04
(c) Explain in detail about the De-Link process.
07
Q.5 (a) What is Rezofan? How crumb rubber is utilized for this application?
03
(b) Write about the employment of ground rubber for improvement of soil properties.
04
(c) Mention the basic ways for use of crumb rubber in road pavement construction.
07
Discuss about any one.
Q.6 (a) Write about the scrap tyre management in production of Flexible fixing structures. 03
(b) Give the function of cationites. Write about its synthesis from rubber flour.
04
(c) Discuss the importance of crushed vulcanizates in production of various building
07
materials.
Q.7 (a) Express the relation between Pyrolysis temperature and vapor residence time
03
during Tyre Pyrolysis.
(b) Draw the diagram for Fluidized bed Pyrolysis reactor and write its working
04
mechanism in brief.
(c) Show the process flow chart for Co-separation process of Tyre Pyrolysis by using
07
single reactor scheme and write its advantage also.
Q.8 (a) Write in brief about Oxidative process of Tyre Pyrolysis.
03
(b) Mention the advantage of Travelling grate Pyrolysis reactor and draw its
04
schematic diagram.
(c) Draw the basic flow chart showing pyrolytic reprocessing of scrap tyres into
07
marketable products and explain it in detail.
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This post was last modified on 04 March 2021