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Which of the following is not a property of a crucible?

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Which of the following is not a property of a crucible?

(a) Retention of thermal conductivity

(b) Resistance to chemical attack

(c) Retention of electrical conductivity

(d) Resistance to erosion

I have been asked this question in class test.

This key question is from Crucibles topic in chapter Metal Furnace and Practice of Casting-Forming-Welding II

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The correct option is (c) Retention of electrical conductivity

For explanation: It is very necessary for the crucible to have retention of thermal conductivity, to possess resistance to chemical attacks and to erosion. But, there is no need for retention of electrical conductivity.

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