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What is typically the diameter of a direct arc furnace?

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in Casting-Forming-Welding II by (119k points)
What is typically the diameter of a direct arc furnace?

(a) Up to 5m

(b) Up to 6m

(c) Up to 7m

(d) Up to 8m

This question was addressed to me by my college professor while I was bunking the class.

Asked question is from Direct Arc Furnace in portion Metal Furnace and Practice of Casting-Forming-Welding II

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The correct answer is (b) Up to 6m

For explanation I would say: The direct arc furnace is widely used in the steel foundries for remelting steels of various compositions. In general, the diameter of a direct arc furnace is found to be only up to 6 meters.

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