Q.Main purpose of oil in OCB is to 

  • AProvide insulation
  • BProvide cooling of contacts 
  • CQuenching arc
  • DNone of above 
Correct Answer : (C)

Quenching arc

Hints :

Main purpose of oil in OCB is to Quenching arc.


The most serious consequence of a major uncleared short-circuit fault could be


Which of the following results in a symmetrical fault?

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