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Electronic Instrumentation and Control: Stability in frequency domain
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Electronic Instrumentation and Control: Stability in frequency domain
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25 Questions

1. For minimum phase systems:
2. Assertion (A): All the systems which exhibit overshoot in transient response will also exhibit resonance peak in frequency response. Reason (R): Large resonance peak in frequency response corresponds to a large overshoot in transient response.
3. If the gain of the open-loop system is doubled, the gain margin
4. Which one of the following statements is correct? Nichol's chart is useful for the detailed study of:
5. Constant M- loci:
6. The constant N loci represented by the equation x^2+x+y^2=0 is for the value of phase angle equal to:
7. The unit circle of the Nyquist plot transforms into 0dB line of the amplitude plot of the Bode diagram at
8. The loop transfer function of a system is given by G(s) H(s) =10e-Ls/s. The phase crossover frequency is 5rad/s. The value of the dead time L is
9. The phase cross over frequency ωc is
10. In a feedback control system, phase margin(PM) is 1. Directly proportional to G 2. Inversely proportional to G 3. Independent of G 4. Zero when G =0. Which of the above statements are correct?
11. For non-minimum phase systems:
12. For a stable closed loop system, the gain at phase crossover frequency should always be:
13. Frequency range of bode magnitude and phases are decided by :
14. The polar plot of the transfer function G(s) = 10(s+1)/s+10 will be in the :
15. The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is
16. A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :
17. The critical value of gain for the system is 40. The system is operating at a gain of 20. The gain margin of the system is :
18. The frequency at which the Nyquist diagram cuts the unit circle is known as:
19. If the system is represented by G(s) H(s) = k (s+7) / s (s +3) (s + 2), what would be its magnitude at ω = ∞?
20. For the transfer function: G(s) H(s) = 1 / s(s+1) (s+0.5), the phase cross-over frequency is
21. The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of :
22. If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?
23. The gain margin in dBs of a unity feedback control system whose open loop transfer function, G(s) H(s) =1/s(s+1) is
24. The forward path transfer function of a unity feedback system is given by G(s) = 1/(1+s)^2. What is the phase margin of the system?
25. The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of:

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