GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
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BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
Subject Code:3152111 Date:01/02/2021
Subject Name:Iron Making & Steel Making Technology
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Marks | |
| Q.1 (a) What is the reducing agent in the blast furnace? State the role | 03 |
| (b) Justify- Ironmaking and Steelmaking are totally opposite process. | 04 |
| (c) Describe evaluation of the iron ore. | 07 |
| Q.2 (a) Explain limitation of Corex process. | 03 |
| (b) Justify- The agglomeration of iron ore is necessary for iron making process in Blast furnace | 04 |
| (c) What is palletization? Explain disc pelletizer in detail with its parameters affecting palletization process. | 07 |
| Q.3 (a) Draw schematic diagram of L.D converter. | 03 |
| (b) Explain importance of slag formation during Iron reduction. | 04 |
| (c) Illustrate with figure Dead man’s zone & coke slit in blast furnace and explains it. | 07 |
| Q.4 (a) State the importance of RAFT. | 03 |
| (b) Differentiate between direct reduction & Indirect reduction in iron making process | 04 |
| (c) Explain AOD process: | 07 |
| Q.5 (a) What is the main hazardous thing in Steel Plant? | 03 |
| (b) A slag of CaO, SiO2 and Al2O3, having mole fraction of alumina as 0.095, has Si2O7 %, Al04 > anions. Calculate the slag composition. | 04 |
| (c) Explain the advantages and disadvantages of top and bottom blown processes. | 07 |
| Q.6 (a) Calculate the activation energy for viscosity for a liquid slag, whose viscosities are 11 and 3 kg.m™'.s ' at 1490 and 1590°C respectively. | 03 |
| (b) Explain DC Electric Arc Furnace. | 04 |
| (c) Justify-Phosphorus and sulphur can be lower down at same condition | 07 |
| Q.7 (a) Why lime used instead of limestone. | 03 |
| (b) A liquid slag has 55 wt. % CaO, 10 wt. % MgO, 20 wt. % SiO2, and 15 wt. % AL2O3. Calculate its sulphide capacity at 1910 K with the help of the following equation: Log Cs | 04 |
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| Given atomic masses of Ca, Mg, S1, Al and O are 40, 24, 28,27 & 16. | |
| Q.8 (a) With a neat sketch explain Ladle furnace operation. | 07 |
| (b) What do you mean by inclusion? What are the sources of inclusions? | 03 |
| (c) Compare EAF with oxygen steel making. | 04 |
| (d) Explain Reactions at Slag-metal interface. | 07 |
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