The ignited or auxiliary anode in mercury arc rectifier is made of____________?
Correct answer: B. boron carbide
- A. graphite
- B. boron carbide
- C. aluminium
- D. copper
Explanation
The igniting or auxiliary anode is made of boron carbide because it withstands the mercury-arc operating conditions and does not readily amalgamate with mercury. Graphite is used for other electrode structures in many mercury-arc designs.
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