Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
Correct answer: D. Graphite
- A. Fireclay
- B. Carborundum
- C. Chromite
- D. Graphite
Explanation
Graphite conducts electricity well because it has mobile electrons in its layered structure. Fireclay, carborundum, and chromite are comparatively poor electrical conductors in refractory service.
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