Download GTU B.Tech 2020 Winter 5th Sem 3152111 Iron Making And Steel Making Technology Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152111 Iron Making And Steel Making Technology Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
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:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.



Marks
Q.1 (a) What is the reducing agent in the blast furnace? State the
03
role

(b) Justify- Ironmaking and Steelmaking are totally opposite
04
process.

(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
04
making process. in Blast furnace

(c) What is palletization? Explain disc pelletizer in detail with
07
its parameters affecting palletization process.




Q.3 (a) Draw schematic diagram of L.D converter.
03

(b) Explain importance of slag formation during Iron
04
reduction.

(c) Illustrate with figure Dead man's zone & coke slit in blast
07
furnace and explains it.




Q.4 (a) State the importance of RAFT.
03

(b) Differentiate between direct reduction & Indirect reduction
04
in iron making process

(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
04
alumina as 0.095, has Si2O7 6?, AlO4 5? anions. Calculate the
slag composition.

(c) Explain the advantages and disadvantages of top and
07
bottom blown processes.



Q.6 (a) Calculate the activation energy for viscosity for a liquid
03
slag, whose viscosities are 11 and 3 kg.m?1.s ?1 at 1490 and
1590?C respectively.

(b) Explain DC Electric Arc Furnace.
04

(c) Justify-Phosphorus and sulphur can be lower down at
07
same condition



Q.7 (a) Why lime used instead of limestone.
03

(b) A liquid slag has 55 wt. % CaO, 10 wt. % MgO, 20 wt. %
04
SiO2, and 15 wt. % Al2O3. Calculate its sulphide capacity
at 1910 K with the help of the following equation: Log Cs
1

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= 3.44 (Xcao + 0.1 XMgO ? 0.8 X Al203 ? X SiO2) ? 9894/T
+ 2.04.
Given atomic masses of Ca, Mg, Si, Al and O are 40, 24,
28, 27 & 16.

(c) With a neat sketch explain Ladle furnace operation.
07



Q.8 (a) What do you mean by inclusion? What are the sources of
03
inclusions?
(b) Compare EAF with oxygen steel making.
04
(c) Explain Reactions at Slag-metal interface.
07

2

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