Subject Code: 2172904
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Name: Yarn Structure & Fabric Geometry
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
(a) Explain terms: twist multiplier and twist factor. [03]
(b) Defined twist contraction and retraction factor & find their relationship. [04]
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(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]
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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]
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(c) Derive equation of retraction factor, R, = tan2(a) [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]
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(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]
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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]
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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
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Q.5
(a) Discuss about Poisson’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]
Date: 28/11/2019
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Total Marks: 70
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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