Question

In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to

• A. a decrease in the value of reactance
• B. an increase in the value of reactance
• C. no change in the reactance value
• D. no change in the impedance value

Hint:

On a Smith Chart: - Clockwise: Towards Generator \(\implies\) Inductive \(\implies\) Reactance Increases. - Counter-Clockwise: Towards Load \(\implies\) Capacitive \(\implies\) Reactance Decreases.

Answer 1

The Correct Option is B

Step 1: Smith Chart Axes ExplainedThe Smith Chart visually represents the complex reflection coefficient using constant resistance circles and constant reactance arcs. The top half indicates positive (inductive) reactance, while the bottom half shows negative (capacitive) reactance.
Step 2: Interpreting Chart MovementsMovement on a constant resistance circle implies a fixed real impedance component, with only the imaginary component (reactance) changing. Moving clockwise on the chart signifies movement "towards the generator" or the effect of adding transmission line length.
Step 3: Clockwise Movement and ReactanceA clockwise path along a constant resistance circle transitions from the capacitive (bottom) region, crosses the real axis (zero reactance), and enters the inductive (top) region. This signifies a continuous reactance increase (from negative, through zero, to positive values). Thus, clockwise movement means increasing reactance.