Pick out the wrong statement.

Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces

Answer

Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators

Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity

Electrical conductivity of porous refractory material is low

Answer: Option A

Answer: Option A

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