# Transmission lines (feeders)

### Explanation of question 3

The characteristic impedance of a transmission line is the input impedance of

- i 1m of that line
- ii the line when it is terminated by its characteristic impedance

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii is true
4. i and ii are both false

The answer is :- 3 Two definitions of characteristic impedance are used. The first definition is the input impedance of an infinite length of that line (not 1m). The second definition is that given in ii, a more practical definition.

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