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Rectifiers and Converters

Rectifiers and Converters
In a glass bulb mercury arc rectifier the maximum current rating is restricted to

1500 A
200 A
2000 A
500 A

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Rectifiers and Converters
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of

Synchronous motor
Induction regulator
Synchronous generator
Shunt motor

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Rectifiers and Converters
The ignited or auxiliary anode in mercury arc rectifier is made of

Boron carbide
Aluminium
Graphite
Copper

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Rectifiers and Converters
In a mercury arc rectifier characteristic blue luminosity is due to

ionization
electron streams
high temperature
colour of mercury

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Rectifiers and Converters
Which of the following is reversible in action?

Rotary converter
All of the listed here
Motor generator set
Motor converter

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

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

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