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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier characteristic blue luminosity is due to

electron streams
high temperature
ionization
colour of mercury

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Rectifiers and Converters
In a mercury arc rectifier______ flow from anode to cathode

ions and electrons
All of the listed here
electrons
ions

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

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

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

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

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Rectifiers and Converters
In a rotary converter armature currents are

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

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Rectifiers and Converters
When a rectifier is loaded which of the following voltage drops take place ?

Arc voltage drop
All of the listed here
Voltage drop in transformer reactance
Voltage drop in resistance of transformer and smoothing chokes

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