Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its atomic weight is quite high
All of the listed here
Its boiling point and specific heat are low
Its ionization potential is relatively low

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

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