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Questions Provided by Solaiman Bin Ali(Lecturer, DoWPE, BUTEX)

N.B: Each Question Contains 1 Mark

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1. Which phenomena suits more for dyeing of cotton fabric with reactive dye?

At first, dye molecules adsorbed on the layer of the fabric surfaces and then start to entrapped
Initially, dyes are adsorbed on most accessible pores but due to presence of less accessible areas, further adsorption becomes difficult
Generally, dye particles show ionic characteristic when it has just added to the dye bath
Limited number of ionic sites of fiber ensured the proper dye-fiber reaction

2. If M:L ration is increased 1:8 to 1:15, what will be beneficial?

Proper exhaustion
Easier to dye at open bath
Environmental friendly dyeing
Easier to achieve shade

3. What is the function of caustic soda in case of dyeing of cotton with vat?

Reducing
Alkali reduction
Maintaining Solubilization
pH maintaining

4. Why does acidic media is requires for dyeing of polyester with disperse dye?

Stabilization of dye
Dye migration
Controlling the dispersing mechanism
Good colorfastness

5. Which colorants are suitable for protein fiber?

Acid, basic, disperse
Basic, acid, vat
Acid, pigment, direct
Direct, azoic, pigment

6. Why does reduction clearing require?

For good shade%
Uniform dyeing
Good colorfastness
Less damaging of dye

7. For vinyl sulphone recative dye, what does soda ash play role for dyeing?

Successful convert of dye into ionization
Higher exhaustion of dyes
Neutralization of fiber
Uniform adsorption

8. What is function of caustic at pretreatment of cotton fabric?

Wrapping up of impurities
Maintaining of alkali media
Breakdown of impurities
Removing impurities

9. Which option below does not suit process curve?

Dyeing rate
Cooling rate
After treatment’s temperature
Number of rinsing

10. What isn't the role “carrier” in polyester dyeing?

Lowering Tg
Promoting polymer chain movement
Fetching dye particles to the fiber
Creating free volume

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