This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Frequency Response”.

1. Scientist Evans have contribution in :

a) Asymptotic plots

b) Polar plots

c) Root locus technique

d) Constant M and n circle

2. Scientist Nyquist have contribution in:

a) Asymptotic plots

b) Polar plots

c) Root locus technique

d) Constant M and n circle

3. Scientist Bode have contribution in :

a) Asymptotic plots

b) Polar plots

c) Root locus technique

d) Constant M and n circle

4. For a stable closed loop system, the gain at phase crossover frequency should always be:

a) < 20 dB

b) < 6 dB

c) > 6 dB

d) > 0 dB

5. If the gain of the open loop system is doubled, the gain of the system is :

a) Not affected

b) Doubled

c) Halved

d) One fourth of the original value

6. Constant M- loci:

a) Constant gain and constant phase shift loci of the closed-loop system.

b) Plot of loop gain with the variation in frequency

c) Circles of constant gain for the closed loop transfer function

d) Circles of constant phase shift for the closed loop transfer function

7. Which one of the following methods can determine the closed loop system resonance frequency operation?

a) Root locus method

b) Nyquist method

c) Bode plot

d) M and N circle

8. Which one of the following statements is correct?

Nichol’s chart is useful for the detailed study of:

a) Closed loop frequency response

b) Open loop frequency response

c) Close loop and open loop frequency responses

d) None of the mentioned

9. Constant N-loci:

a) Constant gain and constant phase shift loci of the closed-loop system.

b) Plot of loop gain with the variation in frequency

c) Circles of constant gain for the closed loop transfer function

d) Circles of constant phase shift for the closed loop transfer function

10. Nichol’s chart:

a) Constant gain and constant phase shift loci of the closed-loop system.

b) Plot of loop gain with the variation in frequency

c) Circles of constant gain for the closed loop transfer function

d) Circles of constant phase shift for the closed loop transfer function