Download GTU BE/B.Tech 2019 Summer 4th Sem New 2142602 Natural Rubber Science And Technology Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142602 Natural Rubber Science And Technology Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142602 Date:20/05/2019
Subject Name: Natural Rubber Science & Technology
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.


Q.1 (a) Write in brief about SMR L. 03
(b) Give the advantages of TSR over conventional grades. 04
(c) Discuss in detail about ?Ribbed Smoke Sheets? and ?Brown and
Blanket Crepes? in detail.
07
Q.2 (a) Compare the network structure of conventional and liquid elastomers. 03
(b) What is the alternative method for achieving carbon black dispersion
in liquid polybutadiene rubber?
04
(c) Give the methods for preparation of Powdered rubbers. Explain any
two in detail.
07
OR
(c) Discuss about the advantages of Powdered and Particulate rubbers. 07
Q.3 (a) List the stages of development of reactive prepolymer for NR graft
copolymers.
03
(b) Write in brief about graft copolymers as thermoplastic rubbers. 04
(c) Discuss about the effect of compounding on the diffusion of
hydrocarbon liquids and oils.
07
OR
Q.3 (a) What is the relation between tensile strength and grafting efficiency
for polystyrene graft copolymer with NR and IR respectively?
03
(b) Give the reaction mechanism for grafting chemistry. 04
(c) Write a short note on Wax Blooming. 07
Q.4 (a) What do you mean by flexible rubber-steel laminates? 03
(b) How the Puncture test is carried out? Explain with suitable diagram. 04
(c) Describe the types of depolymerized rubber according to the degree of
degradation achieved.
07
OR
Q.4 (a) Define the Term: ?Hysteresis Loss?. Write its practical significance. 03
(b) Give a brief note on ?Creep and Stress relaxation?. 04
(c) Explain the chemistry of epoxidation with reaction mechanism. 07
Q.5 (a) Write about any two types of Reclaimed rubber. 03
(b) Describe the ?Induction period? in low temperature crystallization
process.
04
(c) Write a short note on ?Rubberized Asphalt?. 07
OR

Q.5 (a) List the major uses of Reclaimed rubber. 03
(b) Draw the Compression test-piece geometry for measurement of elastic
modulus during crystallization process and write about it.
04
(c) Write a short note on Reclaimator process. 07

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