In a full-wave rectifier, the number of diodes typically used with a ntre-tap transformer is:
A full-wave rectifier with a ntre-tap transformer uses two diodes, each conducting during alternate half-cycles, to rectify both positive and negative halves of the AC input.
Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Oscillations and Waves, Topic: SHM, wave motion and superposition.