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Which of the following is not a furnace used for heating?

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in Casting-Forming-Welding I by (687k points)
Which of the following is not a furnace used for heating?

(a) Cupola furnace

(b) Crucible furnace

(c) Electric arc furnace

(d) Blow air furnace

I had been asked this question by my school teacher while I was bunking the class.

This intriguing question comes from Heating and Pouring in chapter Preventive Maintenance in Foundries & Metal Casting Process of Casting-Forming-Welding I

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The correct choice is (d) Blow air furnace

To elaborate: Among the following, blow air furnace is not a type of furnace which is used for the heating purposes, whereas cupola, crucible and electric arc, are furnaces which are regularly used for heating.

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