A single-phase full-wave AC phase controller feeds power to a resistive load of 100 Ω from a 220 V, 50 Hz supply. What will be the rms output voltage at delay angles $${\alpha _1} = {\alpha _2} = \alpha = \frac{\pi }{2}$$ of both transistors?
A. $$\frac{{220}}{{\sqrt 2 }}{\text{V}}$$
B. $$\sqrt {2 \times 220} {\text{ V}}$$
C. $$\sqrt 2 \times 110{\text{ V}}$$
D. $$\sqrt 2 \times 220{\text{ V}}$$
Answer: Option A
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