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If the output frequency of a full-wave rectifier is 100 Hz, then input frequency will be ________.

Asked in GUJCET 2026 · Output waveforms

Answer: (1) 50 Hz

Step-by-step solution

Idea: a full-wave rectifier inverts the negative half of every input cycle instead of discarding it, so two humps leave the circuit for each complete cycle that enters.

Hence fₒᵤₜ = 2 fᵢₙ.

fᵢₙ = (fₒᵤₜ)/2 = (100)/2

fᵢₙ = 50 Hz, the mains frequency, which is what such a rectifier is normally run from.

For a half-wave rectifier only one hump per cycle survives, and then fₒᵤₜ = fᵢₙ.

Why the other options are wrong

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