Fibre Properties and Identification - Textile Fibres - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2007

The increase in strength of cotton fibres as a result of increase in moisture regain is due to

A

Decrease in hydrogen bonds

B

Increase in crystallinity

C

Increase in orientation

D

Increase in both crystallinity and orientation

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2

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2007

If d is the diameter of a fibre, its flexural rigidity is proportional to

A

d

B

d²

C

d³

D

d⁴

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3

2007 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2007

Nylon 6 and nylon 66 filaments can be distinguished by

A

Melting point test

B

Burning test

C

Optical microscopy

D

Density measurement

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4

2008 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2008

The breaking extension of flax, cotton, jute and wool (at 65 % r.h. and 20 °C) in the decreasing order is

A

Wool > Jute >Cotton >Flax

B

Wool > Cotton > Jute >Flax

C

Wool > Jute > Flax > Cotton

D

Wool > Cotton > Flax > Jute

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5

2008 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2008

In the context of textile fibres, choose the INCORRECT statement among the following

A

Swelling in fibres is not anisotropic

B

Cotton fibres do not melt

C

Synthetic fibre forming polymers are linear

D

Wool fibre has higher breaking elongation than silk fibre

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6

2008 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2008

When denier of a fibre is doubled, its diameter increases by

A

0.41 times

B

1.41 times

C

Two times

D

Four times

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7

2008 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2008

Work factor of glass fibre is

A

Less than 1/2

B

1/2

C

Greater than 1/2

D

1

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8

2009 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2009

The moisture regain (%) of nylon fibre is in the range

A

2.0 – 3.0

B

3.5 – 4.5

C

5.0 – 6.0

D

6.5 – 7.5

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9

2009 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2009

The density of polyester fibre is

A

More than that of cotton

B

More than that of nylon but less than that of cotton

C

Same as that of nylon

D

More than that of polypropylene but less than that of nylon

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10

2009 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2009

With increase in relative humidity from 0 to 100%, the tensile properties of cotton fibre change such that

A

Modulus and strength increase, extensibility decreases

B

Modulus decreases, strength and extensibility increase

C

Modulus and strength decrease, extensibility remains same

D

Modulus and strength decrease, extensibility increases

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11

2010 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2010

Match the elements of Group I and Group II.\nGroup I
P. Polypropylene
Q. Cotton
R. Polyester
S. Wool
Group II
1. Poor hydrolytic stability
2. Excellent thermal resistance
3. Excellent elastic recovery
4. Poor resistance to acid
5. Higher wet strength
6. Excellent chemical resistance

A

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

B

P-2, Q-3, R-6, S-3

C

P-4, Q-5, R-1, S-2

D

P-6, Q-1, R-2, S-3

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12

2011 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2011

Density of cotton fibre is approximately

A

1.52 denier

B

1.52 g/tex

C

1.52 kg/m³

D

1.52 g/cm³

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13

2011 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2011

Denier of the fibre is approximately

A

1

B

2

C

3

D

4

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14

2013 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2013

The fibre that dissolves in 59% (w/w) sulfuric acid solution is

A

Wool

B

Polypropylene

C

Cotton

D

Viscose

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15

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2017

The characteristic observation in burning test of cotton fibre is

A

Burns readily with whitish ash as residue

B

Burns with dripping

C

Burns with burning hair smell

D

Melts and forms a hard bead

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16

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2017

White specks observed in dyed cotton fabric are attributed to

A

Poor wash fastness of dyes

B

Non-uniform agitation of dye bath

C

Low temperature of dyeing

D

Presence of immature cotton fibres

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17

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2017

Wool gives warmth because it has

A

P. A helical structure which can entrap air

B

Q. High heat of sorption

C

R. Low crystallinity

D

S. High extensibility

E

P and Q only

F

Q and R only

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18

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2017

A T-shirt is produced from cotton fibre of 1520 kg m^-3 density, 1.4 dtex fineness and 30 mm length. The total number of fibres in the T-shirt of 0.15 kg is__________ × 10⁶

Check answer

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19

2017 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2017

At 65 % relative humidity and 20 °C temperature, the moisture regain of the fibres (P) Wool (Q) Nylon 6 (R) Cotton (S) Polyester follows the order

A

P > Q > R > S

B

P > R > Q > S

C

R > P > Q > S

D

R > P > S > Q

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20

2018 · Textile Engineering & Fibre Science · Textile Fibres · Fibre Properties and Identification

Textile Engineering & Fibre Science (TF) 2018

The pair of fibres most prone to accumulation of static charge is

A

Cotton and Polyester

B

Silk and Polyester

C

Polyester and Polypropylene

D

Silk and Polypropylene

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