Download PTU B.Tech 2020 March Textile 5th Sem Properties Of Fibres Question Paper

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Roll No. LTI [ ] Total No. of Pages : 02
Total No. of Questions : 09

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B.Tech. (Textile Engg.) (2011 Onwards) (Sem.-5)
PROPERTIES OF FIBRES
Subject Code : BTTE-501
M.Code : 71622
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.

SECTION-A

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1. Answer in brief :
   1. What is the use of electron microscopy in textiles?
   2. What do you mean by stress relaxation?
   3. How crystallinity of a fibre can be assessed from density?
   4. What is dichroic ratio?
   5. What is weak-link-effect?

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   6. How static charge can be controlled in textiles?
   7. What will be the moisture regain of a fibre having moisture content of 10%?
   8. Draw and compare load-elongation curves of dry and wet cotton fibre.
   9. What is glass transition temperature?
   10. Explain yield point in load elongation curve of textile fibre.

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SECTION-B

1. Discuss hysteresis of moisture absorption with graphical illustration.
2. State the principle of IR spectroscopy. What is its use in structural investigation of textiles?

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3. What is the significance of friction in textiles? Explain a method of measurement of yarn to metal friction.
4. Explain Maxwell model to characterize visco-elastic behavior of material.
5. Define birefringence. How it can be measured?

SECTION-C

1. Describe X-ray diffraction methods of measurement of crystallinity and orientation of textile fibre in detail.

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2. Write down the factors affecting the results of tensile test. Draw creep recovery curve and explain. 5+5
3. What do you mean by static and dynamic tensile testing? Describe a test method of measurement of dynamic modulus of textile material. 3+7

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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