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RECTIFIERS AND CONVERTERS

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
The efficiency of the copper oxide rectifier seldom exceeds

65 to 75%
85 to 90%
90 to 95%
80 to 85%

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

Remain same
More
Less
None of the listed here

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

200 A
1500 A
500 A
2000 A

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Rectifiers and Converters
The applications of selenium rectifiers are usually limited to potential of

20 V
100 V
10 V
30 V

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