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If a full wave rectifier circuit is operating from 50Hz mains, the fundamental frequency in the ripple will be

1. 100Hz
2. 25Hz
3. 50Hz
4. 70.7Hz

Correct answer: 100Hz

Solution

In a full-wave rectifier, the output frequency of the ripple is twice the input AC mains frequency because both the positive and negative halves of the AC waveform are rectified. For a 50Hz input, the ripple frequency will be 2 × 50Hz = 100Hz.

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