Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC underdamped.
 RLC critically damped.
 RLC overdamped.
 RL.

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Power Electronics
SCR will be turned off when anode current is

 less than holding current.
  both (A) and (B).
  < latching current but greater than holding current and gate signal is 0.
 < latching current but greater than holding current and gate signal is present.

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

 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 can be turned ON only during one half cycle of an AC.
 it conducts only during one half cycle of an alternating current wave.

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Power Electronics
In forward blocking mode of a thyristor

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

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