Question

For the given information Z11 = 3, Z12 = 1, Z21 = 2, Z22 = 1. What is the product of ∆y and ∆z is?

(a) 3

(b) 2

(c) 1

(d) 0

I have been asked this question in exam.

This intriguing question comes from Inner Relationships of Different Parameters in chapter Two-Port Networks of Network Theory

Answer 1

The correct choice is (c) 1

To elaborate: ∆y is the determinant of y parameters and ∆z is the determinant of z parameters. And we obtained ∆y = 1 and ∆z = 1. So their product = (1) (1) = 1.