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Rectifiers and Converters

Rectifiers and Converters
The efficiency of the copper oxide rectifier seldom exceeds

80 to 85%
90 to 95%
85 to 90%
65 to 75%

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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
Internal losses will be reduced
The rectifier will operate at reduced efficiency

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Rectifiers and Converters
The metal rectifiers, as compared to mercury arc rectifiers

give poor regulation
can operate on heavy loads
operate on low temperatures
can operate on high voltages

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Rectifiers and Converters
A rotary converter combines the function of

an induction motor and a D.C. generator
Both of the listed here
None of the listed here
a synchronous motor and a D.C. generator

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

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

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

resistance
capacitance
leakage reactance
all of the listed here

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