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

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Power Electronics
Delay time is defined by the interval when

  all of these.
 anode current reaches 10 % from forward leakage current.
 gate current increases from 90 % to 100 % of its final value.
 anode voltage drops from 100 % to 90 % of its actual value.

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