Download PTU B.Tech 2020 March Textile 3rd Sem Textile Fibre I Question Paper

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Roll No. EEEEEEEEEEE Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech. (Textile Engg.) (2011 Onwards) (Sem.=3)

TEXTILE FIBRE-I

Subject Code : BTTE-301

M.Code : 71653

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 briefly :
   1. What are the drawbacks of jute fibre for its application in apparel?
   2. Why retting is an important process for bast fibre processing?
   3. Why silk fabrics exhibit a scroopy handle?
   4. Between medulated and unmedulated wool, which is superior and why?
   5. Why cellulose acetate exhibit glass transition temperature?

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   6. What may the reasons for relatively less bulk production of regenerated protein fibres?
   7. Why wet spinning of flax is done?
   8. Draw neat and labeled diagram of the longitudinal view of cotton and wool.
   9. Out of condensation and addition polymers, which will exhibit higher die-swell ratio and why?
   10. Define textile fibre. Mention four non apparel applications of textile fibres.

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SECTION-B

1. Describe the manufacture of Tencel fibre.
2. With the help of a neat sketch, briefly describe the solution dry spinning process. For which types of polymers solution dry spinning is used?
3. How alkali treatment influences the structure and properties of cotton?

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4. What is the action of alkali on protein fibres? Why exposure to alkali is considered more harmful for wool compared to silk?
5. Why wet strength of viscose reduces, where as that of cotton increases?

SECTION-C

1. Describe with neat sketch the various quenching systems for melt spinning. What are the essential and desirable properties of fibre forming polymers?
2. What is Polynosic fibre? Describe in detail the manufacture and properties of Polynosic fibre.

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3. With the help of a neat sketch describe the fine structure of wool. What are the factors that contribute to the differences in properties of cotton and viscose?

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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