Dyes, Pigments and Auxiliaries - Chemical Processing - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2007

Poly-condensation reaction typically occurs due to the presence of

A

One functional group

B

Two functional groups

C

Low temperature

D

Addition of a compound

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2

2007 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2007

The direct dyes, under the conditions of dyeing, are

A

Cationic

B

Anionic

C

Nonionic

D

Amphoteric

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3

2007 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2007

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

Group I	Group II
P   Optical brightening agent	1   Stilbene based compound
Q   Reducing agent	2   Cationic compound
R   Oxidizing agent	3   Sodium bisulfite
S   Dye Fixing agent	4   Sodium hypochlorite
	5   Sodium hydrosulfite
	6   Hydrogen peroxide

A

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

B

P-6, Q-3, R-4, S-1

C

P-2, Q-3, R-4, S-5

D

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

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4

2007 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2007

Ice colours are

A

Suitable for garments meant for Antarctica

B

Azoic colours

C

Triphenyl methane based dyes

D

Liquid crystalline colours which develop characteristic colour at temperatures below zero

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5

2008 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2008

In the context of application of spin finish to synthetic fibres, the INCORRECT statement among the following is

A

Spin finish dissipates static charge

B

Spin finish reduces fibre breakage in carding

C

Spin finish reduces the stiffness of the fibre

D

Spin finish reduces nep generation tendency in fibres

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6

2008 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2008

Which of the following is a suitable catalyst during polycondensation of PET

A

Triphenyl phosphite

B

Trisnonyl phenyl phosphite

C

Diphenyl terephthalate

D

Antimony trioxide

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7

2008 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2008

Consider the elements in Group I and Group II and choose the correct alternatives from amongst A,B,C and D

A

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

B

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

C

P-5, Q-6, R-4, S-2

D

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

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8

2009 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2009

Consider the fibres in Group I and the corresponding monomer(s) in Group II. Choose the correct combinations from amongst A, B, C and D.

Group I	Group II
P. Polyester (PET)	1. \(CH_2=CH.CN, CH_2=CH.COOCH_3\)
Q. Nylon 6	2. \(HO-(CH_2)_2-OH, HOOC-\bigcirc -COOH\)
R. Nylon 6,6	3. \(HOOC-(CH_2)_4-COOH, H_2N-(CH_2)_6-NH_2\)
S. Acrylic	4. \(HO-(CH_2)_6-OH, HOOC-\bigcirc -COOH\)
	5. \(HOOC-(CH_2)_4-COOH, H_2N-(CH_2)_6-NH_2\)
	6. \(H_2N-(CH_2)_5-COOH\)

A

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

B

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

C

P-2, Q-6, R-3, S-4

D

P-3, Q-2, R-5, S-1

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9

2010 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2010

A textile dye should have in its structure atleast

A

One azo and one reactive group

B

Two chromophores

C

One chromophore and one auxochrome

D

One solubilising and one reactive group

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10

2011 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2011

The byproduct obtained from polycondensation of diethylene glycol terephthalate (DGT) is

A

Glycolic acid

B

Water

C

Diethylene glycol

D

Ethylene glycol

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11

2011 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2011

Out of the following, the one which is NOT a surfactant is

A

Reducing agent

B

Wetting agent

C

Detergent

D

Dispersing agent

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12

2014 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2014

Consider the following assertion [a] and reason [r] and choose the most appropriate answer.
[a] In the case of condensation polymerization of PET, diethylene glycol terephthalate (DGT) is prepared first
[r] In condensation polymerization, it is important to have a correct stoichiometric balance of comonomers

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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13

2016 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2016

In which of the following polymerization methods the rate of reaction is very high and leads to uncontrolled polymerization?

A

Solution polymerization

B

Suspension polymerization

C

Bulk polymerization

D

Emulsion polymerization

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14

2016 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2016

The volume strength of 1 molar H₂O₂ solution will be __________

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15

2017 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2017

To obtain high molecular weight nylon-66, if 11.6 g of hexamethylene diamine (molecular weight 116 g/mol) is used, then the required amount of adipic acid (molecular weight 146 g/mol), in gram, accurate to one decimal place, is ________

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16

2018 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2018

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: As the concentration of a surfactant in water increases, the surface tension of water initially decreases and then becomes constant.

[r]: After reaching the Critical Micelle Concentration, additional surfactant molecules do not further reduce the surface tension.

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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17

2019 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2019

Match the process steps in viscose fibre manufacture listed in Group I with the corresponding chemicals given in Group II. The correct option is
Group I
P. Ageing
Q. Steeping
R. Xanthation
S. Wet spinning
Group II
1. Carbon disulphide
2. Zinc sulphate
3. Sodium hydroxide
4. Manganese salt

A

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

B

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

C

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

D

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

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18

2020 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2020

A Procion H (monochlorotriazine based) reactive dye used for printing of cotton has a molecular weight of 471. Taking the atomic weight of H=1, C=12, N=14, O=16, Cl=35.5, the molecular weight of the fully hydrolyzed dye (correct up to 1 decimal place) would be __________.

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19

2020 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2020

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]

[a]: Caprolactam is polymerized in the presence of small amount of water to produce fibre grade nylon 6.

[r]: Water acts as a catalyst and converts caprolactam to aminocaproic acid.

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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20

2020 · Textile Engineering & Fibre Science · Chemical Processing · Dyes, Pigments and Auxiliaries

Textile Engineering & Fibre Science (TF) 2020

In the production of PET, diglycol terephthalate (DGT) is an intermediate. Taking the atomic weights of H=1, C=12, O=16, the molecular weight of DGT is __________.

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