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
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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