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Rectifiers and Converters

Rectifiers and Converters
In which of the following equipment direct current is needed?

Relay
Time switches
All of the listed here
Telephones

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Rectifiers and Converters
The advantage of mercury arc rectifier is that

All of the listed here
it has high efficiency
it is comparatively noiseless
it is light in weight and occupies small floor space

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Rectifiers and Converters
In a three-phase mercury arc rectifiers each anode conducts for

One-fourth of a cycle
One-third of a cycle
One-half a cycle
Two-third of a cycle

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Rectifiers and Converters
Which of the following are the applications of D.C. system?

Electrolytic and electro-chemical processes
Arc welding
Battery charging work
All of the listed here

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

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

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

ionization
colour of mercury
electron streams
high temperature

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