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Rectifiers and Converters

Rectifiers and Converters
Ageing of a selenium rectifier may change the output voltage by

15 to 20 per cent
25 to 30 per cent
5 to 10 per cent
None 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
an auxiliary electrode is used
tube is evacuated

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Rectifiers and Converters
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

Mechanical rectifiers
Copper oxide rectifiers
Electrolytic rectifiers
Selenium rectifiers

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Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its atomic weight is quite high
All of the listed here
Its boiling point and specific heat are low
Its ionization potential is relatively low

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Rectifiers and Converters
In a glass bulb mercury arc rectifier the maximum current rating is restricted to

500 A
1500 A
200 A
2000 A

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Rectifiers and Converters
In a mercury pool rectifier, the voltage drop across its electrodes

varies exponentially with the load current
is inversely proportional to load
is almost independent of load current
is directly proportional to load

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