Download GTU BE/B.Tech 2018 Winter 7th Sem New 2173613 Specialty Pigments And Recent Development In Pigment Technology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

1. (a) What do you mean by flop index? 03
   (b) What is meant by special effect pigments? 04
   

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   (c) Define: (i) Refractive index (ii) Nano crystals (iii) Nanoparticles 07
2. (a) Define antifouling coating with reference to sustained chemical release? 03
   (b) Describe the phenomenon of fouling with two main types of underwater 04 antifouling coatings.
   (c) With suitable schematic representation, explain the mechanism of a 07 biocide based antifouling system.
   OR
   

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   (c) Discuss: The pigments used to formulate antifouling coatings. 07
3. (a) What are the variables which controls Pearl Effect? 03
   (b) Give the applications of the Nano materials. 04
   (c) Explain the Mica Pigment with respect to its chemical formula, properties 07 and its importance.
   OR
   

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   (a) Define: (i) Quantum dots (ii) CNTs (iii) Quantum wire 03
   (b) Explain the applications of Pearlescent Pigments? 04
   (c) Explain Jablonski Diagram with neat schematic. 07
4. (a) What is DOI? What is difference between DOI and Gloss? 03
   (b) What are the properties of Luminescent pigments? 04
   

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   (c) Give the classification scheme of effect pigments on the basis of opacity 07 or optical impression?
   OR
   (a) What is Flip Flop Effect? Explain with suitable example. 03
   (b) Establish the difference between: Leafing & Non leafing pigments 04
   (c) Explain the model used to explain the flake orientation with the help of 07 diagram

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5. (a) Explain the mechanism of corrosion with suitable schematic. 03
   (b) Write down the importance of anticorrosive pigments. 04
   (c) Discuss the barrier and active pigments in detail. 07
   OR
   (a) What are anti-corrosive pigments? What are the types of anti-corrosive 03 pigments?
   

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   (b) Explain the concept of thermochromism with suitable example. 04
   (c) Give the mechanism of passivation of Iron by chromate pigments? 07

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