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Find the Y – parameter Y11 in the circuit shown below.

(a) 2

(b) 3/2

(c) 1

(d) 1/2

I had been asked this question in an internship interview.

This interesting question is from Short Circuit Admittance(Y) Parameters in division Two-Port Networks of Network Theory

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Correct answer is (d) 1/2

To explain I would say: After short circuiting b-b’, the equation will be V1 = (I1) x 2. We know Y11 = I1/V1. From the equation we get I1/V1 = 2. On substituting we get Y11 = 2 mho.

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