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

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

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Power Electronics
Maximum di / dt in a SCR is

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

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Power Electronics
In reverse blocking mode of a thyristor

 junction J3 is in forward bias and J1, J2 in reverse bias.
  junction J1, J3 is in reverse bias and J2 is in forward bias.
 junction J2 is in reverse bias and J1, J3 is in forward bias.
 junction J1 and J2 is in forward bias and J3 is in reverse bias.

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