Power Electronics
Rise time is defined by the interval when

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

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Power Electronics
SCR will be turned off when anode current is

 < latching current but greater than holding current and gate signal is present.
  both (A) and (B).
 less than holding current.
  < latching current but greater than holding current and gate signal is 0.

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