Stability Analysis from Bode Plot
Trending Questions
Q. The asymptotic Bode plot of the transfer function
K/[1+(s/a)] is given in figure. The error in phase angle and dB gain at a frequency of ω=0.5 are respectively.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1148605/original_39.a1.png)
K/[1+(s/a)] is given in figure. The error in phase angle and dB gain at a frequency of ω=0.5 are respectively.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1148605/original_39.a1.png)
- 4.9∘, 0.97 dB
- 5.7∘, 3 dB
- 4.9∘, 3 dB
- 5.7∘, 0.97 dB
Q.
The figure below shows the bode magnitude and phase plots of a stable transfer function
G(s)=n0s3+d2s2+d1s+d0
Consider the negative unity feedback configuration with gain k in the feedforward path. The closed loop in stable for k<k0. The maximum value of k0 is
- 0.1
Q. The asymptotic magnitude Bode plot of an open loop system G(s) with K > 0 and all poles and zeros on the left hand side of the s-plane is shown in the figure. It is completetly sysmmetric about ωc. The minimum absolute angle contribution by G(s) is given by
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1180630/original_7.11_dia.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1180630/original_7.11_dia.png)
- 78.6o
- 90o
- 101.4o
- 180o
Q. The asymptotic Bode magnitude plot of lead network with its pole and zero on the left half of the s-plane is shown in the adjoining figure. The frequency at which the phase angle of the network in maximum (in rad/s) is
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1180725/original_7.22.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1180725/original_7.22.png)
- 3√10
- 1√20
- 120
- 130
Q. Bode plot of a plant transfer function with unity negative feedback is shown below
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1412655/original_157_-_que_7.png)
If a lead compensator is added, then system becomes.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1412655/original_157_-_que_7.png)
If a lead compensator is added, then system becomes.
- Effect of lead compensator is similar to addition of zero. So, system becomes more stable.
- less stable
- marginal stable
- unstable
Q. The approximate phase response of 1002e−0.01ss2+0.2s+1002is