Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2152108 Steel Making Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2152108 Date: 17/06/2019
Subject Name:Steel Making
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Name various integrated and mini steel plants in India. 03
(b) Draw flow sheet showing different routes of steel making. 04
(c) Explain the types of slags and their effect at slag-metal interface. 07
Q.2 (a) Multiple Choice Questions:
1) Blowing of oxygen under vacuum is the technique used to
produce,
a. High carbon steel
b. Low carbon steel
c. Medium carbon steel
d. Ultralow carbon steel
2) The exit gas generated during blowing is rich in,
a. O2
b. SO2
c. CO
d. CO2
3) During steel casting, the steelmaking ladle is emptied
through a valve in the bottom of the ladle; as the ladle
gradually empties, the ladle top slag coats and solidifies on
the side walls of the ladle, and remains there once the ladle
is empty. This is termed as,
a. Steel making
b. Steel glazing
c. Steel brazing
d. Galvanizing
03
(b) Explain the reaction equilibria for reaction of carbon 04
(c) Explain the mechanism and importance of Decarburization
reaction?
07
OR
(c) Explain the conditions during which, desulphurisation &
dephosphorisation can be done from hot metal during steel making
operation. Explain briefly.
07
Q.3 (a) Briefly explain the refractory lining used in BOF. 03
(b) Compare and contrast top blown processes and bottom blown
processes.
04
(c) Explain the construction of Oxygen Lance. What are the
advantages and disadvantages of single and multi nozzle lance?
07
OR
Q.3 (a) Enlist the sequential operation of electric arc furnace (EAF). 03
(b) Explain the effects of ladle stirring and its advantages. 04
(c) List design improvements in modern EAF practice. Discuss
briefly about UHP arc furnaces.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2152108 Date: 17/06/2019
Subject Name:Steel Making
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Name various integrated and mini steel plants in India. 03
(b) Draw flow sheet showing different routes of steel making. 04
(c) Explain the types of slags and their effect at slag-metal interface. 07
Q.2 (a) Multiple Choice Questions:
1) Blowing of oxygen under vacuum is the technique used to
produce,
a. High carbon steel
b. Low carbon steel
c. Medium carbon steel
d. Ultralow carbon steel
2) The exit gas generated during blowing is rich in,
a. O2
b. SO2
c. CO
d. CO2
3) During steel casting, the steelmaking ladle is emptied
through a valve in the bottom of the ladle; as the ladle
gradually empties, the ladle top slag coats and solidifies on
the side walls of the ladle, and remains there once the ladle
is empty. This is termed as,
a. Steel making
b. Steel glazing
c. Steel brazing
d. Galvanizing
03
(b) Explain the reaction equilibria for reaction of carbon 04
(c) Explain the mechanism and importance of Decarburization
reaction?
07
OR
(c) Explain the conditions during which, desulphurisation &
dephosphorisation can be done from hot metal during steel making
operation. Explain briefly.
07
Q.3 (a) Briefly explain the refractory lining used in BOF. 03
(b) Compare and contrast top blown processes and bottom blown
processes.
04
(c) Explain the construction of Oxygen Lance. What are the
advantages and disadvantages of single and multi nozzle lance?
07
OR
Q.3 (a) Enlist the sequential operation of electric arc furnace (EAF). 03
(b) Explain the effects of ladle stirring and its advantages. 04
(c) List design improvements in modern EAF practice. Discuss
briefly about UHP arc furnaces.
07
2
Q.4 (a) Discuss the main requirements of deoxidizer in steel making. 03
(b) What are the sources of inclusion and briefly explain the types of
inclusions present in steel.
04
(c) Explain with neat schematic diagram ladle injection metallurgy. 07
OR
Q.4 (a) What are the objectives behind secondary steel making? 03
(b) Explain R-H degasser with the help of a schematic. 04
(c) Describe VOD process of steel treatment in detail. 07
Q.5 (a) What is the need for cleanliness assessment? 03
(b) What are the gases which are picked up during steel making?
Explain any one in detail.
04
(c) Briefly explain double slag and foamy slag practice for EAF. 07
OR
Q.5 (a) Explain briefly about methods to prevent re-oxidation during steel
casting.
03
(b) Explain the types of moulds used in continuous casting. 04
(c) What is continuous casting? Explain vertical continuous caster in
detail.
07
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This post was last modified on 20 February 2020