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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

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

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Rectifiers and Converters
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

Mechanical rectifiers
Copper oxide rectifiers
Electrolytic rectifiers
Selenium rectifiers

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

anode
cathode
shell bottom
mercury pool

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Rectifiers and Converters
If cathode and anode connections in a mercury arc rectifier are inter changed

The rectifier will not operate
Both ion and electron streams will move in the same direction
The rectifier will operate at reduced efficiency
Internal losses will be reduced

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Rectifiers and Converters
The voltage drop at anode, in a mercury arc rectifier is due to

high temperature inside the rectifier
self restoring property of mercury
energy spent in overcoming the electrostatic field
high ionization potential

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

A D.C. shunt motor
A D.C. series motor
A synchronous motor
An induction motor

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