GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
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Subject Code:2172902 Date:19/01/2021Subject Name:Modern Weaving Technology
Time:10:30 AM TO 12:30 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) What are the yarn quality requirements for shuttle-less looms. [03]
(b) Which parameters of air are to be considered for supply to air jet loom? [04]
(c) State the importance of selvedges. Explain different types of selvedges formed on shuttleless looms with diagram. [07]
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Q.2 (a) Monitoring and control of weaving machines by microprocessor is easier way to operate the loom- Justify you answer. [03]
(b) What are the main features of rapier weaving mechanism? [04]
(c) State the importance of weft accumulators. With the help of neat diagrams, explain the working of weft accumulator. [07]
Q.3 (a) Differentiate between conventional weaving machines and modern shuttles weaving machines. [03]
(b) Write on any one type of yarn tensioning unit of modern warping machine. [04]
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(c) Highlight in detail the features of the state-of-the-art sizing machines. [07]Q.4 (a) How air can be measured and write about-air quality? [03]
(b) Compare drum type of accumulators and loop type accumulators. [04]
(c) What type of fabric is woven on air-jet weaving machine. Explains blowing sequence of relay nozzles and lining control. [07]
Q.5 (a) The length measuring device-is necessary on air-jet looms. Give reason. [03]
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(b) What is the equation for drag force acting on weft yarn on air jet loom? Explain briefly. [04](c) Describe picking mechanism and nozzle pump design in water jet loom. [07]
Q.6 (a) Discuss pre-requisites of water jet loom. [03]
(b) Discuss merits and demerits of water-jet weaving machine. [04]
(c) Explain the path of yam of water jet loom in warp and weft direction. [07]
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Q.7 (a) What are the criteria for classifying rapier looms? [03]
(b) What is rapier head? Explain with diagram. [04]
(c) What are the differences between gabler system and dewas system of rapier loom? [07]
Q.8 (a) How tucked in selvedge is formed on projectile loom? [03]
(b) Which different types of projectiles and projectile guides are available? How many projectiles are required for 360 cm. wide loom? [04]
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(c) Explain torsion bar picking mechanism of projectile loom with diagram. [07]--- Content provided by FirstRanker.com ---
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