The surge impedance of 400 km long overhead transmission line is 300 Ω. For a 200 km length of the same transmission line surge impedance will be
- A. 150 Ω
- B. 600 Ω
- C. 300 Ω
- D. 75 Ω
Answer: C. 300 Ω
Explanation: Surge impedance Z0 = √(L/C) is an intensive parameter determined solely by conductor geometry, remaining completely independent of transmission line length (300 Ω).