Name of the University : Mahatma Gandhi University
Department : Polymer Engineering
Degree : B.Tech
Subject Code/Name : PO 010 506/Rubbers- Science & Technology
Sem : V
Website : mgu.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/mgu.ac.in/5371-PO502.doc
Rubbers- Science & Technology Model Question Paper :
Mahatma Gandhi University :
V Semester B. Tech. Degree Examination :
Branch: Polymer Engineering
PO 010 506 Rubbers- Science & Technology :
Time: 3 hours
Maximum: 100 Marks
Related : Mahatma Gandhi University Plastics Science & Technology B.Tech Model Question Paper : www.pdfquestion.in/5369.html
Part A :
Answer all questions :
Each question carries 3 marks :
1. Natural rubber shows high gum vulcanisate strength and high green strength. Why?
2. What is vulcanization? Mention the physical and chemical changes accompanying vulcanization.
3. Based on the structure, explain the high air impermeability of butyl rubber.
4. Which rubber is suited for making oil seals? How the oil resistance varies with its composition?
5. Why block copolymer TPEs show the properties of reinforced vulcanized elastomer? (5×3=15)
Part B :
Answer all questions :
Each question carries 5 marks :
6. Write short note on preparation and advantages of powdered rubber.
7. Explain the mechanism of sulphur vulcanization
8. What are the monomers of SBR? Mention any one method for their preparation.
9. What is the significance of dienes in ethylene propylene rubber? What are the requirements of dienes? Give two examples.
10. Write notes on nitrosofluoro elastomers. (5×5=25)
Part C :
Answer all questions :
Each question carries 12 marks :
11(a). What are technically specified grades of NR? What are the technical specifications? Explain the production of crumb rubber. (2+3+7)
OR
(b). Write notes on (i) SP rubber (ii). DPNR (iii). Liquid NR
12(a). Explain the various continuous vulcanization techniques
OR
(b). Write notes on (i) different sulphur vulcanization systems (ii) vulcanization by microwave and radiation
13(a). Write in detail the monomer preparation and polymerization process for the manufacture of polybutadiene.
OR
(b) Write notes on (i) halogenation of butyl rubber (ii) compare and contrast the properties of NR and IR
14(a) Write an essay on the monomer preparation, polymerization and properties and applications of chloroprene rubber
OR
(b) Write the structure, properties and vulcanizing agent for the following rubbers: (i) NBR (ii) silicone rubber (iii) EP rubber
15(a). Write the structure, properties and applications of (i) chlorosulphonated polymer (ii) acrylic rubber (iii) polysulphide rubber
OR
(b) Write notes on (i) fluorine containing rubbers (ii) TPEs
Biomedical And Biopolymers :
Part A : (Answer all questions)
Time: 3hours Max Marks:100
1. Define biomaterials.
2. Give note on polymeric blood.
3. Give note on hydrogels.
4. Give note on crown and bridge resins.
5. Give the structure of DNA. (5X3=15)
Part B : (Answer all questions)
6. Explain different sterilisation methods.
7. Explain blood clotting system.
8. Explain Polymeric Skins
9. Briefly explain materials used in soft contacts lenses.
10. How viscose rayon is prepared?. (5X5=25)
Part C : (Answer either a or b)
11(a) Explain inflammation and wound healing.
Or
11(b) Explain different biomaterials and their applications.
12(a) Explain biomedical application of polymers.
Or
12(b) Explain polymers in cardiovascular application.
13(a) Briefly explain different type of contact lens.
Or
13(b) Give note on Polymers used in opthalmology.
14(a) Explain dental prosthetic materials.
Or
14(b) Give different classification of Dental Bases materials.
15(a) Explain the synthesis of proteins.
Or
15(b)Explain the structure of Polysaccharides. (5X12=60)
Latex Technology :
Part A : Answer all questions
1. Define NR Latex.
2. What is MST?
3. Give one examples of dispersing and emulsifying agents.
4. Name some heat sensiting agents used in latex industry.
5. Give note on use of latex in road rubberisation. ( 5X3=15)
Part B : Answer all questions
6. Explain Natural coagulation in NR latex.
7. Give general composition of NR latex.
8. Differentiate VFA No. and KOH No.
9. Give important surface active agents used in latex compounding.
10. Explain different gelling systems. (5X5=25)
Part C : Answer all questions
11. Explain latex preservation systems.
Or
12. Explain preparation of SBR latex.
13. Explain latex concentration by centrifuging.
Or
14. Explain latex concentration by creaming.
15. Explain different equipments used for the preparation of dispersions.
Or
16. Explain different compounding ingredients used in the latex industry.
17. Explain different dipping methods.
Or
18. Give suitable formulation for the manufacturing of Surgen’s glove. Justify the answer. Outline manufacturing of gloves.
19. Explain Dunlop process for latex foam production.
Or
20. Explain Talalay process for latex foam production 5X12=60