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RECTIFIERS AND CONVERTERS

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

ionization
colour of mercury
electron streams
high temperature

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Rectifiers and Converters
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

Both of the listed here
They do not require any voltage for filament heating
They are mechanically strong
None of the listed here

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Rectifiers and Converters
Copper oxide rectifier is usually designed not to operate above

75°C
30°C
45°C
55°C

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Rectifiers and Converters
Which of the following AC. motors is usually used in large motor-generator sets?

Squirrel cage induction motor
Slip ring induction motor
Synchronous motor
Any of the listed here

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Rectifiers and Converters
Which of the following are the applications of D.C. system?

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

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