Basic Qualification · B-005 Basic electronics and theory · B-005-007-011
A signal is composed of a fundamental frequency of 2 kHz and another of 4 kHz. What name is given to the 4 kHz signal?
- A Sub-harmonic
- B Intermodulation
- C Harmonic
- D Alias
Correct answer: C — Harmonic. From the official ISED question bank, verified word for word.
Why
A harmonic is simply a frequency that is a whole-number multiple of a lower starting frequency, called the fundamental. 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.