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Rectifiers and Converters

Rectifiers and Converters
A mercury arc rectifier possesses ________ regulation characteristics

exponential
curved line
none of the listed here
straight line

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Rectifiers and Converters
Which of the following methods may be used to convert A.C. system to D.C.?

All of the listed here
Rotary converters
Motor converters
Rectifiers

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

0.5 V to 1.5 V per cm length of the arc
none of the listed here
0.05 V to 0.2 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
In a mercury arc rectifier positive ions are attracted towards

mercury pool
anode
shell bottom
cathode

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

high temperature
colour of mercury
ionization
electron streams

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

Traction
Electrolysis
Illumination
Variable speed operation

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