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Rectifiers and Converters

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
With a motor converter it is possible to obtain D.C. voltage only upto

600-800 V
1700-2000 V
1000-1200 V
200-100 V

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

200 A
2000 A
500 A
1500 A

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Rectifiers and Converters
The metal rectifiers, as compared to mercury arc rectifiers

give poor regulation
operate on low temperatures
can operate on heavy loads
can operate on high voltages

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Rectifiers and Converters
The potential drop in the arc, in a mercury arc rectifier, varies

0.5 V to 1.5 V per cm length of the arc
none of the listed here
0.05 V to 0.2 V per cm length of the arc
2 V to 3.5 V per cm length of the arc

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Rectifiers and Converters
The cathdde voltage drop, in a mercury arc rectifier, is due to

expenditure of energy in ionization
expenditure of energy in liberating electrons from the mercury
surface resistance
expenditure of energy in overcoming the electrostatic field

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