Download GTU BE/B.Tech 2019 Summer 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 Summer 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 ? SUMMER 2019
Subject Code:2172904 Date:16/05/2019

Subject Name:Yarn Structure & Fabric Geometry

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.

MARKS

Q.1 (a) Enlist the structural features that are thought to have a major influence
on the physical properties & performance characteristics of yarn.
03
(b) Write in brief about role of twist in yarns. 04
(c) Explain the idealized helical yarn geometry stating the 07


assumptions made while developing it.

Q.2 (a) Yarns made from different spinning systems & of equal nominal count
will exhibit different values of yarn diameter. Justify the statement.
03
(b) Write in brief about Schwarz constant. 04
(c) Derive all the equations to calculate fabric cover. 07
OR
(c) Derive the equation: tan? = 0.0112vy
1/2
? 07
Q.3 (a) Define: Ideal Migration pattern. 03
(b) Write short note on: Hexagonal close packing. 04
(c) With a neat diagram explain Coil winding method of measuring yarn
dimensions.
07
OR
Q.3 (a) Define : Migration. 03
(b) Write in brief about Packing fraction. 04
(c) Derive: Contraction factor: Cy = ? (1+ sec?) 07
Q.4 (a) Explain importance of Tensile Properties of fabric. 03
(b) Explain Crimp interchange phenomenon. 04
(c) Explain Geometrical changes taking place during extension of fabric. 07
OR
Q.4 (a) Explain actual fractional coverage (d/p). 03
(b) Explain the terms work of rupture & work factor. 04
(c) Derive the equations for the Peirce?s geometry of special
case when ?Both the Yarns are jammed?.
07
Q.5 (a) Explain Poisson's ratio. 03
(b) Derive and discussed cover factor of square jammed fabric. 04
(c) Established relationship between two measures of cover k & d/p. 07
OR

Q.5 (a) Give limitation of fabric geometrical model. 03
(b) What is the difference between Anisotropy & Isotropy ? 04
(c) Find the cloth cover if warp count & epi is 60?s & 100 respectively and
weft count & ppi is 44?s & 70 respectively. Also calculate Yarn Balance
?.
07
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