The characteristic impedance of a transmission line with series impedance and shunt admittance of 25 and 16, respectively, is-

The correct answer is option 2):(1.25)

Concept:

• The characteristic impedance (Z₀) of a transmission line is the resistance it would exhibit if it were infinite in length. 
• The characteristic impedance or surge impedance of a uniform transmission line is the ratio of the amplitudes of voltage and current of a single wave propagating along the line; that is, a wave travelling in one direction in the absence of reflections in the other direction
• The Characteristic impedance of the transmission line is given as

Z₀ = \(\sqrt{Z\over Y} \)   

where

Y is the admittance

Z is the impedance

Calculation:

Given

Z = 25 

Y = 16

Z0 = \(\sqrt{Z\over Y} \)   

= \(\sqrt{25 \over 16}\)

= 1.25 Ω