Rectifiers and Converters
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as

critical grid voltage
maximum grid voltage
non of the listed here
all of the listed here

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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?

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

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