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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

More
None of the listed here
Remain same
Less

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

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

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Rectifiers and Converters
The metal rectifiers, as compared to mercury arc rectifiers

can operate on heavy loads
can operate on high voltages
operate on low temperatures
give poor regulation

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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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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

anode is heated
tube is evacuated
low mercury vapour pressures are used
an auxiliary electrode is used

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

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

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