Advanced Qualification · A-002 Advanced components and circuits · A-002-011-007
Electrically, what does a crystal look like?
- A A variable tuned circuit
- B A very high Q tuned circuit
- C A very low Q tuned circuit
- D A variable capacitance
Correct answer: B — A very high Q tuned circuit. From the official ISED question bank, verified word for word.
Why
A crystal acts like a very high Q tuned circuit because it vibrates with extreme precision at one specific frequency, losing very little energy in the process. 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.