Textile Coloration-II exam (WPE 401) from the 2021 Level-4 Term-I finals at BUTEX affiliated colleges. Questions address free volume diffusion, dye aggregation prevention, exhaustion-time relationships, sulphur dyeing in rope machines, and pigment surface dyeing.
Level-4 Term-I, Final Exám-2021
Subject: Textile Coloration-II (Code: WPE 401)
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) What is diffusion? Explain the Free Volume model of Diffusion.
(b) Define dye aggregation? Write down the reasons and prevention of dye aggregation in dye bath.
(c) What is absorption isotherms?
[5+6+1 = 12]
2. (a) What is dye bath exhaustion? Show that “Dye bath exhaustion is a function of time at a constant temperature” with proper graph.
(b) Throw light on the pore model of diffusion.
(c) What are diffusion and diffusion coefficient?
[3+5+4 = 12]
3. (a) Briefly discuss on the three transport zones of dye transport mechanism.