GATE MT Iron and steel making PYQs & Answers — Page 2

Questions 11–20 of 22. Imported answers require independent review unless marked reviewed.

Identify the INCORRECT statement(s)

Your answerSelect all correct options. You can choose more than one.

Calcination is typically exothermic and roasting is usually endothermic.

Coking of coal is carried out in a shaft furnace.

The aims of extractive metallurgy processing are separation, compound formation, metal production, and metal purification.

The secondary steelmaking offers steel cleanliness, composition adjustments, and temperature adjustments.

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Magnesium treatment is carried out to produce __________ cast iron.

Your answerChoose one option.

white

gray

spheroidal graphite

malleable

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Which one of the following modern practices is used for retarding the solution loss reaction in blast furnace ironmaking?

Your answerChoose one option.

High top pressure

Bell-less top

Pulverized coal injection

Rotating chute for burden distribution

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Match the terms (in Column I) with the unit process (in Column II)

Column I Column II (P) Submerged Entry Nozzle 1. Ladle Furnace (Q) Electric Heating 2. Continuous Casting (R) Raceway Zone 3. LD Converter (S) Oxygen Lancing 4. Blast Furnace

Your answerChoose one option.

P–2, Q–1, R–4, S–3

P–4, Q–1, R–2, S–3

P–4, Q–3, R–1, S–2

P–2, Q–3, R–4, S–1

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A blast furnace uses hematite ore with 80% Fe₂O₃ and 20% gangue materials. It uses 600 kg coke per ton of hot metal. The coke contains 85% C and 15% ash. The composition of hot metal is 95.5% Fe and 4.5% C. The weight of iron ore used and slag produced per ton of hot metal respectively, are: Given: Atomic weight: O = 16, C = 12, N = 14, Fe = 56 All the compositions are in wt.%. 1 ton = 1000 kg Assume that the gangue materials of the ore and ash content of coke form slag while Fe₂O₃ in the ore is consumed in making hot metal.

Your answerChoose one option.

705 kg, 431 kg

2131 kg, 546 kg

705 kg, 331 kg

1500 kg, 431 kg

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Cupola is a furnace used to produce

Your answerChoose one option.

cast irons.

plain carbon steels.

copper alloys.

aluminum alloys.

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Match the processes in Column I with the most appropriate mechanisms in Column II.

Column I (P) Blast furnace iron making process (Q) Hall-Heroult's process (R) Basic oxygen furnace steel making process (S) Kroll's process

Column II

Metallothermic reduction

Oxidation

Carbothermic reduction

Fused salt electrolysis

Your answerChoose one option.

P-1, Q-4, R-2, S-3

P-3, Q-1, R-2, S-4

P-3, Q-4, R-2, S-1

P-1, Q-2, R-3, S-4

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The Boudouard (or, carbon gasification) reaction is ____________.

Your answerChoose one option.

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Match the reactors / refining sites in Column I with the corresponding refining process in Column II.

Column I: Reactors / refining sites (P) Blast furnace runner (Q) AOD (R) Torpedo car (S) BOF

Column II: Refining processes

De-carburization

External De-sulfurization

De-phosphorization

External De-siliconization

Your answerChoose one option.

P-4, Q-1, R-2, S-3

P-4, Q-2, R-3, S-1

P-2, Q-1, R-4, S-3

P-1, Q-3, R-2, S-4

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A blast furnace charged with hematite containing 90 wt.% Fe

produces liquid iron with 3.6 wt.% carbon. Coke containing 90 wt.% carbon is charged at a rate of 500 kg per Metric ton of liquid iron produced. The blast furnace top gas contains (by volume), 22% CO, 18% CO

, and balance nitrogen. The volume of the blast furnace top gas [in m

(NP), rounded off to the nearest integer] is ________.

Given: Assume ideal gas behavior, and molar volume of the gas at NP is 22.4 liter.

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GATE MT Iron and steel making PYQs

Question 49

Question 14

Question 25

Question 35

Question 36

Question 18

Question 32

Question 12

Question 26

Question 45