Synthetic Fibres - Textile Fibres - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2007

Nylon 6 polymer is produced from caprolactum. The catalyst used in the process is

A

Magnesium Acetate

B

Cobalt Acetate

C

Acetic acid

D

Water

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2

2007 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2007

Match the elements of Group I and Group II and choose the correct answer from amongst A, B, C, and D

Group I	Group II
P   Polyester fibres	1   Melt spinning
Q   Acrylic fibres	2   Dry spinning
R   Nylon fibres	3   Wet spinning
S   Viscose rayon fibres	4   Xanthation
	5   Drawing
	6   Coagulation

A

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

B

P-1, Q-3, R-5, S-4

C

P-5, Q-6, R-4, S-5

D

P-6, Q-5, R-2, S-3

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3

2008 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2008

Nylon 6, nylon 66, wool and silk can all be classified as

A

Polyethers

B

Polyesters

C

Polyamides

D

Polyolefins

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4

2008 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2008

Mixing of two polymer melts yields

A

Block copolymers

B

Random copolymers

C

Alternate copolymers

D

Polymer blends

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5

2008 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2008

Polypropylene is unstable to both heat and light because of

A

Low melting point

B

Very low Tg

C

Presence of tertiary carbon

D

Helical configuration of polymer chains

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6

2010 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2010

The acrylonitrile content in the modacrylic fibre forming polymer is

A

85-95%

B

40-80%

C

10-30%

D

25-85%

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7

2010 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2010

For poly (ethylene terephthalate), which of the following will have the highest crystallinity?

A

Amorphous chips

B

LOY

C

POY

D

FDY

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8

2011 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2011

Ziegler Natta catalyst is used in the polymerization of

A

PET

B

Nylon

C

Acetate

D

Polypropylene

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9

2011 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2011

The cross-section of spinneret used for producing hollow fibres is

A

shaped

B

Rectangular

C

Annular concentric

D

Triangular

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10

2011 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2011

Consider the following assertion [a] and reason [r] in the case of high bulk yarn.
[a] Acrylic high bulk yarn is a commercial success but not the polypropylene high bulk yarn.
[r] Amorphous orientation can be easily frozen in acrylic fibres but not in polypropylene fibres.

A

[a] is right and [r] is wrong

B

[a] is wrong and [r] is right

C

Both [a] and [r] are right

D

Both [a] and [r] are wrong

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11

2013 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2013

Condensation polymerization is not used to produce

A

Polyester

B

Nylon 6

C

Nylon 66

D

Polypropylene

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12

2013 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2013

Wet spinning technique is commercially used to produce filament yarn of

A

Polypropylene

B

Polyester

C

Nylon 66

D

Acrylic

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13

2013 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2013

Consider the following assertion [a] and reason [r] and choose the most appropriate answer
[a] Nylon 6 is polymerized using only single monomer caprolactum
[r] Synthesis of Nylon 6 is basically an addition polymerization

A

[a] is right [r] is wrong

B

[a] is right [r] is right

C

[a] is wrong [r] is wrong

D

[a] is wrong [r] is right

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14

2016 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2016

Which one of the following stereo structures of polypropylene is (are) used for commercial fibre manufacture?

A

Atactic

B

Syndiotactic

C

Isotactic & Syndiotactic

D

Isotactic

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15

2016 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2016

Acrylic fibre has high glass transition temperature ($T_g = 100^\circ C$) primarily due to

A

Presence of polar side groups

B

Presence of bulky side groups

C

High crystallinity

D

Main chain stiffness

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16

2016 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2016

Match the fibers listed in Column A with the compounds used in its manufacture listed in Column B. Choose the right answer from options A, B, C and D.

A

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

B

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

C

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

D

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

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17

2016 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2016

Consider the following assertion [a] and reason [r] and choose the correct alternative from amongst A, B, C and D.
[a] Both polyester and nylon filaments can be drawn at room temperature to achieve higher strength, modulus and dimensional stability.
[r] \(T_g\) of both polyester and nylon can be lowered to room temperature on absorption of atmospheric moisture.

A

[a] is right and [r] is wrong

B

[a] is right and [r] is right

C

[a] is wrong and [r] is wrong

D

[a] is wrong and [r] is right

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18

2016 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2016

Low pill PET fibers of a given denier can be produced by a combination of any two options listed below. Choose the right combination from A, B, C and D.
P. Lowering the \(IV\) (intrinsic viscosity) of the polymer
Q. Increasing the \(IV\) (intrinsic viscosity) of the polymer
R. Increasing the draw ratio
S. Decreasing the draw ratio

A

P, S

B

P, R

C

Q, S

D

Q, R

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19

2017 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2017

Which of the following fibre(s) is(are) manufactured by melt spinning process? P. Viscose Q. Cellulose acetate R. Nylon-6 S. Aramid

A

P only

B

Q and R only

C

R only

D

R and S only

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20

2017 · Textile Engineering & Fibre Science · Textile Fibres · Synthetic Fibres

Textile Engineering & Fibre Science (TF) 2017

Group I contains techniques of fibre manufacturing. Group II gives the physical phenomena associated with these techniques. Match the technique with the phenomenon

A

Group I	Group II
P. Melt spinning	1. Diffusion of only solvent
Q. Wet spinning	2. Diffusion of both solvent and non-solvent
R. Dry spinning	3. No solvent diffusion

B

P-1, Q-2, R-3

C

P-3, Q-1, R-2

D

P-3, Q-2, R-1

E

P-1, Q-3, R-2

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