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There is no direct contact of flame and metal in which of the following type of furnace?

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There is no direct contact of flame and metal in which of the following type of furnace?

(a) Cupola

(b) Crucible

(c) Electric arc

(d) Induction

The question was asked in examination.

This question is from Furnaces for Melting in chapter Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Best answer
Correct option is (b) Crucible

Easy explanation: In Crucible furnace, metal is placed in a crucible of refractory material. The crucible is heated with electric resistance.

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