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Determine the input impedance of the network shown below.(a) 4.25(b) 3.25(c) 2.25(d) 1.25I had been asked this question in a job interview.My doubt is from Terminated Two-Port Network in chapter Two-Port Networks of Network Theory

Answer»

Correct choice is (b) 3.25

For EXPLANATION: From the figure by INSPECTION we can say that the source RESISTANCE is 1Ω. So ZIN = (V1/I1) + Source resistance. We had V1/I1 = 2.25. On substituting Zin=1+2.25=3.25Ω.



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