Iron Making in Metallurgy MCQ Questions and Answers

1

purpose of flux in blast furnace

A) bring down the softening point of the gangue materials B) reduce the viscosity of the slag C) to maintain proper basicity D) all of these

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Answer & Solution

Answer: Option D

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2

High top pressure in the blast furnace

A) decreases the time of contact between gas and solid B) increases the time of contact between gas and solid C) increases fuel consumption D) increases the rate of solution loss reaction

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Answer & Solution

Answer: Option B

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3

Dephosphorisation of molten pig iron is favoured by

A) oxidising and basic slag B) reducing and basic slag C) high activity co-efficient of phosphorous in metal D) oxidising and neutral slag

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Answer & Solution

Answer: Option A

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4

High top pressure in a blast furnace operation

A) favours the solution loss reaction B) suppresses the solution loss reaction C) decreases gas-solid contact time D) increases coke rate

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Answer & Solution

Answer: Option B

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5

The zone where the entire charge is in semi-solid or in softened condition except coke inside the BF is called . . . . . . . . zone

A) stagnant coke zone B) active coke zone C) cohesive zone D) Tuyere zone

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Answer & Solution

Answer: Option C

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6

The primary source of heat in cupola melting is provided by the reaction:

A) C + O₂ ⟶ CO₂ B) C + H₂O ⟶ CO₂ + H₂ C) C + C₂O ⟶ 2CO D) CaCO₃ ⟶ CaO + CO₂

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Answer & Solution

Answer: Option A

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7

External desiliconisation of hot metal is carried out in the steel plant located at

A) Rourkela B) Durgapur C) Bokaro D) Bhilai

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Answer & Solution

Answer: Option B

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8

Humidification of the blast in the iron blast furnace leads to

A) lowering of the raceway temperature B) increase in the raceway temperature C) difficulty in pulverised coal injection D) decrease of oxygen content in the hot metal

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Answer & Solution

Answer: Option A

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9

High top pressure in blast furnace

A) increases the silicon content in the hot metal B) increases the sulfur content in the hot metal C) increases the phosphorous content in the hot metal D) increases the manganese content in the hot metal

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Answer & Solution

Answer: Option A

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10

The deadman's zone in the blast furnace consists of

A) closely packed central columm of coke, limestone and iron ore B) gases only C) closely packed central column of coke only D) column of hot metal and slag

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Answer & Solution

Answer: Option B

Solution:

The deadman's zone in a blast furnace refers to the central region at the bottom of the furnace where the burden materials slow down and become relatively stagnant.

This zone is composed primarily of a closely packed column of coke that remains largely stationary while the surrounding materials continue to descend.

The coke in this region supports the overlying burden and provides permeability for the upward flow of gases.

It is called the "deadman" because of its limited movement compared to other parts of the furnace burden.

Therefore, Option C is correct as the deadman zone consists mainly of coke only.

Iron Making in Metallurgy MCQ Questions and Answers | Metallurgical Engineering