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Mica manufactured by internal resistance melting method is melted at ______

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Mica manufactured by internal resistance melting method is melted at ______

(a) 1118^oC

(b) 1208^oC

(c) 1365^oC

(d) 1480^oC

This question was posed to me during an internship interview.

My question is based upon Insulating Materials in portion Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct option is (c) 1365^oC

To explain I would say: Mica is usually manufactured either as ruby mica or phlogopite mica. The synthetic mica is produced by internal resistance melting method. This method uses graphite electrodes and melts mica at 1365^oC.

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