GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Fibre Science & Elements Of Textile Structure
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (Old) EXAMINATION — WINTER 2019
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Subject Code: 172905 Date: 05/12/2019Subject Name: Fibre Science & Elements Of Textile Structure
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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| MARKS | |
|---|---|
| Q.1 (a) Write a brief note on fibre structure. Discuss the information to be gathered for investigating the same. | 07 |
| (b) Write a short note on “Swelling in fibres”. | 07 |
| Q.2 (a) Write note on heat of absorption and heat of wetting. | 07 |
| (b) Explain in detail on X-ray Diffraction Technique. | 07 |
| OR | |
| (b) Discuss the experimental methods used to determine water retention in fibres. | 07 |
| Q.3 (a) Discuss in detail the significance of twist in yarns. | 07 |
| (b) Explain the terms:-Primary creep, Secondary creep and explain the viscoelastic behavior of fibres. | 07 |
| OR | |
| Q.3 (a) Derive the relationship between Packing density and Rate of migration. | 07 |
| (b) Write a brief note on moisture absorption-in textiles. | 07 |
| Q.4 (a) Discuss the Electronic microscopy techniques used for investigating Fibre Structure. | 07 |
| (b) Discuss the order and disorder-in-the structure of fibre. | 07 |
| OR | |
| Q.4 (a) Discuss the theories on Mechanical properties in man-made fibres. | 07 |
| (b) Derive Contraction in‘yarn Cy = Y2(1+seca) and Retraction in yarn Ry =tan2 (a/2). | 07 |
| Q.5 (a) With a neat sketch ‘discuss the Peirce model for plain fabric. Discuss Fractional Cover and Total Cover. | 14 |
| OR | |
| Q.5 (a) Discuss the special conditions of Peirce model for plain fabric when angle (@) is small, when filling is straight and when fabric is jammed. | 14 |
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