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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier positive ions are attracted towards

shell bottom
cathode
anode
mercury pool

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

15 to 20 per cent
25 to 30 per cent
None of the listed here
5 to 10 per cent

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

All of the listed here
Rotary converters
Motor converters
Rectifiers

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Rectifiers and Converters
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

None of the listed here
Both of the listed here
They do not require any voltage for filament heating
They are mechanically strong

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

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Rectifiers and Converters
If cathode and anode connections in a mercury arc rectifier are inter changed

The rectifier will operate at reduced efficiency
Both ion and electron streams will move in the same direction
Internal losses will be reduced
The rectifier will not operate

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