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Two single phase semi-converters are connected in series to form a series converter. The input is v = Vm sin ωt and a1, a2 are the firing angles. If a1 = 0, the dc output voltage is

(1 + cos a2)
(2 + cos a2)
(3 + cos a2)
(4 + cos a2)

Correct Answer: (3 + cos a2)

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