Power Electronics
Maximum di / dt in a SCR is

 both A and C.
 inversely proportional to Vm of supply voltage.
 inversely proportional to L in the circuit.
  directly proportional to Vm of supply voltage.

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Power Electronics
Delay time is defined by the interval when

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

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