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Rectifiers and Converters

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

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

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

All of the listed here
ions and electrons
ions
electrons

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Rectifiers and Converters
Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of

400 A at 400 V
300 A at 300 V
100 A at 100 V
500 A at 500 V

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

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

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Rectifiers and Converters
The cathdde voltage drop, in a mercury arc rectifier, is due to

surface resistance
expenditure of energy in overcoming the electrostatic field
expenditure of energy in ionization
expenditure of energy in liberating electrons from the mercury

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Rectifiers and Converters
The voltage drop at anode, in a mercury arc rectifier is due to

self restoring property of mercury
high ionization potential
energy spent in overcoming the electrostatic field
high temperature inside the rectifier

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