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RECTIFIERS AND CONVERTERS

Rectifiers and Converters
In a mercury arc rectifier, the anode is usually made of

graphite
copper
silver
aluminium

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Rectifiers and Converters
Which of the following metals is generally manufactured by electrolysis process?

Aluminium
Load
Copper
Zinc

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

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

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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

tube is evacuated
anode is heated
low mercury vapour pressures are used
an auxiliary electrode is used

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Rectifiers and Converters
A synchronous converter can be started

from A.C. side as induction motor
All of the listed here
from D.C. side as D.C. motor
by means of a small auxiliary motor

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