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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

More
Remain same
None of the listed here
Less

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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
from A.C. side as induction motor
by means of a small auxiliary motor

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

Zinc
Copper
Load
Aluminium

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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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Rectifiers and Converters
A rotary converter operates at a

low power factor
None of the listed here
zero power factor
high power factor

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Rectifiers and Converters
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

75, 85
30, 60
40, 50
20, 30

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