Yarn Geometry and Twist - Yarn Manufacture, Yarn Structure and Properties - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2007

The contraction of a yarn upon twisting is 1.07. The twisted yarn count is 30 tex. If 2 dex fibres are used to produce the yarn, the number of fibres present in yarn cross-section is

A

140

B

145

C

150

D

160

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2

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2008

If the specific volume of yarn is increased by 21%, the percentage increase in yarn diameter would be

A

4.6

B

10.0

C

10.5

D

21.0

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3

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2008

In a flat yarn, the number of filaments in the yarn cross section is 271. The yarn is divided into 5 segments of equal radial increments which are numbered as 1, 2, 3, 4 and 5, from yarn core to surface respectively. The approximate number of fibres in the 4th segment is

A

50

B

80

C

90

D

110

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4

2009 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2009

Ring spun cotton yarns of 30, 40, 50 and 60 tex are made from the same fibre. All these yarns are spun with a constant twist per cm of 10. The yarns can be arranged in descending order of helix angle of surface fibres as

A

30, 60, 50, 40

B

40, 60, 50, 30

C

30, 40, 50, 60

D

60, 50, 40, 30

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5

2009 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2009

With increasing twist, spun yarn strength

A

Increases continuously

B

Decreases continuously

C

Decreases initially and then increases

D

Increases initially and then decreases

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6

2009 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2009

The packing coefficient of a yarn with 100 fibres is increased by 10%, the percentage change in yarn diameter will be approximately

A

−16.9

B

−10.9

C

−4.9

D

4.9

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7

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2010

Which of the following yarns is the finest?

A

10s Ne

B

10 Tex

C

100s Ne

D

100 Tex

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8

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2010

Match the elements of Group I and Group II.
Group I
P. Drafting waves
Q. Periodic faults
R. Yarn hairiness
S. Wrapper fibres
Group II
1. Spinning triangle
2. Spinning tension fluctuations
3. Floating fibres
4. Immature fibres
5. Bridging fibres
6. Eccentric bottom roller

A

P-6, Q-1, R-2, S-5

B

P-3, Q-6, R-1, S-5

C

P-4, Q-6, R-1, S-2

D

P-3, Q-5, R-1, S-6

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9

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2010

The direct twist factor of 35 Nm yarn is 36 tpcm.tex^1/2. The twist per inch of the yarn is approximately

A

17

B

19

C

21

D

23

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10

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2010

If the diameter of the above yarn is 0.28 mm, the twist angle will be approximately

A

10°

B

21°

C

30°

D

40°

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11

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2011

20s, 30s, 40s and 50s Ne cotton yarns have the same twist per cm. The yarn having maximum fibre obliquity is

A

20s Ne

B

30s Ne

C

40s Ne

D

50s Ne

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12

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2011

A filament yarn of 300 denier is being spun at a take up speed of 900 m/min. Assuming the density of the melt as 1.2 g/cm³, the throughput speed (cm³/min) at the spinneret would be ________

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13

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2011

The coarsest yarn amongst the following is

A

100 Ne

B

50 denier

C

50 dtex

D

200 Nm

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14

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2013

On twisting, the denier of a multifilament yarn consisting of 300 filaments of 3 denier each becomes 1100. If 11 km of untwisted filament yarn is twisted, its length in km will be ________.

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15

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2013

The daily production of a mill is 1200 kg of 30 tex and 1200 kg of 20 tex yarns. The average yarn tex produced by this mill is

A

23

B

24

C

25

D

26

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16

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2014

A 25 tex cotton yarn has a twist factor of 30. The yarn twist, in turns per cm, is

A

4

B

5

C

6

D

7

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17

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2014

A polypropylene yarn, melt spun at a throughput rate of W (g/s) and winding speed of S (m/min), was drawn to a draw ratio of D. The denier of this yarn is a function of W, S, D and a constant K. The value of K, accurate to the nearest integer, is……….

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18

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2014

The twist contraction factor of a filament yarn is 1.06. For producing 5 ton twisted yarn of 50 tex, the untwisted yarn length required, in km, accurate to the nearest integer, is …….

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19

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2014

The surface helix angle of a fibre in a yarn of 0.3 mm diameter is 30°. Assuming ideal helix geometry, the helix angle (in degrees) of a fibre situated at 0.1 mm from the yarn axis, accurate to one decimal place, will be ......

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20

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Geometry and Twist

Textile Engineering & Fibre Science (TF) 2014

A yarn is passing over a multiplicative tensioner with an angle of wrap of 90°. If the input yarn tension is 100 cN and coefficient of friction between yarn and tensioner is 0.2, then the output yarn tension in N, accurate to two decimal place, would be ......

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