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Rectifiers and Converters

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

Boron carbide
Aluminium
Copper
Graphite

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Rectifiers and Converters
In a rotary converter armature currents are

a.c. only
d.c. only
partly a.c. and partly d.c.
None of the listed here

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Rectifiers and Converters
The internal efficiency of a mercury arc rectifier depends on

current only
voltage and current
voltage only
r.m.s. value of current

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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

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

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

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

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Rectifiers and Converters
In a mercury arc rectifier______ flow from anode to cathode

electrons
ions and electrons
All of the listed here
ions

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