Textile Coloration-I paper (WPE 301) from BUTEX affiliated colleges' 2020 Level-3 Term-I finals. Questions cover chromophore structures for azo and nitro groups, direct dye recipes, acid dyeing of wool, vatting, winch machines, and thickener preparation methods.
Level-3 Term-I, Final Exám-2020
Subject: Textile Coloration-I (Code: WPE 301)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) Define dyes and pigments. Write down the difference between dyes and pigments.
(b) Write short note on: (i) Chromophore (ii) Auxochrome (iii) Chromogen.
(c) Show the chemical structure of following chromophore group:
i) Azo ii) Indamine iii) Nitro iv) Quinone v) Azine.
[5+3+4=12]
2. (a) Why direct dyes are substantive? Explain.
(b) Discuss on the features of direct dyes.
(c) Briefly describe the process and recipe of cotton fabric dyeing with direct dyes.
[4+4+4=12]