# Transmission lines (feeders)

### Explanation of question 2

The characteristic impedance of an unbalanced feeder is determined by the

- i diameter of the inner conductor and inner diameter of the sheath
- ii relative permittivity of the dielectric

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 :- 1An unbalanced feeder has an outer conductor (sheath) enclosing an inner conductor. The two conductors are separated by a dielectric. The characteristic impedance depends upon the diameter of the inner conductor and the inner diameter of the sheath, since the ‘return’ current only slightly penetrates this sheath due to the ‘skin effect’. The characteristic impedance is reduced due to the relative permittivity of the dielectric.

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