Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018Subject Code: 2173614 Date: 19/11/2018
Subject Name: Refractories-II
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
Q.1 (a) Define on line purging. 03
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(b) Explain the oxidation process in LD converter during liquid steel making. 04
(c) Discuss the polymorphic transformation of silica. What is meant by refractoriness under load of a material? Explain 07
Q.2 (a) Describe what is flint. 03
(b) Explain why flint is called cryptocrystalline quartz. 04
(c) Explain the phase diagram of CaO- MgO. 07
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OR
(c) Explain the phase diagram of alumina & silica. 07
Q.3 (a) Explain the difference between nucleation and growth. 03
(b) Explain Growth phenomena. 04
(c) Explain the model of nucleation with mathematical derivation 07
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OR
Q.3 (a) What is bursting of magchrome bricks? 03
(b) What is secondary mullite formation? 04
(c) Write down the processing of synthesis of mag carbon bricks. 07
Q.4 (a) Describe the occurrences of chrome ore. 03
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(b) Define normal and inverse spinel. 04
(c) Define steel. Explain different types of steel. 07
OR
Q.4 (a) Why gamma alumina is called pseudo spinel? 03
(b) Discuss various types of alumina. 04
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(c) Describe synthesis of alumina by Bayer’s process. 07
Q.5 (a) What is sea water magnesia? 03
(b) Write various applications of alumina. 04
(c) Explain the role of silica, soda ash and alumina in soda lime silica glass. 07
OR
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Q.5 (a) Define aluminosilicates with examples. 03
(b) Describe occurrences of alumina. 04
(c) What are raw materials normally used in glass making? Explain the parameters for raw material selection. 07
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