Question

From the circuits shown below, find the combined Z-parameter Z22.

(a) 38

(b) 28

(c) 18

(d) 8

This question was addressed to me in class test.

I would like to ask this question from Inter Connection of Two-Port Networks in chapter Two-Port Networks of Network Theory

Answer 1

Right choice is (b) 28

To explain I would say: The Z-parameter Z22 is Z22 = Z22x + Z22y and we have Z22x = 3, Z22y = 25. On substituting we get Z22 = 3 +25 = 28Ω.