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Question
The potential drop in the arc, in a mercury arc rectifier, varies
Options:
A .  0.05 V to 0.2 V per cm length of the arc
B .  0.5 V to 1.5 V per cm length of the arc
C .  2 V to 3.5 V per cm length of the arc
D .  none of the above
Answer: Option D

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