Question

Determine the Z-parameter Z22 in the circuit shown below.

(a) 1

(b) 3

(c) 2

(d) 4

I have been asked this question by my college director while I was bunking the class.

My question is from Terminated Two-Port Network in chapter Two-Port Networks of Network Theory

Answer 1

The correct choice is (c) 2

Easy explanation: The Z-parameter Z21 is V2/I2 |I1=0. This parameter is obtained by open circuiting port 1. So we get V2 = ((2+2)||4)I2 => V2 = 2(I2) => V2/I2 = 2. On substituting Z21 = 2Ω.