A transmission line whose characteristic impedance is a pure resistanc

1.	A transmission line whose characteristic impedance is a pure resistance(a) Must be a lossless line (b)Must be a distortion less line (c) May not be a lossless line (d)May not be a distortion less line
Answer» Correct option (b)Must be a distortion less line Explanation: If the transmission line is to have neither frequency nor delay distortion, then α (attenuation constant) and velocity of propagation cannot be functions of frequency. V = ω/β β must be a direct function of frequency to achieve this condition LG = CR L/C = R/G z₀ = √((R + jωL)/(G + jωC)) For a lossless line, z₀= √(L/C) α = √(RG) = 0 for R = 0, G = 0 β = ω√(LC) A loss less line is always a distortion less line

A transmission line whose characteristic impedance is a pure resistance(a) Must be a lossless line (b)Must be a distortion less line (c) May not be a lossless line (d)May not be a distortion less line

Answer»

Correct option (b)Must be a distortion less line

Explanation:

If the transmission line is to have neither frequency nor delay distortion, then α (attenuation constant) and velocity of propagation cannot be functions of frequency.

V = ω/β

β must be a direct function of frequency to achieve this condition

LG = CR

L/C = R/G

z₀ = √((R + jωL)/(G + jωC))

For a lossless line, z₀= √(L/C)

α = √(RG) = 0 for R = 0, G = 0

β = ω√(LC)

A loss less line is always a distortion less line

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A transmission line whose characteristic impedance is a pure resistance(a) Must be a lossless line (b)Must be a distortion less line (c) May not be a lossless line (d)May not be a distortion less line

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