Anna University Technology of Yarn and Fabric Production Question Paper



IV Semester Textile Technology


Time : Three hours                                                                        Maximum : 100 marks

Answer ALL questions.

PART A — (10 ´ 2 = 20 marks)

1. With a simple sketch explain the principle of any one type of cotton gin.

2. What is the purpose of ‘Doubling’? What is the ‘Doubling factor’ in a Drawframe?

3. What would be the expected trash percentage in cotton bales meant for
(a) course counts, (b) medium counts and (c) fine counts?

4. What is the highest practical running speed of a shuttle loom weaving a plain fabric using tappets?

5. Name the motions that you would expect to find on an automatic loom that would not be found in a plain loom.

6. In tabular form give the expected production per spindle of a modern ringframe for different counts.

7. Explain the concept of ‘‘Maximum Spinable Count’’.

8. Give a recipe for a size mix meant to size 40s Cotton Yarn.

9. Outline the purpose of mixing in preparing feed material for spinning.

10. What is twist factor? What are the formulas for twist factor in the English and Tex counts.

PART B — (5 ´ 16 = 80 marks)

11. Explain the principles of the open loop and the closed loop Autoleveller. Discuss which machine/s should be fitted with an autoleveller and why.

12. (a)     Explain the working of a roving frame, giving the range of sliver hanks and machine drafts you would expect for (i) course counts (ii) medium counts and (iii) fine counts.


             (b)     Explain the purpose and working of a Card, describing what happens to cotton as it is processed by it. Give the expected production of modern high production cards for different counts of sliver.

13. (a)     Explain the purpose of a blow room and give the sequence of machines in it. Describe the purpose of each machine and what happens to the cotton in that machine.


             (b)     What is the purpose of sizeing warp yarns? Describe the construction and working of a typical sizeing machine.

14. (a)     Name the motions of a plain loom and describe how these motions work together to convert yarn to fabric.


             (b)     Describe the working of a rotary combing machine and discuss the need for this process.

15. (a)     Compare and contrast the different types of spinning systems you know of giving the merits and demerits of each system.


             (b)     Draw the representation of a plain weave, other simple patterns such as 1 up/2 down and various different twills. Give heald and lift diagrams for each weave and compare and contrast the properties of fabrics woven to these weaves.




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