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Rectifiers and Converters

Rectifiers and Converters
The ionization potential of mercury is approximately

16.4 V
5.4 V
None of the listed here
10.4 V

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Rectifiers and Converters
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

None of the listed here
Both of the listed here
They are mechanically strong
They do not require any voltage for filament heating

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Rectifiers and Converters
Which of the following mercury arc rectifier will deliver least undulating current?

Three-phase
Two-phase
Six-phase
Single-phase

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Rectifiers and Converters
Ageing of a selenium rectifier may change the output voltage by

25 to 30 per cent
None of the listed here
15 to 20 per cent
5 to 10 per cent

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Rectifiers and Converters
The advantage of mercury arc rectifier is that

it has high efficiency
it is comparatively noiseless
it is light in weight and occupies small floor space
All of the listed here

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Rectifiers and Converters
In a single phase rotary converter the number of slip rings will be

Six
Four
Two
Three

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