Question

For maximum power transfer, a lossless transmission line 50 ohm is to be matched to a resistive load impedance of 100 ohm. The characteristic impedance of the wavelength/4 transformer is

(a) 70.7

(b) 50

(c) 100

(d) Infinity

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Question is from Advanced and Tricky Questions in section Advanced and Tricky Questions of Electromagnetic Theory

Answer 1

Right answer is (a) 70.7

The best explanation: For maximum power transfer, Zin = Z0^2/ZL. On substituting for the given values, we get the characteristic impedance as 70.7 ohm.