E7E08:What are the principal frequencies that appear at the output of a mixer?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E7E08 is The two input frequencies along with their sum and difference frequencies.
The key fact is The two input frequencies along with their sum and difference frequencies. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.