Download GTU BE/B.Tech 2019 Winter 7th Sem New 2172904 Yarn Structure And Fabric Geometry Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2172904 Yarn Structure And Fabric Geometry Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2172904 Date: 28/11/2019

Subject Name: Yarn Structure & Fabric Geometry
Time: 10:30 AM TO 01:00 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) Explain terms: twist multiplier and twist factor. 03
(b) Defined twist contraction and retraction factor & find their relationship. 04
(c) What are main assumptions of idealized twist geometry? Derive five basic
equations.
07

Q.2 (a) Explain hook?s law with diagram. 03
(b) Explain different form of yarn twisting with diagram. 04
(c) What are factors causing deviations from ideal structure? Explain briefly. 07
OR
(c) Derive the equations to calculate warp cover factor & weft cover factor. 07
Q.3 (a) Discuss about packing factor and specific yarn volume. 03
(b) Explains Hamilton ? Coil winding method of measuring yarn diameter. 04
(c)
Derive equation of retraction factor, ?? ??
= tan
2
(
?? 2
).
07
OR
Q.3 (a) Explain relation between filament extension with yarn extension with suitable
equation.
03
(b) What are the parameters of migration? Describe any two parameters in short. 04
(c) Write short note on modes of propagation of breaks. 07
Q.4 (a) What is use of tracer fibre techniques? 03
(b) Give limitation of fabric geometrical model. 04
(c) Establish the relationship between k & d/p for maximum cover. 07
OR
Q.4 (a) Define the terms: i. Initial modulus & ii. Work of rupture 03
(b) Draw typical load extension curve for the fabric with different zones. 04
(c) Described the factors that influence yarn tensile properties. 07
Q.5 (a) Discuss about isotropic and anisotropic properties of material. 03
(b) Describe phenomenon of crimp interchange. 04
(c) Derive the equations for Pierce?s geometry of plain woven fabric for the
special case when ?weft yarn is straight & warp is not jammed?.
07
OR

Q.5 (a) Discuss about poison?s ratio. 03
(b) Find the cloth cover if warp count & epi is 36?s & 72 respectively and weft
count & ppi is 40?s & 56 respectively.
04
(c) Explain the geometry of jammed condition for Race track cross-section. 07

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