Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 6000 A.
 2121.32 A.
 4242.64 A.

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

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

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Power Electronics
During gate recovery time

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

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