Advanced Qualification · A-004 Power supplies · A-004-001-006
La fréquence d'ondulation produite par un bloc d'alimentation à double alternance branché sur le courant domestique est :
- A120 Hz
- B60 Hz
- C90 Hz
- D30 Hz
Correct answer: A — 120 Hz. Question tirée de la banque officielle d'ISDE.
Why
In Canada, household electricity alternates 60 times per second, creating a 60 Hz cycle. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies is section A-004 of the Advanced exam: Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.
Drill A-004 — free, no account