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Rectifiers and Converters

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

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

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Rectifiers and Converters
A mercury arc rectifier possesses ________ regulation characteristics

straight line
exponential
none of the listed here
curved line

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Rectifiers and Converters
The efficiency of an electrolytic rectifier is nearly

50 %
40 %
60 %
70 %

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Rectifiers and Converters
In a mercury arc rectifier positive ions are attracted towards

shell bottom
cathode
anode
mercury pool

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

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

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Rectifiers and Converters
A synchronous converter can be started

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

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