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Rectifiers and Converters

Rectifiers and Converters
A mercury arc rectifier possesses ________ regulation characteristics

curved line
exponential
none of the listed here
straight line

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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
In a mercury arc rectifier positive ions are attracted towards

cathode
anode
shell bottom
mercury pool

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Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its atomic weight is quite high
Its boiling point and specific heat are low
Its ionization potential is relatively low
All of the listed here

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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
A synchronous converter can be started

from D.C. side as D.C. motor
from A.C. side as induction motor
All of the listed here
by means of a small auxiliary motor

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