Download GTU BE/B.Tech 2017 Winter 7th Sem New 2173604 Whitewares I Department Elective Vii Question Paper

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Subject Code: 2173604

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define sintering. [03]

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   2. Explain different types of sintering mechanism. [04]
   3. Define a whiteware body. Describe the role of feldspar in whitewares bodies. [07]
2. 1. Define nucleation and its types. [03]
   2. Explain the model of homogeneous nucleation with mathematical derivation. [04]

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   3. Explain nucleation phenomena. Explain difference between nucleation and growth. [07]

   OR

   1. Write down what is jollying, jiggering and extrusion. [07]
3. 1. Describe synthesis of Sea water magnesia [03]

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   2. Explain the phase diagram of Al₂O₃-SiO₂ [04]
   3. Define flint. Explain different polymorphs of Barium Titanate [07]

   OR

   1. Define normal and inverse spinel. [03]
   2. Describe the occurrences of chrome ore. [04]

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   3. Describe the structure of chrome ore in detail [07]
4. 1. What is natural magnesia? [03]
   2. Define different types of Magnesia. [04]
   3. Describe occurrences of magnesia [07]

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   OR

   1. Define flux materials. [03]
   2. Write down the role of flux in composition. [04]
   3. Write down the role of wollastonite, nepheline syenite and feldspar as flux. [07]

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5. 1. Define R.U.L. [03]
   2. Describe the difference between R.U.L. and Creep. [04]
   3. Explain the role of silica, soda ash and alumina in soda lime silica glass [07]

   OR

   1. What is meant by creep? [03]

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   2. Explain enthalpy vs. temperature diagram of a glass forming melt. [04]
   3. What are raw materials normally used in whiteware body making? Explain the parameters for raw material selection [07]