Download GTU B.Tech 2020 Winter 7th Sem 2172312 Additives And Compounding Of Plastics Question Paper

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Subject Code:2172312

GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION — WINTER 2020
Subject Name: Additives and Compounding of Plastics
Time: 10:30 AM TO 12:30 PM

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Instructions:

1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.

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3. Figures to the right indicate full marks.

1. Q.1
   1. What are Additives? List the types of Additives used in Plastics. 03
   2. Define the term Fillers. Give functions and classification of Fillers 04
   3. Explain Selection Criteria for Additives used in Plastics. 07

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2. Q.2
   1. What are Plasticizers? Why and which Plasticizer used in PVC? 03
   2. Describe Flame Retardants Additives with their examples in detail. 04
   3. Give types of Lubricants. What is the purpose of a Mold Release Agent? 07
3. Q.3
   1. Write short note on : Chemical and Physical Blowing Agents 03

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   2. What are the differences between Dyes and Pigments used as Additives? 04
   3. State the function and examples of Impact Modifiers used in Plastics. 07
4. Q.4
   1. Write short note on: Conductive Fillers. 03
   2. Define the term Compounding. State the reasons for Plastics Compounding. 04

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   3. Describe Theories of Mixing. 07
5. Q.5
   1. Enlist the technological requirements of Additives. 03
   2. What is a Nucleating Agent? Give its examples. 04
   3. Explain Distributive and Dispersive mixing. 07

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6. Q.6
   1. Write down the compounding process of plastics by Planetary Mixer. 03
   2. Give details on the various steps of compounding of Plastics. 04
   3. Explain the working of a High Speed Mixer used for compounding with the help of a neat diagram. 07

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7. Q.7
   1. Explain types of Twin Screw Extruders. 03
   2. Write the uses of Plastics in Electronics and Medical industries with examples. 04
   3. Explain the Banbury Mixture with a neat diagram as compounding equipment. 07
8. Q.8
   1. Write down the uses of Plastics in Packaging and Agriculture with examples. 03

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   2. Describe the functions of Ribbon Blender used for the compounding of Plastics. 04
   3. Give a neat sketch of a Compounder Extruder, and explain its working in detail. 07

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