Advanced Qualification · A-002 Advanced components and circuits · A-002-009-001
What is the mixing process?
- A The recovery of intelligence from modulated signal
- B The elimination of noise in a wideband receiver by phase comparison
- C The combination of two signals to produce sum and difference frequencies
- D The elimination of noise in a wideband receiver by phase differentiation
Correct answer: C — The combination of two signals to produce sum and difference frequencies. From the official ISED question bank, verified word for word.
Why
Mixing happens when a receiver takes two radio signals and combines them inside a special circuit called a mixer, creating two new signals: one with a frequency equal to the sum of the originals and another equal to their difference. 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.