Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 both (A) and (B).
 of short duration.
 neither (A) nor (B).
  of long period.

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Power Electronics
Maximum di / dt in a SCR is

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

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