Basic Viva for Textile Engineers (Spinning related) Part-1

 

1.         What is yarn?

Ans: Yarn is a long continuous length of interlocked fibers, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, and rope making.

2.         What is the first process/ machine in yarn production?

Ans. Blow room.

3.         What is the second process/ machine in yarn production?

Ans. Carding machine.

4.         What process / machine is used after carding?

Ans. Draw frame.

5.         What process is used after draw frame?

Ans. Simplex.

6.         What process is used after simplex?

Ans. Ring frame.

7.         What is the production of blow room?

Ans. Lap.

8.         What is the production of carding machine?

Ans. Sliver.

9.         What is the production of draw frame?

Ans. Sliver/Drawing sliver

10.     What is the production of simplex?

Ans. Roving.

11.     What is the production of ring frame?

Ans. Yarn.

12.     1 lb(pound) to kg.

Ans. 0.4536 kg = 453.6 gm = 16 ounce(oz).

13.     What is the input of carding machine?

Ans. Lap/Now chute feed system is being used.

14.     What is the input of combing machine?

Ans. Sliver lap.

15.     What is the input of simplex?

Ans. Drawn sliver.

16.     What is the input of ring frame?

Ans. Roving.

17.     What is fiber fineness?

Ans. Fineness is one of the most important parameter determining the yarn quality (Fine or Coarse).

18.     How fineness is specified for cotton?

Ans. Fineness is specified by micronaire value for cotton.

19.     The maturity of cotton is defined in terms of the development of cell wall (Yes/no).

Ans. Yes.

20.     A fully mature fibre has a well developed thick cell-wall (Yes/no).

Ans. Yes.

21.     An immature fibre has a very thin cell-wall (Yes/no).

Ans. Yes.

22.     In mature fibre, dye absorption is high (yes/no)

Ans. Yes

23.     In immature fibre, dye absorption is low (yes/no).

Ans. Yes

24.     What is staple length?

Ans. The average length of spinnable fibre is called staple length.

25.     If staple length is increase then yarn quality is also increase (yes/no).

Ans. Yes

26.     Toughness of fibre has a direct effect on yarn and fibre strength (yes/no).

Ans. Yes

27.     If fibre strength is higher, then yarn and fabric strength is also higher (yes/ no).

Ans. Yes

28.     Short fibres deteriorate the yarn strength and uniformity (true/false).

Ans. True.

29.     What is the minimum strength for a textile fibre?

Ans. Approximately 6 CN/tex (about 6km breaking length)

30.     What do you know about Presley index =?

Ans. Breaking load in Ibs/Bundle weight in mg.