Download GTU BE/B.Tech 2019 Winter 3rd Sem New 2132601 Basic Rubber Science Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019

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Subject Code: 2132601 Date: 30/11/2019
Subject Name: Basic Rubber Science
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What are the differences between density and relative density? 03
(b) How can you obtain relative density of a substance which floats in water? 04
(c) Discuss the conditions which are necessary for rubber like elasticity in polymer. 07

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Q.2 (a) Describe the term ‘Functionality’ with suitable example. 03
(b) Write down the general rules for polymer solubility. 04
(c) Explain in detail about the Bulk Polymerization. 07
OR
(c) Discuss the salient features of solution polymerization technique. 07

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Q.3 (a) Write about the brownian movement exhibited by colloidal solution. 03
(b) Differentiate the multi molecular colloids and macromolecular colloids. 04
(c) Explain the dialysis method for purification of colloidal solution in detail. 07
OR
Q.3 (a) Write in brief about Emulsions. 03

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(b) What do you mean by ‘Tyndall Effect’? Also give its cause. 04
(c) Differentiate the lyophilic sols and lyophobic sols. 07

Q.4 (a) What do you mean by coefficient of friction? List the factors affecting coefficient of friction with respect to rubber? 03
(b) Differentiate the terms ‘vibrations’ and ‘waves’. 04
(c) Explain in detail about refractive index of polymers. 07

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OR
Q.4 (a) Define the terms: (i) Reflection (ii) Refraction (iii) Critical angle 03
(b) Discuss about the effect of fillers and processing oils on transmissibility. 04
(c) Write a short note on Pigment. 07

Q.5 (a) Describe the term ‘thermal conductivity’ with its unit. 03

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(b) Give different modes of heat transfer. 04
(c) Explain in detail about the Fick’s law of diffusion. 07
OR
Q.5 (a) State the Fourier’s law of heat conduction. And represent it mathematically. 03
(b) Write about the terms: absorptivity, reflectivity and transmissivity. 04

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(c) Explain in detail about mass and molar concentrations with ideal gas mixture theory. 07

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