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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

a.c. only
d.c. only
None of the listed here
partly a.c. and partly d.c.

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Rectifiers and Converters
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

none of the listed here
decelerates
any of the listed here
accelerates

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

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

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Rectifiers and Converters
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

Electrolytic rectifiers
Selenium rectifiers
Mechanical rectifiers
Copper oxide rectifiers

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

silver
copper
graphite
aluminium

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

Load
Copper
Zinc
Aluminium

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