Basic Qualification · B-005 Basic electronics and theory · B-005-008-001
A two-times increase in power results in a change of how many dB?
- A 12 dB higher
- B 1 dB higher
- C 3 dB higher
- D 6 dB higher
Correct answer: C — 3 dB higher. From the official ISED question bank, verified word for word.
Why
Doubling your power output always adds exactly 3 decibels to the signal level, which is a standard rule in radio physics where a 3 dB increase means the power has multiplied by two. 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.