The electrode of a direct arc furnace is made of____________?
Correct answer: B. graphite
- A. tungsten
- B. graphite
- C. silver
- D. copper
Explanation
Graphite is used for direct-arc furnace electrodes because it conducts current and withstands the extremely high arc temperature. Copper and silver would melt, while tungsten is not the usual economical furnace-electrode material.
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