GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Code: 2173615
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GUJARAT TECHNOLOGICAL UNIVERSITY
Date: 26/11/2019
Subject Name: New Functional dyes & Recent Trends in Dyes Technology
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 (a) | Give the synthesis of Solvent Yellow 14. | 03 |
| (b) | Discuss about functional dyes with respect to electromagnetic radiation. | 04 |
| (c) | What are metal complex dyes? Write down the role of metal. Give the properties and applications of metal complex dyes. | 07 |
| Q.2 (a) | Discuss the application of functional dyes in Photocopying. | 03 |
| (b) | Write a note on Dyes in Solar cells. | 04 |
| (c) | Discuss application of functional dyes in Ink-jet printing. | 07 |
| OR | ||
| (c) | Discuss in details dyes in Fluorescent Sensors and Probes. | 07 |
| Q.3 (a) | Write a note on natural hair dyes. | 03 |
| (b) | How do you synthesize Orange B and Food Red 9? | 04 |
| (c) | Give the structure of human hair and briefly explain traditional method of application of hair dyes. | 07 |
| OR | ||
| (c) | Discuss about dye-removal preparations. | 03 |
| Q.3 (a) | Give the two different methods for synthesis of food yellow 4. | 04 |
| (b) | Discuss the harmful effects of synthetic hair colours. | 07 |
| Q.4 (a) | Discuss the concept of Right First Time (RFT) dyeing technology. | 03 |
| (b) | Elaborate the term—Plasma. Give the difference between conventional dyeing-and plasma dyeing technology. | 04 |
| (c) | Explain the Dye sensitized solar cell (DSSC) with its working principle and operation in detail. | 07 |
| OR | ||
| (c) | Explain the following terms: --- Content provided by FirstRanker.com --- (1) % Rate of Exhaustion (ii) Strike Time | 03 |
| Q.4 (a) | Discuss the technology involved is based on solvents used in typical dyes synthesis reactions. | 07 |
| Q.5 (a) | Explain the electrochemical dyeing by considering its advantages, dyeing methods in detail. | 03 |
| (b) | Give the importance of Plasma Technology. | 04 |
| (c) | Explain the following terms: (1) % Fixation (ii) Equilibrium time | 07 |
| Q.5 (a) | Discuss the following qualitative control test: (1) Dye Hue Test (ii) Dye Strength Test (iii) Fixation Efficiency | 04 |
| OR | ||
| (b) | Write down the difference between conventional dyeing and supercritical dyeing technology. | 04 |
| (c) | Discuss the following quality control test with respect to future dye house : (1) Wash Fastness Test (i) Rubbing Fastness Test | 07 |
| Explain the yigwirirtR amkeicE St 2eneratiopyply cascade process of ionization with suitable diagrammatical representation. | ||
Total Marks: 70
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