GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION - WINTER 2019
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Subject Code: 2173604 Date: 23/11/2019
Subject Name: Whitewares-I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Define tri axial body. 03
(b) Explain different types of sintering mechanism. 04
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(c) Define a whiteware body. Describe the role of feldspar in whitewares bodies. 07
Q.2 (a) Define nucleation and its types. 03
(b) Explain kinetic theory of glass formation. 04
(c) Explain nucleation phenomena. Explain difference between nucleation and growth. 07
OR
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(c) Write down what is jollying, jiggering and extrusion. 07
Q.3 (a) Describe synthesis of Sea water magnesia 03
(b) Explain the phase diagram of A203-SiO2 04
(c) Define flint. Explain different polymorphs of Barium Titanate 07
OR
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Q.3 (a) Define normal and inverse spinel. 03
(b) Describe the occurrences of chrome ore. 04
(c) Describe the structure of chrome ore in detail 07
Q.4 (a) What is natural magnesia? 03
(b) Define different types of Magnesia. 04
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(c) Describe occurrences of magnesia 07
OR
Q.4 (a) Define flux materials. 03
(b) Write down the role of flux in composition. 04
(c) Write down the role of wollastonite, nepheline syenite and feldspar as flux. 07
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Q.5 (a) Define R.U.L. 03
(b) Describe the difference between R.U.L. and Creep. 04
(c) Explain the role of silica, soda ash and alumina in soda lime silica glass 07
OR
Q.5 (a) What is meant by creep? 03
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(b) Explain enthalpy vs. temperature diagram of a glass forming melt. 04
(c) What are raw materials normally used in whiteware body making? 07
Explain the parameters for raw material selection
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