Power Electronics
In reverse blocking mode of a thyristor

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

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

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