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JNTU B.Tech III IRON PRODUCTION Previous Question Paper (November/December - 2017 - R13)

B.Tech | III | I | R13 | November/December - 2017

Answer PaperPaper Code: 115BJMaximum Marks: 75Time: 3 hours

Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.

Part A

125 marks
a
Write a short note on principles of iron making.
2 marks

Answer

Iron making is primarily based on the carbothermic reduction of iron oxides. The process involves the removal of oxygen from iron-bearing ores using carbon (coke) and carbon monoxide as reducing agents at high temperatures, typically within a blast furnace, to produce molten pig iron.

b
Write a short on theory of palletization.
3 marks

Answer

Pelletization is an agglomeration process that converts fine iron ore concentrates into spherical balls of uniform size. The theory relies on capillary forces and the presence of a binder (like bentonite) to hold particles together during balling, followed by high-temperature induration (firing) to develop sufficient mechanical strength for blast furnace charging.

c
Discuss the functions of coke in a blast furnace.
2 marks

Answer

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d
List down the various modes of cooling arrangements used in blast furnace.
3 marks

Answer

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e
How the chemical factors affecting the reduction of ores.
2 marks

Answer

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f
Write a short note on the blast furnace reactions.
3 marks

Answer

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g
Write a short note on degree of metallization.
2 marks

Answer

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h
Write a short note on percentage reduction.
3 marks

Answer

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i
What are the disadvantages of COREX process?
2 marks

Answer

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j
Write a short note on ELRED process of smelt reduction.
3 marks

Answer

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Part B

210 marks
a
What factors affect reducibility of iron ores? Discuss them.
5 marks

Answer

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b
How iron and steel was manufactured in India? Explain in detail.
5 marks

Answer

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OR
310 marks
a
Discuss about direct and indirect reduction of iron ores.
5 marks

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b
What are parameters, which affect the efficiency of the sintering machines? Explain.
5 marks

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410 marks
a
Explain under what conditions of blast furnace burdening external desiliconisation is accomplished.
5 marks

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b
Briefly discuss about the lining in blast furnace with reasons.
5 marks

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OR
510 marks
a
Describe how the high temperature required for the reduction of iron ore is generated inside blast furnace.
5 marks

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b
What are the chief causes of blast furnace refractory failure? Explain.
5 marks

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610 marks
a
What are the basic functions of the slag in a modern blast furnace?
5 marks

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b
What are the effects of CaO, SiO2, Al2O3 and MgO on fluidity of slags?
5 marks

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OR
7

An iron blast furnace smelts the following ore: 77% Fe2O3, 3% MnO, 3% P2O5, 11% SiO2, 4% Al2O3 and 2% of H2O. Coke is of 90% C, 9% SiO2 and 1% H2O and 1200 Kg of coke is used per ton of ore. The flux (100% CaCO3) amounts to 860 Kg per ton of pig iron made. The blast furnace gas carries 2.5 parts of CO to 1 part of CO2. The furnace reduces all the Fe2O3 to metal and 9/10 of MnO all of the P2O5 and 1/5 of SiO2. The pig iron contains 4% C. Calculate:

  • Amount of pig iron made from 1 ton of ore.
  • Amount of slag made per ton of iron.
  • Amount of blast used per ton of iron.
  • Quantity of blast furnace gas made per ton of pig iron.
10 marks

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810 marks
a
What are the latest developments in bell construction and operation in the modern blast furnace?
5 marks

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b
What is the importance of fuel injection in the recent trends of blast furnace?
5 marks

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OR
910 marks
a
Explain the Kiln Krupp-Renn process of sponge iron production and what are its advantages.
5 marks

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b
Explain the advantages and disadvantages of HYL process of sponge iron production.
5 marks

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1010 marks
a
Compare plasma smelting process and COREX process.
4 marks

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b
Classify the smelt reduction processes.
3 marks

Answer

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c
What are the advantages of smelt reduction process?
3 marks

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OR
1110 marks
a
Write a short note on (i) INRED process (ii) Plasma smelting.
5 marks

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b
Explain the operation principle of ELRED process.
5 marks

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About this paper

This page contains the question paper of IRON PRODUCTION from JNTU for B.Tech MME-MMT III I, November/December - 2017, R13.

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