GATE EC 1992 Electromagnetics Solution Q 1

GATE EC 1992 Electromagnetics Solution Q 1

A transmission line whose characteristic impedance is a real

(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

Ans :- (a) and (b)

Explanation

For a lossless line, R = 0 and G = 0 i.e. \alpha = 0

\beta=\omega\sqrt{LC} Z_0=R_0=\sqrt{\frac LC}

For a distortionless line, RC = LG

\alpha=\sqrt{RG} \beta=\omega\sqrt{LC} Z_0=R_0=\sqrt{\frac LC}

In both case impedance is real.

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