Power Electronics
During reverse recovery time

 charge carrier of junction J2 recombined.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J3 is swept out.
  both B and C.

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Power Electronics
An SCR is considered to be a semi controlled device because

 it can be turned ON only during one half cycle of an AC.
 it conducts only during one half cycle of an alternating current wave.
 it can be turned ON but not OFF with a gate pulse.
 it can be turned OFF but not ON with a gate pulse.

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