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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

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

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Rectifiers and Converters
Copper oxide rectifier is usually designed not to operate above

55°C
45°C
75°C
30°C

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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
Internal losses will be reduced
The rectifier will operate at reduced efficiency
Both ion and electron streams will move in the same direction

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Rectifiers and Converters
It is the_______of the transformer on which the magnitude of angle of overlap depends.

all of the listed here
leakage reactance
resistance
capacitance

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

60°C
75°C
40°C
25°C

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Rectifiers and Converters
Which of the following methods may be used to convert A.C. system to D.C.?

Rectifiers
Rotary converters
Motor converters
All of the listed here

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