Discussion
The average DC output of a single-phase, half-wave controlled rectifier will be maximum if the firing angle is ______.
Answer: A
For a single phase half wave controlled rectifier with a resistive load the average output voltage is
\[ V_{dc} = \frac{V_m}{2\pi}(1 + \cos\alpha) \]
This is greatest when \(\cos\alpha\) is greatest, that is at \(\alpha = 0^\circ\), where \(V_{dc} = V_m/\pi\), the value of an uncontrolled rectifier. As the firing angle increases, \(V_{dc}\) falls, to \(V_m/(2\pi)\) at 90 degrees and to zero at 180 degrees. The answer is \(0^\circ\), option A.
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