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 _____?
Correct answer: A. 30° to 150°.
- A. 30° to 150°.
- B. 30° to 180°.
- C. 60° to 120°.
- D. 60° to 180°.
Explanation
Current can begin when 400 sin α=200, giving α=30°. It can continue until the source again falls to 200 V at 150°, so the control range is 30° to 150°.
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