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Rectifiers and Converters

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

silver
graphite
copper
aluminium

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

Boron carbide
Copper
Graphite
Aluminium

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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
To produce cathode spot in a mercury arc rectifier

anode is heated
tube is evacuated
an auxiliary electrode is used
low mercury vapour pressures are used

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Rectifiers and Converters
In a mercury pool rectifier, the voltage drop across its electrodes

is directly proportional to load
is inversely proportional to load
varies exponentially with the load current
is almost independent of load current

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

A synchronous motor
A D.C. series motor
An induction motor
A D.C. shunt motor

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