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Which of the following is the lowest part of the blast furnace?

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Which of the following is the lowest part of the blast furnace?

(a) Hearth

(b) Stack

(c) Throat

(d) Bosh

I have been asked this question during an interview for a job.

My query is from Ferrous Metals in division Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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Best answer
Correct option is (a) Hearth

The best explanation: Hearth is the lowest part of the blast furnace. It is also known as the crucible. This portion of the furnace is used to collect slag and molten iron.

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