Iron Making in Metallurgy MCQ Questions and Answers

31

Most of the phosphorous present in the blast furnace burden enters into

A) hot metal B) flue gases C) slag D) refractory lining

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Answer & Solution

Answer: Option A

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32

Coke bed height in a cupola is measured from the

A) level of slag hole B) bottom level C) level of tap hole D) level of tuyers

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Answer & Solution

Answer: Option D

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33

A hundred feet high blast furnace has hearth of internal diameter . . . . . . . . feet.

A) 15 B) 28 C) 40 D) 60

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Answer & Solution

Answer: Option B

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34

Basicity [defined as (%CaO + %MgO)/%SiO₂] of the slag in the indian blast furnaces is in the range of

A) 0.7 - 1.0 B) 1.1 - 1.4 C) 1.5 - 1.8 D) 2.0 - 2.5

Discuss

Answer & Solution

Answer: Option A

Solution:

In the context of iron making in metallurgy, basicity is defined as the ratio of the percentage of calcium oxide (%CaO) and magnesium oxide (%MgO) to the percentage of silicon dioxide (%SiO₂) in the slag.

The basicity of the slag is an important factor in the blast furnace process as it affects the melting point and fluidity of the slag, which, in turn, influences the efficiency of the iron-making process.

In Indian blast furnaces, the typical range of basicity is 0.7 to 1.0. This range ensures that the slag composition is suitable for the efficient extraction of iron from iron ore.

The other options do not accurately represent the typical basicity range for slag in Indian blast furnaces. Therefore, the correct answer is Option A: 0.7 - 1.0.

35

Why natural gas is not used directly as a reducing agent in Midrex process

A) due to very slow reduction B) due to carbon soot formation C) Both A and B D) provides very low temperature

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Answer & Solution

Answer: Option C

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36

Identify the correct statement with reference to blast furnace iron making.

A) Hematite is reduced to magnetite in the lower part of the shaft B) Coke rate can not be improved by oil injection through tuyere C) High exit gas temperature may be an indication of "channeling" D) Pressure drop in blast furnace can not be improved by proper burden distribution

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Answer & Solution

Answer: Option A

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37

Alkali metal oxide content in the blast furnace raw material

A) increases the strength of coke B) increases the reactivity of coke C) decreases the reactivity of coke D) neither affects the strength nor the reactivity of coke

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Answer & Solution

Answer: Option B

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38

Direct reduction of iron ore is possible in . . . . . . . .

A) blast furnace B) low shaft furnace C) electric reduction furnace D) cupola

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Answer & Solution

Answer: Option B

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39

Slag is not used as raw material for . . . . . . . . making

A) road B) cement C) ncement D) fertilizer

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Answer & Solution

Answer: Option C

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40

Temperature of blast furnace gas emanating from blast furnace is about . . . . . . . . degree C

A) 80 - 100 B) 200 - 250 C) 350 - 500 D) 650 - 750

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Answer & Solution

Answer: Option B

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Iron Making in Metallurgy MCQ Questions and Answers | Metallurgical Engineering