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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3132902 Date: 28/11/2019
Subject Name: Yarn Manufacture I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
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Q.1 (a) What are the objectives of ginning machine? 03
(b) With suitable sketches discuss the modern development in 04 Cylinder region of Card.
(c) Explain the passage of material on Card with a labelled figure. 07
Q.2 (a) What are the objectives of Card? Why Carding machine is 03 known as the heart of a spinning mill?
(b) What are the advantages and disadvantages of manual 04 picking and machine picking of cotton fibers?
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(c) Which fibers are suitable to process in Macarthy ginning 07 machine? With a suitable sketch show the construction and working of Macarthy ginning machine.
OR
(c) Which fibers are suitable to process in Saw ginning machine? 07 With a suitable sketch show the construction and working of Saw ginning machine.
Q.3 (a) What are the objectives of Blow room? 03
(b) What is the function of coarse cleaning or (Pre cleaner) 04 machine in Blowroom.line? Draw a labelled figure to show any one coarse cleaning machine.
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(c) Differentiate between blending and mixing? Explain any one 07 mixing machine used in blow room line with a labelled figure.
OR
Q.3 (a) What is the function of Grid Bar? With suitable sketches show 03 the different type of Grid bars.
(b) With a suitable diagram explain the construction and working 04 of any one Fine cleaning machine used in Blowroom line.
(c) What is the function of Bale opener in Blowroom line? 07 Explain the construction and working of an automatic bale opener with a labelled figure.
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Q.4 (a) What is the function of Autoleveller? Which type of 03 autoleveller is used in Card?
(b) Define Grinding process? With a suitable sketch explain any 04 one grinding tool used in Card.
(c) Explain Carding and stripping action in Card with suitable 07 figures. Also, draw figures to show the different types of Card clothing.
OR
(a) Draw a flowchart to show the passage of material in Tandem 3 card.
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(b) Explain the working of a dust removal system used in modern 04 Blowroom line with a labelled figure.
(c) Draw a labelled figure of chute feed system. Discuss the 07 advantages and disadvantages of modern chute feed system over a conventional lap feed system?
Q.5 (a) Draw labelled figures to show any two opening devices used 03 in Blow room line.
(b) In a Blowroom process, trash content in raw cotton and lap 04 was 5% and 1% respectively. Calculate the cleaning efficiency of Blow room line.
(c) What are the objective of coiling mechanism? What are the 07 different types of coiling mechanisms used in Card? Draw the sketches showing different coiling mechanisms.
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OR
Q.5 (a) With a suitable sketch discuss the construction of flats in 03 Carding machine.
(b) Write in brief about the common defects and its remedies 04 observed in Card sliver.
(c) Calculate production of Carding machine in Kilograms (Kgs) 07 from the following data :
(1). Doffer diameter: 28 inches, (i1). Doffer speed: 30 rpm, (iii). Working Hours: 8 hours, (iv). Efficiency: 95%, and (v). Hank of sliver (Ne): 0.12.
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