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2003 Course Rubber Technology (Elective)

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Total No. of Questions : 12] P1524 [Total No. of Pages : 3 [3764]-356 B.E. (Polymer) RUBBER TECHNOLOGY (2003 Course) (Backlog) (Elective) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Explain the various stages in the raw rubber technology. [8] What are the molecular - structure requirements for a material to act as a rubber? [8] OR Explain the thermodynamic theory for rubber elasticity. [8] Define the following terms: i) Scorch. ii) Mastication. iii) Reversion. iv) Vulcanisation. [8] Q3) a) List the various types of C-blocks and differentiate between them. [8] b) Explain the need for addition, mechanism of functioning and two examples of each of the following additives w.r.t. rubbers. [10] i) Peptizers. ii) Tackifiers. iii) Antiozonants. OR P.T.O. 1 Q4) a) Explain the properties of C-block w.r.t. structure, particle porosity, physical nature of the surface, chemical nature of the surface and surface area. [10] b) What is the need for addition of vulcanising agents? State the different types of vulcanising agents with examples. Also explain the need and mechanism of functioning of activators and accelerators with two examples of each. [8] Q5) a) What is vulcanisation? State the factors which affect the rate of vulcanisation. [8] b) List the ingredients in a typical vulcanisation mix, identify each one as to purpose, chemical type or structure and approximate amount used.[8] OR Draw and explain the rheometer cure curve. Explain its significance.[8] What is mastication? State its significance. Discuss the mastication curve for Natural rubber. [8] Q6) a) b) SECTION - II Q7) a) List the different types of roll arrangements used in calendaring. Explain roll chambering. [8] b) What is "roll bending" in calendaring process? What are the remedies to overcome the same? [8] OR Discuss the process of injection molding of rubbers. [8] Q8) a) b) List the different types of extrusion techniques used for rubbers. Explain any one method with a neat sketch. [8] Q9) a) Define "cellular rubber". What are the three main classes of cellular rubber? Differentiate between them. List a few tests carried out on rubber foams. [8] b) List the basic types of tyre constructions. Differentiate between Diagonal ply tyre construction and radial ply tyre construction. What are the advantages of radial ply tyres? [10] OR Discuss the rubber hose w.r.t. the following points. [8] i) Construction. ii) Materials used and iii) Manufacture of a moulded hose. Q10)a) [3764]-356 2 -2- b) Explain the process for manufacture of rubber conveyor belts. State the applications of rubber conveyor belts. Explain the material requirement in conveyor belts w.r.t. textile reinforcement and types of rubber used. Give a typical formulation used for the carcass compound. [10] Q11)a) Define the term "resilience" and explain the test used to measure rebound resilience. [6] b) Define "permanent set" and explain the method used to determine [4] permanent set intension. c) Define volume and surface resistivity. Explain briefly with neat diagrams the methods to measure them. [6] OR Which tests would be carried out for the following products. Why?[8] i) Engine mountings. ii) Seals and Gaskets. iii) Tyres. iv) Diaphragms for values and pumps. Q12)a) b) Define "fatigue". What are the factors affecting fatigue - cracking? Explain the test to determine fatigue property in rubbers. [8] [3764]-356 3 -3-

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