GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION - WINTER 2018
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Subject Code:2132601 Date:01/12/2018
Subject Name:Basic Rubber Science
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) What do you mean by R-class rubber? Give its two examples with their 03 structures.
(b) Write down the general rules for polymer solubility. 04
(c) Discuss the conditions which are necessary for rubber like elasticity in 07 polymers.
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Q.2 (a) Give the classification of polymer based on its structure with suitable 03 examples.
(b) Differentiate the chain growth polymerization and step growth 04 polymerization.
(c) Discuss in detail about the propagation step with respect to free radical 07 polymerization.
OR
(c) Write a short note on emulsion polymerization technique. 07
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Q.3 (a) How you differentiate the terms ‘density’ and ‘relative density’? 03
(b) Define the term ‘friction’. Give the classification and effects associated 04 with it.
(c) Discuss about the characteristics features-of sinusoidal vibrations. 07
OR
Q.3 (a) State the laws of floatation. 03
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(b) What do you mean by shape factor? Show the steps to measure shape 04 factor for rectangular block.
(c) Discuss in detail about the effect of compounding in transmissibility. 07
Q.4 (a) State the Fourier’s law -of heat conduction with its mathematical 03 expression.
(b) What is the meaning of ‘Convection’? Write about the classification of 04 it.
(c) Write about-the different modes of mass transfer. And write the 07 different applications involving it.
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OR
Q.4 (a) Write about ‘Thermal conductivity’ with its unit. 03
(b) Discuss in brief about absorptivity, reflectivity and transmissivity. 04
(c) Derive the equations for mass and molar concentrations with ideal gas 07 mixture theory.
Q.5 (a) Write about the Tyndall effect exhibited by colloidal solution. 03
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(b) Give any four differences between True solutions and Colloidal 04 solutions.
(c) Write a short note on Pigment. 07
OR
Q.5 (a) Draw the diagram of a dialysis cell used for the purification of colloidal 03 solution.
(b) What do you mean by Gel? Give importance of it. 04
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(c) Explain in detail about Refractive index of polymer. 07
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