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Why is sand bed prepared for melting of metal in Cupola furnace?

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Why is sand bed prepared for melting of metal in Cupola furnace?

(a) It provides a refractory bottom

(b) It soaks the moisture from the metal

(c) It conducts the heat faster and uniformly

(d) None of the mentioned

This question was addressed to me in an online quiz.

This intriguing question comes from Furnaces for Melting topic in division Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Best answer
Right choice is (a) It provides a refractory bottom

Easy explanation: A sand bed needs to be prepared because it provides a necessary refractory bottom for molten metal and coke.

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