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 _____?

A. 30° to 150°.
B. 30° to 180°.
C. 60° to 120°.
D. 60° to 180°.

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