Question

Multiple Choice questions

Question 2
When line losses are neglected, simpler expressions for line parameters are
obtained. How are the expressions of the exact

Answer 1

When line losses are neglected (R=G=0) simpler expressions are obtained and certain important

concepts are more easily analyzed. Lossless line Generally the lines are designed to have very small losses. Also for high-frequency studies such as lightning surges, the lossless line approximation will be even accurate, as wL and wC are very large compared to R.

Characteristic impedance Z for a lossless line is derive as below

$Z=\sqrt{\dfrac{R+j\omega{L}}{G+j\omega{C}}}\\ R=G=0\\ \therefore Z=\sqrt{\dfrac{L}{C}}$