Basic Qualification · B-004 Circuit components · B-004-001-011
Quel est le résultat d'une rétroaction ("feedback") positive excessive dans un amplificateur?
- ALa distorsion est minimisée
- BLa réponse en fréquence est uniformisée
- CLe gain de tension est réduit
- DDes oscillations apparaissent
Correct answer: D — Des oscillations apparaissent. Question tirée de la banque officielle d'ISDE.
Why
When an amplifier feeds too much of its output signal back into its input in the same phase, it creates a runaway loop where the signal keeps growing on its own without any new input. The full explanation — and one for every question — is in Pro.
Practise this section
Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.
Drill B-004 — free, no account