Yarn Structure and Properties - 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 Structure and Properties

Textile Engineering & Fibre Science (TF) 2007

To produce a soft and flexible yarn, one needs

A

Fine fibres and high twist

B

Coarse fibres and high twist

C

Fine fibres and low twist

D

Coarse fibres and low twist

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2

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

Textile Engineering & Fibre Science (TF) 2007

On a classimat, as compared to the yarn fault B2, the fault D3 is

A

Thinner and longer

B

Thicker and longer

C

Thinner and shorter

D

Thicker and shorter

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3

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

Textile Engineering & Fibre Science (TF) 2008

Out of the following four diagrams A, B, C, and D, the correct variance-length (VL) curve for an ideal and commercial yarns is represented by

A

B

C

D

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4

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

Textile Engineering & Fibre Science (TF) 2009

Hairiness of ring spun yarn increases, when

A

Traveller weight increases

B

Front zone draft at ring frame increases

C

Spindle speed decreases

D

Ring rail speed increases

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5

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

Textile Engineering & Fibre Science (TF) 2009

On drawing and heat setting, the properties of synthetic fibres change such that

A

Modulus and tenacity increase, extensibility decreases

B

Modulus increases, tenacity and extensibility decrease

C

Modulus, tenacity as well as extensibility increase

D

Modulus and tenacity increase, extensibility remains same

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6

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

Textile Engineering & Fibre Science (TF) 2009

The CV% of 3-ply yarn produced using these single yarns will be approximately

A

4.93

B

5.66

C

6.93

D

9.24

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7

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

Textile Engineering & Fibre Science (TF) 2010

The thinnest Classimat fault among the following is

A

D4

B

E

C

F

D

I2

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8

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

Textile Engineering & Fibre Science (TF) 2010

Which of the following statements are NOT true?
(P) Ring spun yarns have higher fibre migration than DREF-2 friction spun yarns
(Q) The rotor spun yarns have uniform twist structure across the cross-section
(R) An jet spun yarn is formed by fibre wrapping
(S) Minimum number of fibres required for a particular count yarn is higher for ring spun yarns as compared to rotor spun yarns

A

Q, S

B

P, R, S

C

P, Q

D

Q, R, S

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9

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

Textile Engineering & Fibre Science (TF) 2013

Index of irregularity of yarn is approximately

A

0.88

B

1.13

C

1.33

D

1.53

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10

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

Textile Engineering & Fibre Science (TF) 2014

Consider the following figures. Choose the alternative that represents the correct relation

A

Graph A: End breaks/100 spindle hour vs Yarn strength CV % (positive slope)

B

Graph B: End breaks/100 spindle hour vs Yarn strength CV % (negative slope)

C

Graph C: End breaks/100 spindle hour vs Traveller running time (h) (negative slope)

D

Graph D: End breaks/100 spindle hour vs Spindle speed (rpm) (negative slope)

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11

2017 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2017

Pilling resistance of

A

Ring yarn is higher than open-end rotor yarn but lesser than air vortex yarn

B

Air vortex yarn is higher than ring yarn but lesser than open-end rotor yarn

C

Open-end rotor yarn is higher than ring yarn but lesser than air vortex yarn

D

Ring yarn is higher than air vortex yarn but lesser than open-end rotor yarn

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12

2017 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2017

The tenacity of a two-fold yarn is 1.1 times the tenacity of its component single yarn. The breaking load of the two-fold yarn is X times the breaking load of its single component yarn. Neglecting length contraction due to twist, the value of X, accurate to one decimal place, is __________

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13

2018 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2018

Heat-setting of melt-spun and drawn Nylon 6 filament yarn under slack condition leads to increase in its

A

Tenacity

B

Molecular orientation

C

Molecular weight

D

Dimensional stability

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14

2018 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2018

The technology that produces yarn with the maximum fibre migration is

A

Rotor spinning

B

Friction spinning

C

Air-jet spinning

D

Ring spinning

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15

2021 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2021

In Classimat system, the yarn fault H2, as compared to yarn fault C3, is

A

Thicker and longer

B

Thicker and shorter

C

Thinner and longer

D

Thinner and shorter

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16

2021 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2021

A 50 tex yarn with mass CV of 12.5 % is produced from staple polyester fibres each of 4.5 denier fineness. The index of irregularity of the yarn, (rounded off to two decimal places), is __________.

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17

2022 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2022

Yarn that has helically twisted fibres at the core and belts/wrappers on the surface is

A

Ring yarn

B

Rotor yarn

C

Compact yarn

D

Air-vortex yarn

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18

2023 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2023

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: In boiling water, polyester POY shows higher shrinkage than polyester FDY
[r]: Molecular chain orientation is higher in polyester FDY than in polyester POY

A

Both [a] and [r] are true and [r] is the correct reason for [a]

B

Both [a] and [r] are true but [r] is not the correct reason for [a]

C

Both [a] and [r] are false

D

[a] is true but [r] is false

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19

2023 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2023

Amongst the Classimat faults A2, B1, D4, H2 and I1, the correct statement(s) is/are

A

D4 and A2 are the thickest fault and the shortest fault, respectively

B

I1 and H2 are the longest fault and the thinnest fault, respectively

C

D4 and I1 are the thickest fault and the thinnest fault, respectively

D

B1 and H2 are the most objectionable fault and the longest fault, respectively

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20

2024 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Yarn Structure and Properties

Textile Engineering & Fibre Science (TF) 2024

A plied yarn is prepared by twisting two single yarns (A and B). Yarn A has a mean count of 20 tex and a coefficient of variation (CV) of count of 20%. Yarn B has a mean count of 30 tex and a CV of count of 10%. Neglecting twist contraction during plying, the CV (%) of the count of the plied yarn (in integer) is __________.

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