E9E06:Which of these transmission line impedances would be suitable for constructing a quarter-wave Q-section for matching a 100-ohm feed point impedance to a 50-ohm transmission line?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E9E06 is 75 ohms.
The key fact is 75 ohms. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.