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Rectifiers and Converters

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

500 A
1500 A
2000 A
200 A

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

energy spent in overcoming the electrostatic field
high temperature inside the rectifier
self restoring property of mercury
high ionization potential

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Rectifiers and Converters
In a three-phase mercury arc rectifiers each anode conducts for

One-half a cycle
One-third of a cycle
Two-third of a cycle
One-fourth of a cycle

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

colour of mercury
ionization
electron streams
high temperature

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Rectifiers and Converters
If cathode and anode connections in a mercury arc rectifier are inter changed

Both ion and electron streams will move in the same direction
The rectifier will not operate
Internal losses will be reduced
The rectifier will operate at reduced efficiency

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Rectifiers and Converters
Which of the following AC. motors is usually used in large motor-generator sets?

Slip ring induction motor
Any of the listed here
Squirrel cage induction motor
Synchronous motor

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