Introduction to Stability
Trending Questions
Q. The open loop transfer function of an unity feedback open loop system is 2s2+6s+5(s+1)2(s+2). The characteristic equation of the closed loop system is
- 2s2+6s+5=0
- (s+1)2(s+2)=0
- 2s2+6s+5+(s+1)2(s+2)=0
- 2s2+6s+5−(s+12)(s+2)=0
Q. The closed loop system of figure is stable if the transfer function T(s)=C(s)R(s) _____.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1146742/original_4.1.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1146742/original_4.1.png)
- has all the close loop zeros in left half of the s-plane.
- has all the close loop poles in left half of the s-plane.
- has one of the close loop pole in right half of the s-plane.
- Data insufficient
Q. The system shown in the figure is
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1163312/original_21.a1.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1163312/original_21.a1.png)
- Stable
- Unstable
- conditionally stable
- stable for input u1, but unstable for input u2