Download GTU BE/B.Tech 2019 Winter 6th Sem New 2162304 Polymer Reaction Engineering And Rheology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019

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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) Differentiate between Elementary & Non Elementary reactions 03
   (b) Discuss about Maxwell model. 04
   

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   (c) With a neat sketch explain the Batch type Reactor. 07
2. (a) Discuss about Weissenberg effect. 03
   (b) Explain the cone & plate viscometer. 04
   (c) Explain in detail about Non Newtonian fluids giving suitable examples. 07

   OR

   (c) Explain Boltzmann superposition principle. 07

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3. (a) Discuss about creep curve of typical plastics. 03
   (b) Write a short note in Power Law model. 04
   (c) What is chemical kinetics? Give detailed classification of chemical reaction with suitable example. 07

   OR

   (a) What are stereo regular polymers? 03
   (b) Explain Die swell & Melt fracture of plastics. 04
   

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   (c) What is Tg & what are the factors affecting Tg of polymers. 07
4. (a) Explain about kinetics of free radical polymerisation. 03
   (b) Discuss about Kelvin & Voigt'model. 04
   (c) At 500 k the rate of bimolecular reaction is ten times then the rate at 400 k. Find the activation energy for this reaction a) From Arrhenius equation b) From Collision Theory. 07

   OR

   (a) What is molecularity & order of reaction. 03
   

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   (b) Derive Arrhenius equation. Give its significance. 04
   (c) Explain Melt flow index test with a neat diagram. 07
5. (a) On doubling the concentration of a reactant, the rate of reaction triples. Find out the reaction order. 03
   (b) Discuss about Continuous Stirred tank reactor. 04
   (c) Explain the factors affecting crystallinity of a polymer. 07

   OR

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   (a) Discuss about free volume concept. 03
   (b) Explain the Florry Huggins theory. 04
   (c) The pyrolysis of ethane proceeds with and activation energy of about 300kJ/m. How much faster is the decomposition at 650°c than at 500°c. Also discuss the rate constant. 07

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