Basic Qualification · B-005 Basic electronics and theory · B-005-010-009
What property allows an RF bypass capacitor to have little effect on an audio circuit?
- A High reactance at audio frequencies
- B Low reactance at radio frequencies
- C High reactance at radio frequencies
- D Low reactance at audio frequencies
Correct answer: A — High reactance at audio frequencies. From the official ISED question bank, verified word for word.
Why
An RF bypass capacitor works by offering high resistance, called reactance, to audio signals so they pass through the circuit unchanged instead of being diverted to ground. The full explanation — and one for every question — is in Pro.
Practise this section
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.