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Rectifiers and Converters

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

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

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Rectifiers and Converters
When a rectifier is loaded which of the following voltage drops take place ?

Arc voltage drop
All of the listed here
Voltage drop in transformer reactance
Voltage drop in resistance of transformer and smoothing chokes

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

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

Selenium rectifiers
Copper oxide rectifiers
Electrolytic rectifiers
Mechanical rectifiers

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Rectifiers and Converters
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

anode drop and arc drop
cathode drop and arc drop
anode drop and cathode drop
anode drop, cathode drop and arc drop

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

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

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