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Rectifiers and Converters

Rectifiers and Converters
The efficiency of the copper oxide rectifier seldom exceeds

85 to 90%
80 to 85%
90 to 95%
65 to 75%

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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 directly proportional to load
is inversely proportional to load
is almost independent of load current

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

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

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Rectifiers and Converters
The potential drop in the arc, in a mercury arc rectifier, varies

0.5 V to 1.5 V per cm length of the arc
0.05 V to 0.2 V per cm length of the arc
2 V to 3.5 V per cm length of the arc
none of the listed here

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Rectifiers and Converters
In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

None of the listed here
More
Remain same
Less

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Rectifiers and Converters
In a mercury arc rectifier______ flow from anode to cathode

electrons
All of the listed here
ions
ions and electrons

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