This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3132606 Date: 26/11/2019
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Subject Name: Numerical methods & Viscoelastic models of Elastomers
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | ||
| Q.1 | (a) State the differences between Young modulus, Bulk modulus and Modulus of Rigidity. | 03 |
| (b) Give the concept of Auxetic materials with suitable examples and figures. | 04 | |
| (c) Explain the importance of Poisson’s Ratio and Derive equations for relation between the different modulus. | 07 | |
| Q.2 | (a) A nylon string has a diameter of 2mm, pulled by a force of 100N. Determine the tensile stress. | 03 |
| (b) List out the factors affecting viscosity. | 04 | |
| (c) Explain the viscosity theory with suitable example. | 07 | |
| OR | ||
| (c) Draw the schematic diagram of “Oswald Viscometer” and explain it in detail. | 07 | |
| Q.3 | (a) Write a brief note on Newton’s model. | 03 |
| (b) Derive the stress relaxation experiment equation for Voight model. | 04 | |
| (c) Discuss in detail about the non Newtonian fluid. | 07 | |
| OR | ||
| Q.3 | (a) Explain a brief note on Deborah number. | 03 |
| (b) Give the broad classification of ‘polymeric material based on mechanical behavior. | 04 | |
| (c) Explain in detail about time dependent fluids. | 07 | |
| Q.4 | (a) How can you estimate the Ty with the help of Bulk properties? | 03 |
| (b) List the required properties for Elastomers. | 04 | |
| (c) Discuss in detail about the structure of an ideal rubber. | 07 | |
| OR | ||
| Q.4 | (a) Show the dependence of shear rate on shear stress for Newtonian fluid with the help of diagram. | 03 |
| (b) Summarize the molecular requirements of elastomer. | 04 | |
| (c) Derive the equation for force constant using entropy elasticity theory. | 07 | |
| Q.5 | (a) Define the terms: (i) Glass transition temperature (ii) Flow temperature (iii) Melting point | 03 |
| (b) Classify the different types of motions exhibited within a polymeric material. | 04 | |
| (c) Discuss about the nature of curve showing variation in specific volume versus temperature for polymeric substances. | 07 | |
| OR | ||
| Q.5 | (a) Relate the Glass transition temperature and Melting point for symmetrical and unsymmetrical polymers respectively. | 03 |
| (b) Summarize the change of state with temperature in polymeric materials. | 04 | |
| (c) Discuss in detail about the factors influencing the Glass transition temperature. | 07 |
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This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University