Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 145 μs.
 140 μs.
 130 μs.
  135 μs.

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Power Electronics
Rise time is defined by the interval when

 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.
 anode current rises 10 % to 90 % of its final value.

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