# Electronics and Communication Engineering - Automatic Control Systems - Discussion

Discussion Forum : Automatic Control Systems - Section 1 (Q.No. 1)
1.
For the system in the given figure the characteristic equation is
K(s + 1)(s + 3) = 0
s(s + 2) = 0
Explanation:

Transfer function = .

Hence characteristic equation is .

Discussion:
13 comments Page 1 of 2.

Where is output and input of this system?

Ramya said:   9 years ago
Here characteristics equation is 1+G(s)H(s) = 0.

SUJJI said:   9 years ago
For unity feedback systems the transfer function is G (S)/1+G (S).

So the characteristic equation is 1+G (S) = 0.

Navtej bhangu said:   8 years ago
Characteristic equation is given by 1 + G(S) H(S) = 0.

So, H(s) = 0.

Sagar kumar said:   8 years ago

Shristy said:   7 years ago
I think the H(s) is not 0 it is 1.

Abhishek said:   7 years ago
I think k(s+1) (s+3) =0 will be the answer.

Chanchal said:   6 years ago
@ALL.

As per the question, characteristics eq. 1+ G(s).H(s). Here H(s) is unity. So option A is right.

Mufeed ardouno said:   5 years ago
Thank you all.

Mufeed said:   5 years ago
For unity feedback systems the transfer function is G (S)/1+G (S).

So, the characteristic equation is 1+G (S) = 0.