Power Electronics
SCR will be turned off when anode current is

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

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Power Electronics
Delay time is defined by the interval when

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

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