Download GTU BE/B.Tech 2019 Summer 4th Sem New 2142904 Fibre Physics Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142904 Fibre Physics Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142904 Date:09/05/2019
Subject Name: Fibre Physics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.


MARKS

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

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
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
(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
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
(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
(c) Explain the structural changes in fibres on heating. 07
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