Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

an auxiliary electrode is used
anode is heated
low mercury vapour pressures are used
tube is evacuated

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Rectifiers and Converters
On which of the following factors the number of phases for which a rectifier should be designed depends?

The voltage regulation of the rectifier should be low
In the output circuit there should be no harmonics
All of the listed here
The power factor of the system should be high

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