Fibre Structure and Morphology - Textile Fibres - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2007

The main distinguishing features of a hollow circular filament to that of a solid circular filament of the same denier are

A

Higher bending rigidity and higher surface area

B

Higher thermal insulation and lower surface area

C

Lower bending rigidity and higher surface area

D

Higher moisture regain and higher surface area

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2

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2007

If the density of polyester fibres is 1.399 g/cc, the fractional density crystallinity of polyester would be approximately

A

0.54

B

0.57

C

0.60

D

0.63

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3

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2007

Assuming a linear two phase model of crystalline and amorphous regions for these fibres, the amorphous length would be

A

50 Å

B

60 Å

C

70 Å

D

80 Å

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4

2008 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2008

Choose the correct alternative for the following assertion-reason pair,
Assertion: The birefringence of oriented textile grade acrylic fibre is negative
Reason: This is due to the presence of nitrile groups projecting outwards from the main polymer backbone

A

[a] is wrong, [r] is correct

B

[a] is correct, [r] is wrong

C

[a] is wrong, [r] is wrong

D

[a] is correct, [r] is correct

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5

2010 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2010

Mature cotton fibres have average degree of cell wall thickening (θ) of about

A

0.1

B

0.2

C

0.6

D

1.0

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6

2011 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2011

Density of the above fibre increased by 2.2 % when drawn. The corresponding change (%) in crystallinity is approximately

A

50

B

100

C

150

D

200

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7

2013 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2013

Birefringence of filament yarn is related to its

A

Crystallinity

B

Orientation

C

Individual filament denier

D

Density

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8

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2017

During crystallization of polyester

A

Heat is evolved

B

Heat is absorbed

C

No exchange of heat takes place

D

Small molecule such as water is eliminated

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9

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2017

Group I consists of names of fibres. Group II gives characteristic structural features of these fibres. Match the fibre from Group I to its respective feature from Group II

A

Group I	Group II
P. Cotton	1. Para- and ortho-cortex
Q. Jute	2. Primary and secondary wall
R. Wool	3. Fibroin β-sheets
S. Silk	4. Multicellular

B

P-4, Q-1, R-2, S-3

C

P-2, Q-4, R-1, S-3

D

P-2, Q-3, R-4, S-1

E

P-2, Q-4, R-3, S-1

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10

2018 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2018

The cross-sectional shape of a fibre affects the following properties of yarn
P. Lustre
Q. Torsional rigidity
R. Flexural rigidity
S. Packing density

A

P & Q only

B

P & R only

C

P, Q & R only

D

P, Q, R & S

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11

2020 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2020

A cotton fibre has degree of cell wall thickening (θ) of 0.9 and perimeter of 40 μm. The actual cross-sectional area of the wall (μm²) of the fibre (rounded off to 1 decimal place) is __________.

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12

2022 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2022

Cotton fibre has maximum amount of cellulose in

A

Cuticle

B

Primary cell wall

C

Secondary cell wall

D

Lumen

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13

2022 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2022

High extensibility of wool fibre is due to

A

Presence of scales

B

\(\alpha\)-helix structure of proteins

C

Cross-linking

D

\(\beta\)-sheet structure of proteins

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14

2023 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2023

The amide linkage is NOT present in

A

Wool

B

Aramid

C

Lyocell

D

Nylon 66

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15

2023 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2023

In the amorphous phase, polymer chains prefer to be in a random coil conformation to

A

Maximize entropy

B

Maximize enthalpy

C

Minimize entropy

D

Minimize enthalpy

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16

2024 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2024

Three melt-spun fibre samples A, B and C produced from same polymer under different conditions are found to have densities \( 1.10 \, \text{g/cm}^3 \), \( 1.15 \, \text{g/cm}^3 \) and \( 1.20 \, \text{g/cm}^3 \), respectively. If the mass fraction based degree of crystallinity (\( x_c \)) of A and C is 0.45 and 0.75, respectively, then \( x_c \) for B (rounded off to 2 decimal places) is __________.

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17

2025 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2025

The fibre which does NOT contain 1,4-glycosidic bonds is

A

Polynosic

B

Lyocell

C

Silk

D

Ramie

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18

2025 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering & Fibre Science (TF) 2025

Amongst the following, the exothermic transition(s) is/are

A

glass transition

B

crystallization

C

melting

D

sublimation

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19

2026 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Structure and Morphology

Textile Engineering and Fibre Science (TF) 2026

Amongst the following factors, the one which decreases the glass transition temperature (\(T_g\)) of a polymer is ________.

A

presence of bulky side groups

B

aromatic groups in polymer backbone

C

aliphatic linear polymer backbone

D

presence of polar groups

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