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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier characteristic blue luminosity is due to

high temperature
colour of mercury
electron streams
ionization

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Motor converter
Mercury arc rectifier
Rotary converter
Motor-generator set

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

60°C
25°C
40°C
75°C

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

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

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

Copper
Graphite
Boron carbide
Aluminium

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

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

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