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Rectifiers and Converters

Rectifiers and Converters
The internal efficiency of a mercury arc rectifier depends on

current only
voltage and current
r.m.s. value of current
voltage only

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Rectifiers and Converters
The advantage of mercury arc rectifier is that

All of the listed here
it is light in weight and occupies small floor space
it has high efficiency
it is comparatively noiseless

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

None of the listed here
Less
Remain same
More

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Rectifiers and Converters
Ageing of a selenium rectifier may change the output voltage by

None of the listed here
15 to 20 per cent
25 to 30 per cent
5 to 10 per cent

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Rectifiers and Converters
In a mercury arc rectifier positive ions are attracted towards

cathode
anode
shell bottom
mercury pool

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

Rectifiers
Motor converters
All of the listed here
Rotary converters

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