To produce cathode spot in a mercury arc rectifier______________?
Correct answer: C. an auxiliary electrode is used
- A. anode is heated
- B. tube is evacuated
- C. an auxiliary electrode is used
- D. low mercury vapour pressures are used
Explanation
An auxiliary electrode is used to initiate ionisation and establish the cathode spot in a mercury arc rectifier. Once the spot forms, the main arc can be sustained between the mercury cathode and the anode.
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