A waveform with large gaps between positive voltage peaks results from:

A waveform with large gaps between positive voltage peaks typically indicates that only one half of the AC waveform is being utilized, which is characteristic of half-wave rectification. In this process, the rectifier allows only the positive half of the AC wave to pass through, effectively blocking the negative half. As a result, the output waveform consists of a series of positive voltage peaks followed by gaps where the voltage drops to zero during the blocked negative cycles.

In contrast, full-wave rectification would produce a smoother waveform with no gaps between peaks, as both halves of the AC waveform are used. Non-rectification would produce a continuous waveform without any gaps, while direct current would present a constant voltage with no alternating characteristics.

Thus, the presence of large gaps in the waveform clearly aligns with the concept of half-wave rectification, confirming the answer.