Electronics and Communication Engineering - Automatic Control Systems - Discussion

1. 

For the system in the given figure the characteristic equation is

[A].
[B].
[C]. K(s + 1)(s + 3) = 0
[D]. s(s + 2) = 0

Answer: Option A

Explanation:

Transfer function = .

Hence characteristic equation is .


Shahwaz said: (May 6, 2014)  
Where is output and input of this system?

Ramya said: (May 29, 2015)  
Here characteristics equation is 1+G(s)H(s) = 0.

Sujji said: (Nov 4, 2015)  
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: (May 26, 2016)  
Characteristic equation is given by 1 + G(S) H(S) = 0.

So, H(s) = 0.

Sagar Kumar said: (Jun 29, 2016)  
This is helpful to improve the technical skills. Please provide more advance questions.

Shristy said: (May 14, 2017)  
I think the H(s) is not 0 it is 1.

Abhishek said: (Sep 4, 2017)  
I think k(s+1) (s+3) =0 will be the answer.

Chanchal said: (Feb 2, 2018)  
@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: (May 1, 2019)  
Thank you all.

Mufeed said: (May 1, 2019)  
For unity feedback systems the transfer function is G (S)/1+G (S).

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

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