Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 60° to 120°.
 60° to 180°.
 30° to 150°.
 30° to 180°.

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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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