Basic Qualification · B-005 Basic electronics and theory · B-005-008-006
À quoi sert le décibel?
- ADécrire les ondes radio à très haute fréquence
- BMesurer un signal en bande latérale unique
- CMesurer le rapport de deux signaux
- DDécrire une forme d'onde sur un oscilloscope
Correct answer: C — Mesurer le rapport de deux signaux. Question tirée de la banque officielle d'ISDE.
Why
The decibel is a unit used to measure the ratio of two signals, such as comparing how much stronger one radio transmission is than another. 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