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Pick out the wrong statement. | |
A. | Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces. [Correct Answer] |
B. | Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators. [Wrong Answer] |
C. | Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity. [Wrong Answer] |
D. | Electrical conductivity of porous refractory material is low. [Wrong Answer] |