# Transmission lines (feeders)

### Explanation of question 1

The characteristic impedance of a balanced feeder is determined by the

- i diameter of the wire
- ii spacing between the wires

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 :- 1 A balanced feeder has two wires, carrying the ‘forward’ and ‘return’ currents. The characteristic impedance depends upon the diameter of these two wires and the spacing between them.

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