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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

d.c. only
partly a.c. and partly d.c.
None of the listed here
a.c. only

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Rectifiers and Converters
A rotary converter is a single machine with

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

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Rectifiers and Converters
Which of the following AC. motors is usually used in large motor-generator sets?

Squirrel cage induction motor
Slip ring induction motor
Any of the listed here
Synchronous motor

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Rectifiers and Converters
The applications of selenium rectifiers are usually limited to potential of

10 V
100 V
20 V
30 V

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Rectifiers and Converters
The advantage of mercury arc rectifier is that

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

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

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

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