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RECTIFIERS AND CONVERTERS

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

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

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Motor-generator set
Mercury arc rectifier
Rotary converter
Motor converter

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Rectifiers and Converters
Which of the following is the loss within the mercury arc rectifier chamber?

Voltage drop at the cathode
Voltage drop at the anode
All of the listed here
Voltage drop in arc

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Rectifiers and Converters
The efficiency of an electrolytic rectifier is nearly

60 %
70 %
40 %
50 %

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Rectifiers and Converters
A rotary converter is a single machine with

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

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