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Rectifiers and Converters

Rectifiers and Converters
In which of the following applications, direct current is absolutely essential ?

Illumination
Electrolysis
Traction
Variable speed operation

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Rectifiers and Converters
In a single phase rotary converter the number of slip rings will be

Six
Two
Three
Four

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

high temperature
ionization
colour of mercury
electron streams

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Rectifiers and Converters
The potential drop in the arc, in a mercury arc rectifier, varies

0.05 V to 0.2 V per cm length of the arc
none of the listed here
0.5 V to 1.5 V per cm length of the arc
2 V to 3.5 V per cm length of the arc

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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
Which of the following are the applications of D.C. system?

Battery charging work
All of the listed here
Arc welding
Electrolytic and electro-chemical processes

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