# A long overhead lossless power transmission line is terminated with its characteristic impedance. While the line is in operation

A long overhead lossless power transmission line is terminated with its characteristic impedance. While the line is in operation

### Right Answer is:

There is no reflected wave on the line

#### SOLUTION

The two important electrical properties of a symmetrical network are:

- Characteristic impedance (Z
_{o}) - Propagation constant.

** Characteristic Impedance (Z _{o})**

- Characteristic impedance is a fine and useful concept of the transmission line.
- When no part of the power sent down an infinite line returns no reflection, there is no loss of power.
- When a line that is terminated at its characteristic impedance, behaves as an infinite line, it will also have no reflection.
**A long overhead lossless power transmission line is terminated with its characteristic impedance. It indicates that the reflection coefficient is zero.**

The reflection coefficient is,

${\rm{\Gamma }} = \frac{{{Z_0} – {Z_L}}}{{{Z_0} + {Z_L}}}$

Where

Z_{L} is the line impedance

Z_{0} is the load impedance.

Therefore, there is no reflected wave on the line.

- When a line is terminated in its characteristic impedance, it is said to be correctly terminated or termed as a non-resonant line.
- The characteristic impedance of a uniform transmission line is defined as the steady-state vector ratio of the voltage to the current at the input of an infinite line.
- Alternately it is defined as the impedance looking into an infinite length of the line.
- Its unit is Ohms. It is also known as surge impedance.