Power Electronics
Rise time is defined by the interval when

 anode current rises 10 % to 90 % of its final value.
  both B and C.
 gate current rises from 90 % to 100 % of it final value.
 anode voltage drops from 90 % to 10 % of its initial value.

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Power Electronics
Dynamic equalizing circuit is used for

 equal division of current through each thyristor in parallel.
 equal division of current through each thyristor in series.
  equal division of voltage across each thyristor.
 equal division of voltage across each thyristor in parallel.

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