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Rectifiers and Converters

Rectifiers and Converters
Which of the following is reversible in action?

Rotary converter
Motor converter
Motor generator set
All of the listed here

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Rectifiers and Converters
The ionization potential of mercury is approximately

None of the listed here
5.4 V
10.4 V
16.4 V

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

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

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

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

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Rectifiers and Converters
In phase-shift control method the control is carried out by varying the of grid voltage.

polarity
phase
All of the listed here
magnitude

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

Rotary converters
Motor converters
All of the listed here
Rectifiers

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