Seat No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Code: 2173614
Subject Name: Refractories-II
Time: 10:30 AM TO 01:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Define on line purging. (03)
(b) Explain the oxidation process in LD converter during liquid steel making. (04)
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© Discuss the polymorphic transformation of silica. What is meant by refractoriness under load of a material? Explain (07)
Q.2 (a) Describe the structure of kaolinite. (03)
(b) Differ between biotite and muscovite. (04)
© Explain the phase diagram of Fe-Fe3C. (07)
OR
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© Explain the phase diagram of Calcia and Magnesia (07)
Q.3 (a) Explain the difference between nucleation and growth. (03)
(b) Explain Growth phenomena. (04)
© Explain the model of nucleation with mathematical derivation (07)
OR
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(a) What is bursting of magchrome bricks? (03)
(b) What is recrystallization and abnormal grain growth? (04)
© Write down the processing of synthesis of mag carbon bricks. (07)
Q.4 (a) Describe the occurrences of chrome ore. (03)
(b) Define normal and inverse spinel. (04)
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© Define steel. Explain different types of steel. (07)
OR
(a) Why gamma alumina is called pseudo spinel? (03)
(b) Discuss various types of alumina. (04)
© Describe synthesis of alumina by Bayer’s process. (07)
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Q.5 (a) What is sea water magnesia? (03)
(b) Write various applications of alumina. (04)
© Explain the role of silica, soda ash and alumina in soda lime silica glass. (07)
OR
(a) Define aluminosilicates with examples. (03)
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(b) Describe occurrences of alumina. (04)
© What are raw materials normally used in glass making? Explain the parameters for raw material selection. (07)
Date: 26/11/2019
Total Marks: 70
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