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Rectifiers and Converters

Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

40°C
60°C
75°C
25°C

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Rectifiers and Converters
In phase-shift control method the control is carried out by varying the of grid voltage.

phase
magnitude
All of the listed here
polarity

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

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

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

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

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Rectifiers and Converters
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

anode drop and cathode drop
anode drop, cathode drop and arc drop
cathode drop and arc drop
anode drop and arc drop

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

All of the listed here
electrons
ions and electrons
ions

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