Power Electronics
A GTO can be turned on by applying

 Positive drain signal.
 None of these.
  Positive gate signal.
 Positive source signal.

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

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