Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-001-007
In an RF oscillator circuit designed for high stability, the positive feedback is drawn from two capacitors connected in series. These two capacitors would most likely be:
- A Mylar
- B silver mica
- C ceramic
- D electrolytics
Correct answer: B — silver mica. From the official ISED question bank, verified word for word.
Why
Silver mica capacitors are the right choice because they hold their value very well when temperature or voltage changes, which keeps the oscillator frequency steady. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.