Which of these is a valid maximum range setting on the RANGE SELECT switch?

• A. 250 nm
• B. 100 nm
• C. 5 nm
• D. 180 nm

Answer: (B)

The concept being tested is how the RANGE SELECT switch sets the radar’s display to a fixed maximum range that the system can actually show. The instrument can only display targets up to its built‑in maximum range, and only certain preset range values are available. A valid maximum must be one of those presets that the radar can support; options that exceed the system’s capability aren’t usable as a maximum, while the smallest option isn’t the maximum either. Among the given choices, the only value that represents the actual maximum the radar can display is the middle option—it’s the largest preset the unit can handle without exceeding its limit. The other choices are either too large for the radar to display or are smaller than the maximum setting.