Download GTU BE/B.Tech 2018 Winter 8th Sem New 2182901 Principles Of Textile Processes Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018

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Subject Code: 2182901 Date: 26/11/2018
Subject Name: Principles of Textile Processes
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Discuss about cleaning efficiency of blow room. 03
(b) State various limitation of negative friction type let off motion. 04

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(c) Discuss the factor affecting drafting force and derive equation to calculate 07
drafting force.

Q.2 (a) Calculate the traveler speed with the following: 03
Package radius — 2 cm, Spindle speed — 12000 rpm, T.P.I - 20
(b) Discuss the factors which influence uniform acceleration during picking. 04

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(c) Explain the retardation of shuttle with hinged swell, along with necessary 07
diagrams.
OR
(c) What are the reasons of end breaks at ring frame? Explain briefly. 07

Q.3 (a) Explain briefly about stretch control. 03

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(b) Explain various factors affecting drafting force. 04
(c) What is cylinder loading? Derive an equation to calculate cylinder 07
loading.
OR
Q.3 (a) State important aspect to be considered for designing of picking cam. 03

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(b) Discuss about trailing hook formation-mechanism on a card. 04
(c) Derive an equation to calculate the'fractional efficiency of comber. 07

Q.4 (a) Discuss factors affecting velocity of the shuttle on a loom. 03
(b) Write in short on ‘Power required for picking’. 04
(c) Explain the importance of size pick up. Hence discuss the various factors 07

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affecting it.
OR
Q.4 (a) Explain the alacrity of picking mechanism. 03
(b) Described interrelationship between shedding and beat up briefly. 04
(c) Explain the term kinematics and derive an equation for sley velocity and 07

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acceleration.

Q.5 (a) Explain short and long term variations during unwinding of Ring bobbins 03
on winding machines with suitable diagrams.
(b) Discuss about various factors affecting the unwinding tension. 04
(c) Derive an equation of yarn tension at any radius ‘r’. 07

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OR
Q.5 (a) Explain importance of I/J ratio in sley movement. 03
(b) Explain, chase length and coil density in reference to optimizing yarn 04
content on ring bobbin.
(c) Using suitable diagram discuss about velocity, acceleration and 07

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retardation of projectile.

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