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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier, the anode is usually made of

graphite
aluminium
silver
copper

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Rectifiers and Converters
A rotary converter is a single machine with

two armatures and one field
one armature and two fields
one armature and one field
none of the listed here

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

Motor converters
All of the listed here
Rotary converters
Rectifiers

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Rectifiers and Converters
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

30, 60
20, 30
40, 50
75, 85

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Rectifiers and Converters
Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

Selenium rectifiers
Mercury arc rectifiers
Copper oxide rectifiers
Mechanical rectifiers

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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
Remain same
Less
More

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