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Rectifiers and Converters

Rectifiers and Converters
A rotary converter operates at a

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

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

Mechanical rectifiers
Copper oxide rectifiers
Selenium rectifiers
Electrolytic rectifiers

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

75°C
25°C
60°C
40°C

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Rectifiers and Converters
The metal rectifiers, as compared to mercury arc rectifiers

can operate on heavy loads
operate on low temperatures
can operate on high voltages
give poor regulation

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

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

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Rectifiers and Converters
Which of the following are the applications of D.C. system?

Battery charging work
Electrolytic and electro-chemical processes
All of the listed here
Arc welding

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