Subject Code:2172904
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
Subject Name:Yarn Structure & Fabric Geometry
Time:10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define the terms: a) Twist b) Twist multiplier [03]
(b) State role of yarn structure on yarn and fabric properties [04]
(c) Derive the equation: tana = 0.0112 vy Y2 [07]
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Q.2 (a) What do you mean by twist contraction and retraction factor? [03]
(b) State phenomenon of Crimp interchange. [04]
(c) Derive the equations to calculate warp cover factor & weft cover factor. [07]
Q.3 (a) State classification of yarn. [03]
(b) Draw figure of idealized twist geometry and derive five basic equations. [04]
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(c) Describe the disturbing factors that operate in determining real yarn structures. [07]
Q.4 (a) Define with reference to migration: a) Mean fibre position (y) b) RMS deviation (D) [03]
(b) Explains Hamilton — Coil winding method of measuring yarn diameter. [04]
(c) Derive the Retraction factor, Ry = tan? (a/2). [07]
Q.5 (a) State importance of cloth cover. [03]
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(b) Find the cloth cover if warp count & epi is 30’s & 62 respectively and weft count & ppi is 24’s & 46 respectively. [04]
(c) Establish the relationship between k & d/p for maximum cover. [07]
Q.6 (a) Discuss about modulus of elasticity. [03]
(b) What do you mean by Fractional cover of warp and weft? [04]
(c) Explain the geometry of jammed condition for Race track cross-section. [07]
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Q.7 (a) Define with-reference to fabric: a) Isotropic, b) Anisotropic. [03]
(b) Give limitation of fabric geometrical model. [04]
(c) Derive the equations for Pierce’s model for the geometry of Plain woven fabric when “Neither of the yarn is straight nor it is jammed. [07]
Q.8 (a) Define the terms: Poisson ratio. [03]
(b) Explain load-extension curve for the woven fabric showing different zones. [04]
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(c) Described the factors that influence yarn tensile properties. [07]
Date:25/01/2021
Total Marks: 56
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