MCQs of Textile Dyeing|| Multiple Choice Questions and Answers of Textile Dyeing and Coloration

This article contains multiple-choice questions (MCQs) and answers on textile dyeing, which will be useful for textile students, graduates and industry professionals. This article will cover the MCQs of all general classes of dyes, their dyeing mechanism and their application on fabric. The answer keys of MCQs are also attached to this article. 

1. Polyester fibre is produced by the chemical reaction of  _______ and Ethylene glycol.

Acetic acid

Terephthalic acid

Sulphuric Acid

HCL

2. The Three Basic colours are Red, Green and  ______.

Purple

White

Blue

Black

3. The ______chemical is required for the causticization of polyester fabric.

H2SO4

NaOH

CH3COOH

NaOCL

4. What type of singeing position is used to singe polyester fabric?

On free guided fabric

On water-cooled roller

Tangential singeing

None of them

5. The polyester fiber is __________fiber?

Hygroscopic

Elastic

Hydrophobic

None of these

6. The natural attraction of dye towards fibre/substrate is called_______.

Affinity

Diffusion

Retardation

None of them

7. In _____heating mechanism, the heat is transferred to other body with the help of hot air.

Conduction

Convection

IR Heating

None of them

8. A carrier is an organic compound which acts as a _______ for polyester fabric dyeing.

Buffer solution

Dispersing agent

Swelling agent

Bleaching agent

9. The Reduction clearing of polyester fabric after dyeing is carried out by using___chemical.

Sodium dithionite

Acetic acid

Hydrogen peroxide

Formic acid

10. Heat setting of polyester fabric done to improve the ________.

Fabric Strength

Surface appearance

Dimensional stability

Water absorbency

11. Which pretreatment process is not carried out for 100% cotton knitted fabric?

Singeing

Bleaching

Desizing

Scouring

12. The process in which the wool acid dyes make complex formations with metals is called_.

Chlorination

Mordanting

diazotization

None of them

13. Indigo rope dyeing of yarn is used for the manufacturing of _____fabric.

Woven fabric

Denim fabric

Knitted fabric

None of them

14. In the slasher dyeing process of denim fabric the yarn is dyed in the form of _____.

Yarn sheet

Yarn rope

Yarn cone

None of them

15. The cotton knitted fabric is dyed with reactive dye in _____form.

Open width form

Rope form

Bothe of them

None of them

16. The two main raw materials of polyester fibre are _______ and Terephthalic acid.

Acetic acid

Benzyl chloride

Ethylene glycol

Sulphuric acid

17. The glass transition temperature of polyester fiber is__________.

10-18°C

23-35°C

67-81°C

97-119°C

18. Which machine is used for the heat setting of polyester fabric?

Stenter

Winch

Pad steam range

Jigger

19. The _______ temperature is used for the heat setting of polyester fabric.

30-60°C

90-110°C

190-210°C

300-320°C

20. The process in which the luster appearance of polyester fabric is improved by peeling off the surface with the help of NaOH is called________.

Mercerization

Causticization

Ammonia treatment

None of them

21. In ______heating mechanism, the heat is transferred to other body with the help of contact with a hot surface.

Conduction

Convection

IR Heating

None of them

22. The ________dyes are produced in fabric by a chemical reaction between coupling compound and diazo compound.

Reactive dye

Azoic dyes

Vat dyes

Acid dyes

23. Substantivity of naphthol in azoic dyes can be increased by adding______.

Acetic Acid

Electrolyte

Sequestering agent

Sodium hydroxide

24. In the diazotization process of azoic dyes, aromatic amine reacts with _____to form a             solution of diazonium chloride in the presence of HCL.

Sodium nitrite

Sodium dithionite

Sodium hydroxide

None of them

25. In which dyeing process the Tailing dyeing fault appear?

Exhaust dyeing

Semi-Continuous

Continuous dyeing

None of them

26.  Acid dyes are used for__________fiber.

Cellulosic

Polyester

Protein fibers

Viscose rayon

27. The wool fiber is amphoteric in nature due to which wool contains______charge.

Positive

Negative

Bothe of them

None of them

28. Vat dyes are water ______ dyes.

Insoluble

Soluble

Both of them

None of them

29. The reduction of vat dyes is carried out by using_____________.

Sodium hydrosulphite

Hydrogen peroxide

Sodium nitrite

Sodium chloride

30.  There are _____classes of wool dyes according to dyeing characteristics.

One

Two

Three

Four

31. The ________acid is used in the dye bath of level acid dyes.

Acetic acid

Sulphuric acid

Formic acid

HCL

32. The washing fastness of level acid dyes are ______than super milling acid dyes.

Higher

Equal

Lower

None of them

33. Winch dyeing machine is used for dyeing of fabric in ______form.

Open width form

Rope form

Tubular form

None of them

34. The substantivity of level acid dyes is ______than super milling acid dyes.

Lower

Higher

Equal

None of them

35. For the identification of direct dyes on cellulosic fiber the dyed fabric is treated with_____.

NH4OH

Acetic acid

Tannic acid

NaOH

36. The Singeing process is performed by which technique?

Chemical

Mechanical

Both a & b

Enzyme

37. How many parts of azo colors?

One

Two

Three

four

38. What is the name of chromophore of azoic dye?

Diazo

Salt

Base

Triazo

39. How many Chemical reactions in azoic dyeing?

One

Two

Three

Four

40. Which chemical is used for the stripping of azo dye?

NaOH

Na2S2O4

Soda Ash

HCL

41. In which dyeing acid medium is used?

Direct Dyeing

Reactive Dyeing

Vat Dyeing

Acid Dyeing

42. In which dyeing acid medium is used?

Direct Dyeing

Reactive Dyeing

Sulphur Dyeing

Disperse dyeing

43. Which of the following dyes are insoluble in water?

Direct

Reactive

Vat

None of these

44. Vat dyes dissolve with?

H2O2

NaOH

HCL

H2SO4

45. Oxidation of vat dyes done with?

HCL

H2O2

NaOH

None of these

46. H2SO4 is used to dissolve?

Polyester

Silk

Cotton

Wool

47. A pad steam machine is used for dyeing of;

Polyester

Cotton

Yarn

Wool

48. Thermosol Machine is;

Low Temp

High Temp.

Normal Temp.

None of these

49. Metacreasol is used to dissolve;

Polyester

Wool

Cotton

Silk

50. Woven Fabric is dyed on?

Jigger

Winch

Kier

None of these

Author:

Engr. Muhammad Usman Ashraf

HOD Textile Department at TEVTA Punjab, Pakistan

M.Sc Textile Engineering (NTU, Faisalabad)

Email: usmanashraf884@gmail.com