The characteristic impedance of a transmission line is:
- Independent of its length
- Directly proportional to its length
- Directly proportional to square root of its length
- Inversely proportional to square root of its length
Correct answer: 1. Independent of its length
Explanation: The characteristic impedance (Z₀) of a transmission line is independent of its length. The characteristic impedance is a property of the transmission line itself and is determined by the ratio of the line’s distributed inductance per unit length to its distributed capacitance per unit length. It is denoted by the symbol Z₀.