Power Electronics
An SCR is considered to be a semi controlled device because

 it can be turned ON only during one half cycle of an AC.
 it can be turned OFF but not ON with a gate pulse.
 it can be turned ON but not OFF with a gate pulse.
 it conducts only during one half cycle of an alternating current wave.

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Power Electronics
Maximum di / dt in a SCR is

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

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