Subject Code:2142904
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Fibre Physics
Time:02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define the terms: (i) Load; (ii) Stress; and (iii) Specific Stress [03]
(b) Discuss various properties of polyester with respect to its structure. [04]
(c) What is difference between birefringence and dichroism? Define the quantitative term of dichroism. Explain two examples of dichroism. [07]
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Q.2 (a) What is difference between elongation, extension and strain? [03]
(b) Which property measures the toughness of fibre? Explain its technical aspects. [04]
(c) Describe the characteristic features and importance of stress-strain curve textile fibre. [07]
OR
(c) Explain with neat sketch the fine structure of wool. [07]
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Q.3 (a) Write short note on work factor. [03]
(b) What is yield point? Describe two geometrical methods for determination of yield point. [04]
(c) Explain the effect of humidity, temperature and light on tensile properties of fibres. [07]
OR
Q.3 (a) State three law of friction. [03]
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(b) What is ‘scroop’ effect? Explain with suitable example under what frictional conditions the material becomes scroopy. [04]
(c) Discuss the measurement of electrical resistance of fibres. [07]
Q.4 (a) Describe the technical features associated with H-bonds. [03]
(b) Explain in brief various requirements of fibre forming polymers. [04]
(c) Describe with neat diagram the working of SEM. [07]
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OR
Q.4 (a) Write a brief note on static electricity. [03]
(b) Write short note on optical orientation factor. [04]
(c) Discuss various techno physical aspects of reflection and lustre. [07]
Q.5 (a) Define the terms: (i) Humidity; (ii) Moisture Regain; and (iii) Moisture Content. [03]
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(b) Describe the structure of polyamide fibres. [04]
(c) Discuss about heat of sorption. [07]
OR
Q.5 (a) Describe the structure of silk. [03]
(b) Explain the applications of X-ray diffraction. [04]
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(c) Explain the structural changes in fibres on heating. [07]
Date:09/05/2019
Total Marks: 70
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