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Rectifiers and Converters

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

Copper
Graphite
Boron carbide
Aluminium

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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
an auxiliary electrode is used
anode is heated

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

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

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

Rectifiers
All of the listed here
Rotary converters
Motor converters

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Rectifiers and Converters
Which of the following is reversible in action?

Rotary converter
Motor converter
Motor generator set
All of the listed here

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

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

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