Advanced Qualification · A-002 Advanced components and circuits · A-002-011-010
Crystal oscillators, filters and microphones depend upon which principle?
- A Ferro-resonance
- B Overtone effect
- C Piezoelectric effect
- D Hertzberg effect
Correct answer: C — Piezoelectric effect. From the official ISED question bank, verified word for word.
Why
The piezoelectric effect happens when certain crystals, like quartz, change shape when you apply electricity, or create electricity when squeezed. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.