MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
Statement 1: In constant M circles, as M increases from 1 to 8 radius of circle increases from 0 to 8 and Centre shifts from (-1,0) to (-8,0)Statement 2: The circle intersects real axis at point (-1/2, 0) |
| A. | Statement 1 is TRUE, 2 is FALSE |
| B. | Statement 1 is FALSE, 2 is TRUE |
| C. | Statement 1 & 2 TRUE |
| D. | Statement 1 & 2 FALSE |
| Answer» E. | |
| 2. |
The gain margin for the system with open loop transfer functionG(s) H(s) = G(s) =2(1+s) / s2 is |
| A. | 8 |
| B. | 0 |
| C. | 1 |
| D. | -8 |
| Answer» C. 1 | |
| 3. |
The gain margin (in dB) of a system having the loop transfer functionG(s) H(s) = 2 / s(s+1) is |
| A. | 0 |
| B. | 3 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 4. |
For the transfer functionG(s) H(s) = 1 / s(s+1) (s+0.5), the phase cross-over frequency is |
| A. | 0.5 rad/sec |
| B. | 0.707 rad/sec |
| C. | 1.732 rad/sec |
| D. | 2 rad/sec |
| Answer» C. 1.732 rad/sec | |
| 5. |
The corner frequencies are |
| A. | 0 and 1 |
| B. | 0 and 2 |
| C. | 0 and 1 |
| D. | 1 and 2 |
| Answer» E. | |
| 6. |
The polar plot of the open loop transfer function of a feedback control system intersects the real axis at -2. The gain margin of the system is |
| A. | -5dB |
| B. | 0dB |
| C. | -6dB |
| D. | 40dB |
| Answer» D. 40dB | |
| 7. |
If a system has an open loop transfer function1-s / 1+s, then the gain of the system at frequency of 1 rad/s will be |
| A. | 1 |
| B. | 1/2 |
| C. | Zero |
| D. | -1 |
| Answer» E. | |
| 8. |
Consider the following statements:The gain margin and phase margin of an unstable system may respectively be1. Positive, positive2. Positive, negative3. Negative, positive4. Negative, negativeOf these statements |
| A. | 1 and 4 are correct |
| B. | 1 and 2 are correct |
| C. | 1, 2 and 3 are correct |
| D. | 2,3 and 4 are correctView Answer |
| Answer» E. | |
| 9. |
The unit circle of the Nyquist plot transforms into 0dB line of the amplitude plot of the Bode diagram at |
| A. | 0 frequency |
| B. | Low frequency |
| C. | High frequency |
| D. | Any frequency |
| Answer» E. | |
| 10. |
The open loop transfer function of a system is G(s) H(s)= K / (1+s)(1+2s)(1+3s)The phase cross over frequency ωc is |
| A. | V2 |
| B. | 1 |
| C. | Zero |
| D. | V3 |
| Answer» C. Zero | |
| 11. |
Consider the following statements:1. The effect of feedback is to reduce the system error2. Feedback increases the gain of the system in one frequency range but decreases in another3. Feedback can cause a system that is originally stable to become unstableWhich of these statements are correct. |
| A. | 1,2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 12. |
THE_POLAR_PLOT_OF_THE_OPEN_LOOP_TRANSFER_FUNCTION_OF_A_FEEDBACK_CONTROL_SYSTEM_INTERSECTS_THE_REAL_AXIS_AT_-2._THE_GAIN_MARGIN_OF_THE_SYSTEM_IS?$ |
| A. | -5dB |
| B. | 0dB |
| C. | -6dB |
| D. | 40dB |
| Answer» E. | |
| 13. |
For the transfer function$ |
| A. | H(s) = 1 / s(s+1) (s+0.5), the phase cross-over frequency is |
| B. | 0.5 rad/sec |
| C. | 0.707 rad/sec |
| D. | 1.732 rad/sec |
| Answer» E. | |
| 14. |
The corner frequencies are$ |
| A. | 0 and 1 |
| B. | 0 and 2 |
| C. | 0 and 1 |
| D. | 1 and 2 |
| Answer» C. 0 and 1 | |
| 15. |
The gain margin for the system with open loop transfer function |
| A. | H(s) = G(s) =2(1+s) / s2 is |
| B. | 8 |
| C. | 0 |
| D. | 1 |
| Answer» E. | |
| 16. |
If a system has an open loop transfer functio? |
| A. | |
| B. | 1 |
| C. | 1/2 |
| Answer» D. | |
| 17. |
If the gain of the open-loop system is doubled, the gain margin |
| A. | Is not affected |
| B. | Gets doubled |
| C. | Becomes half |
| D. | Becomes one-fourth |
| Answer» B. Gets doubled | |
| 18. |
The open loop transfer function of a system is G(s) H(s)= K / (1+s)(1+2s)(1+3s) |
| A. | |
| B. | V2 |
| C. | 1 |
| Answer» C. 1 | |
| 19. |
The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is |
| A. | Zero |
| B. | -1dB |
| C. | 1dB |
| D. | Infinity |
| Answer» B. -1dB | |
| 20. |
The constant M circle for M=1 is the |
| A. | straight line x=-1/2 |
| B. | critical point (-1j0) |
| C. | circle with r= 0.33 |
| D. | circle with r=0.67 |
| Answer» B. critical point (-1j0) | |