ISRO Electrical Engineering (EE) 2017 - Question 41

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Surge impedance of overhead transmission line is normally in the order of

  • A. 1 – 5 ohms
  • B. 20 – 30 ohms
  • C. 300 – 500 ohms
  • D. 300000 – 500000 ohms

Answer: C. 300 – 500 ohms

Explanation: Surge impedance Zs = √(L/C) is typically 400 Ω (range 300–500 Ω) for overhead transmission lines, compared to 30–50 Ω for underground cables.

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