Question
On the Smith chart shown in Figure E9-3, what is the only straight line shown?
Answer Options
- A) The reactance axis
- B) The current axis
- C) The voltage axis
- D) The resistance axis
Correct Answer: D
Explanation
The Smith Chart maps a complex impedance plane onto a circular graph using a conformal mapping technique, which converts all lines of constant impedance into curves. However, one key axis of the original complex plane remains straight on the chart.
On the Smith chart shown in Figure E9-3, the only straight line shown is the horizontal axis that passes through the center point (the 1.0 resistance circle). This line is the resistance axis (or real axis). Points on this line represent impedances where the reactive component (jX) is exactly zero, meaning the impedance is purely resistive.
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