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Rectifiers and Converters

Rectifiers and Converters
The ionization potential of mercury is approximately

10.4 V
None of the listed here
16.4 V
5.4 V

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Rectifiers and Converters
A rotary converter combines the function of

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

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Motor converter
Mercury arc rectifier
Motor-generator set
Rotary converter

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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

tube is evacuated
low mercury vapour pressures are used
anode is heated
an auxiliary electrode is used

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

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

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Rectifiers and Converters
The ignited or auxiliary anode in mercury arc rectifier is made of

Boron carbide
Graphite
Copper
Aluminium

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