Basic Qualification · B-005 Basic electronics and theory · B-005-012-009
Les circuits résonants sont utilisés dans un récepteur pour:
- Afiltrer le courant continu
- Bamplifier les signaux audio
- Crégler les niveaux de tension
- Dsélectionner les fréquences désirées
Correct answer: D — sélectionner les fréquences désirées. Question tirée de la banque officielle d'ISDE.
Why
Resonant circuits act like a tuning fork for radio waves, vibrating strongly only at one specific frequency while ignoring others, which allows the receiver to pick out your desired station from the airwaves. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.
Drill B-005 — free, no account