Power Electronics
Light triggering mainly used in

 low - voltage direct current transmission.
  high voltage direct current transmission.
  all of these.
 medium voltage direct current transmission.

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Power Electronics
Delay time is defined by the interval when

 gate current increases from 90 % to 100 % of its final value.
 anode voltage drops from 100 % to 90 % of its actual value.
  all of these.
 anode current reaches 10 % from forward leakage current.

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Power Electronics
During gate recovery time

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

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