Question

The ratio of the transfer function Io/Is is

(a) s(s + 4)/(s^2 + 3s + 4)

(b) s(s + 4)/(s + 1)(s + 3)

(c) (s^2 + 3s + 4)/s(s + 4)

(d) (s + 1)(s + 3)/s(s + 4)

I have been asked this question in an interview for job.

This interesting question is from Circuit analysis in S domain in portion EDC Overview of Electronic Devices & Circuits

Answer 1

The correct option is (b) s(s + 4)/(s + 1)(s + 3)

Explanation: Io/Is = (s + 4)/ (s + 4 + 3/s) = s(s + 4)/(s + 1)(s + 3).