Discussion
If a full wave rectifier circuit is operating from 50 Hz mains, then the fundamental frequency in the ripple will be :
Answer: D
The fundamental ripple frequency is 100 Hz.
A full wave rectifier turns both half cycles of the input into positive pulses, so the output contains two pulses in every input cycle. With 50 Hz mains the output repeats every 10 ms, and the lowest frequency in the ripple is 2 × 50 = 100 Hz.
50 Hz is the ripple frequency of a half wave rectifier, which passes only one pulse per cycle. 25 Hz would need one pulse every two cycles, and 70.7 Hz looks like 50 × √2, mixing up an rms factor with a frequency.
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