GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
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Subject Code:2182901 Date:25/01/2021Subject Name:Principles of Textile Processes
Time:02:00 PM TO 04:00 PM Total Marks: 56
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) Explain, how to evaluate cleaning efficiency of blow room? 03
(b) Explain interrelationship between shedding and beating. 04
(c) What is perfect drafting? Explain theory of drafting put forwarded by Foster. 07
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Q.2 (a) Define eccentricity of sley. Also mention any two ways of changing eccentricity of sley. 03
(b) State equations of unwinding yarn tension of ring bobbin and discuss each terms which are affecting the unwinding tension. 04
(c) With the help of retardation curve compare the performance of conventional hinged swell with that of floating swell. 07
Q.3 (a) What are the various factors affecting drafting force, explain in briefly. 03
(b) Explain trailing hook formation mechanism on a card. 04
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(c) What is cylinder loading? Derive an equation to calculate cylinder loading. 07 Q.4 (a) What are the limitations of negative friction type let off motion? 03
(b) State important aspect to be considered for designing of picking cam. 04
(c) Define and derive comber fractionation efficiency. 07
Q.5 (a) Which are factors affecting velocity of the shuttle on a loom? 03
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(b) State various reasons of end-breaks at ring frame. 04(c) Derive an equation to calculate drafting force. 07
Q.6 (a) How to find out fiber configuration in card sliver? 03
(b) How unwinding tension varies when unwinding of yarn take place from ring bobbin? “Also, state importance of unwinding accelerations. 04
(c) What is size pick up? Discuss the various factors affecting it. 07
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Q.7 (a) Explain the alacrity of picking mechanism. 03
(b) Write in short on ‘Power required for picking’. 04
(c) Derive an equation for sley displacement and velocity for four link sley drive. 07
Q.8 (a) Only draw diagram to show the velocity, acceleration and retardation of projectile. 03
(b) Discuss briefly various aspects of weft insertion in airjet loom. 04
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(c) Derive an equation of yarn tension at any radius ‘r’. 07--- Content provided by FirstRanker.com ---
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