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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier positive ions are attracted towards

anode
cathode
mercury pool
shell bottom

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Rectifiers and Converters
The ignited or auxiliary anode in mercury arc rectifier is made of

Copper
Graphite
Aluminium
Boron carbide

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

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

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

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Rectifiers and Converters
Which of the following is reversible in action?

Rotary converter
All of the listed here
Motor converter
Motor generator set

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

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

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