MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Control Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Phase margin is: |
| A. | It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability |
| B. | It is always positive for stable feedback systems |
| C. | It is calculated at gain cross over frequency |
| D. | All of the mentioned |
| Answer» E. | |
| 2. |
Gain margin is: |
| A. | It is a factor by which the system gain can be increased to drive it to the verge of instability |
| B. | It is calculated at gain cross over frequency |
| C. | It is calculated at phase cross over frequency |
| D. | Both a and c |
| Answer» E. | |
| 3. |
Phase and gain margin are applicable to open and closed loop systems both. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
The phase angle of the system, G(s) =s+5/s2+4s+9, varies between : |
| A. | 0° and 90° |
| B. | 0° and -90° |
| C. | 0° and -180° |
| D. | -90° and -180° |
| Answer» B. 0° and -90° | |
| 5. |
The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of : |
| A. | -6 dB |
| B. | 0 dB |
| C. | 3.5 dB |
| D. | 6 dB |
| Answer» C. 3.5 dB | |
| 6. |
The phase margin (in degrees) of a system having the loop transfer function G(s) H(s)=2√3/s(s+1) is: |
| A. | 45° |
| B. | -30° |
| C. | 60° |
| D. | 30° |
| Answer» E. | |
| 7. |
GAIN_MARGIN_IS:?$ |
| A. | It is a factor by which the system gain can be increased to drive it to the verge of instability |
| B. | It is calculated at gain cross over frequency |
| C. | It is calculated at phase cross over frequency |
| D. | Both a and c |
| Answer» E. | |
| 8. |
Phase margin is:$ |
| A. | It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability |
| B. | It is always positive for stable feedback systems |
| C. | It is calculated at gain cross over frequency |
| D. | All of the mentioned |
| Answer» E. | |
| 9. |
Phase and gain margin are applicable to open and closed loop systems both? |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
The concepts used to measure relative stability are: |
| A. | Phase margin |
| B. | Gain margin |
| C. | Phase and Gain margin |
| D. | Stable |
| Answer» D. Stable | |
| 11. |
Polar plots moving toward the imaginary axis makes the system: |
| A. | Stable |
| B. | Marginally stable |
| C. | Conditionally stable |
| D. | Unstable |
| Answer» E. | |
| 12. |
As the polar plot moves toward the point (-1, 0) then the system becomes : |
| A. | Stable |
| B. | Marginally stable |
| C. | Conditionally stable |
| D. | Unstable |
| Answer» E. | |
| 13. |
The polar plot of the transfer function G(s) = 10(s+1)/s+10 will be in the : |
| A. | First quadrant |
| B. | Second quadrant |
| C. | Third quadrant |
| D. | Fourth quadrant |
| Answer» E. | |
| 14. |
The phase angle of the system, G(s) =s+5/s2+4s+9, varies between : |
| A. | 0° and 90° |
| B. | 0° and -90° |
| C. | 0° and -180° |
| D. | -90° and -180° |
| Answer» B. 0¬¨¬®‚Äö√†√ª and -90¬¨¬®‚Äö√†√ª | |
| 15. |
The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of : |
| A. | -6 dB |
| B. | 0 dB |
| C. | 3.5 dB |
| D. | 6 dB |
| Answer» C. 3.5 dB | |
| 16. |
The phase margin (in degrees) of a system having the loop transfer function G(s) H(s)=2‚àö3/s(s+1) is: |
| A. | 45° |
| B. | -30° |
| C. | 60° |
| D. | 30° |
| Answer» E. | |