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In the circuit shown below, find the Z-parameter Z11.

(a) 10

(b) 15

(c) 20

(d) 25

This question was addressed to me during a job interview.

My question comes from Inter Connection of Two-Port Networks in chapter Two-Port Networks of Network Theory

Select the correct answer from above options

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The correct option is (b) 15

The explanation: The Z –parameter Z11 is V1/I1, port 2 is open circuited. V1 = (10 + 5)I1 => V1/I1 = 15 and on substituting, we get Z11 = 2.5Ω.

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