Power Electronics
Rise time is defined by the interval when

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

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

 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.
 it can be turned ON but not OFF with a gate pulse.
 it can be turned OFF but not ON with a gate pulse.

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