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What is the minimum capacity of an air furnace?

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in Casting-Forming-Welding II by (119k points)
What is the minimum capacity of an air furnace?

(a) 5 tons

(b) 7 tons

(c) 9 tons

(d) 11 tons

The question was posed to me by my college professor while I was bunking the class.

This question is from Reverberatory Furnace in portion Metal Furnace and Practice of Casting-Forming-Welding II

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The correct choice is (a) 5 tons

To explain I would say: Reverberatory furnace is used for the production of malleable iron and gray iron castings. The minimum capacity of an air furnace or a reverberatory furnace is around 5 tons.

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