In a mercury arc rectifier, the anode is usually made of_____________?
Correct answer: D. graphite
- A. copper
- B. aluminium
- C. silver
- D. graphite
- E. tungsten
Explanation
In a mercury-arc rectifier, the pool of mercury acts as the cathode, while graphite electrodes are commonly used as the anodes. Tungsten is associated with some vacuum-tube electrode applications, not the usual anode here.
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