Download GTU BE/B.Tech 2019 Summer 7th Sem Old 172905 Fibre Science And Elements Of Textile Structure Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem Old 172905 Fibre Science And Elements Of Textile Structure Previous Question Paper

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Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (OLD) EXAMINATION ? SUMMER 2019
Subject Code: 172905 Date: 21/05/2019

Subject Name:Fibre Science & Elements Of Textile Structure

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.

Q.1 (a) State the methods of investigation of fibre structure and explain the
NMR & Infrared radiation technique.
07
(b) Explain the role of moisture on fibre properties. Explain the terms: -
Differential heat of sorption and Integral heat of sorption.
07

Q.2 (a) Explain the terms:- Primary creep, Secondary creep and explain the
viscoelastic behavior of fibres.
07
(b) Explain idealized helical geometry of twisted yarn with neat sketch.
What are the assumptions made in it?
07
OR
(b) Discuss theory of crimp interchange. Calculate fractional cover of a
monofilament nylon fabric having 70 ends/inch and 60 picks/inch woven
with 150 x 150 Denier.
07

Q.3 (a) Write a short note on density of fibre and any method of measuring the
same.
07
(b) Mention different models of micro fine structure of fibres and write on
Paracrystalline model.
07
OR
Q.3 (a) Explain the extension and recovery in the rayon fibres. 07
(b) Write a short note on ?Swelling in fibres?. 07

Q.4 (a) Explain Co-Axial and Idealised helix model. 07
(b) Derive the relationship between Packing density and Rate of migration. 07
OR
Q.4 (a) Derive equations for Contraction and Retraction in yarn with reference
to surface twist angle.
07
Q.4 (b) Derive the relationship between (a) Specific volume of yarn and Twist
factor, (b) Discuss the disturbing factors in ideal packing of yarn.
07

Q.5 With a neat sketch discuss the Peirce model for plain fabric. Discuss
Fractional Cover and Total Cover.
14
OR
Q.5 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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