Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
 both (A) and (B).
 of short duration.
  of long period.

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Power Electronics
During gate recovery time

 charge carriers of J3 junction is removed.
  charge carriers of J2 junction recombined.
 charge carriers of J2 junction is swept out.
 charge carrier of J1 junction removed.

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