Discussion
A 3-phase half-wave rectifier is supplied with a 440 V, 60 Hz supply. Find the output ripple frequency.
Answer: D
The output ripple frequency is 180 Hz. In a 3-phase half wave rectifier there are three pulses in each cycle of the supply, so the ripple frequency is three times the supply frequency.
\[ f_{ripple} = 3 \times 60 = 180\ \text{Hz} \]
The value 60 Hz would be the ripple of a single phase half wave circuit, 120 Hz would be that of a single phase full wave circuit, and 30 Hz is not a ripple frequency of any such circuit at 60 Hz. The voltage of 440 V does not change the ripple frequency. So the fourth option is the answer.
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