GTU BE 2019 Summer Question Papers || Gujarat Technological University
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Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VI(NEW) —- EXAMINATION - SUMMER 2019 Seat No.:
Subject Code:2163603 Date:18/05/2019
Subject Name: Refractories-I
Time:10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| MARKS | ||
| Q.1 | (a) Define what is alumino silicates. | 03 |
| (b) Explain transformation toughening of zirconia bodies. | 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 different types of sintering. | 04 | |
| (c) Explain the phase diagram of Fe- Fe3C. | 07 | |
| 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 | |
| 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 |
| (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 | |
| (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 | ||
| 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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