Download GTU BE/B.Tech 2017 Winter 3rd Sem Old 132601 Basic Rubber Science Question Paper

Seat No.: Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2017

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Subject Code:132601 Date:17/11/2017

Subject Name: Basic Rubber Science

Time: 10:30 AM to 01:00 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 Answer the following. (14)

1. What do you mean by Degree of Polymerisation?
2. Define the terms: ‘Bulk modulus’ and ‘Shear modulus’.

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3. List the effects associated with friction.
4. State the Fick’s Law of mass transfer.
5. What is the relation between critical angle and refractive index of any medium?
6. Define the terms: ‘Lyophilic sols’ and ‘Lyophobic sols’.
7. State the Laws of Floatation.

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Q.2 (a) Write a short note on Suspension polymerization. (07)

Q.2 (b) Discuss the conditions for rubber like elasticity in the polymers. (07)

OR

(b) Write a short note on Structure-property relations in rubbers. (07)

Q.3 (a) Describe the methods to determine relative density of various types of substances including powders and liquid. (07)

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(b) Write a short note on refractive index of polymer. (07)

OR

(a) Explain the term surface tension. How is surface tension measured by Leconte du Noüy Tensiometer? (07)

Q.5 (b) What do you mean by friction? Discuss about the various types of it. (07)

Q.5 (a) Write about the electrical properties of Polymers. (07)

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(b) Discuss the Zeroth Law of Thermodynamics. Also write about Triple point cell. (07)

OR

(a) Write in detail about the effect of compounding on transmissibility. (07)

(b) Describe the different modes of heat transfer. And write about Convective mode of heat transfer. (07)

(a) Discuss in detail about the applications of colloids. (07)

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(b) List the different methods available to prepare colloidal solution. Discuss any two in detail. (07)

OR

(a) Discuss the types of colloidal systems with examples. (07)

(b) Write a short note on Emulsion. (07)

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