Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 6000 A.
 2121.32 A.
 4242.64 A.

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Power Electronics
Rise time is defined by the interval when

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

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