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Frequency Domain Analysis – 1 – 4

16. For a stable system :

(a) gain margin must be positive but phase margin can be positive or negative
(b) phase margin must be positive but gain margin can be positive or negative
(c) both gain margin and phase margin must be positive
(d) one of them must be zero

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

17. At the phase crossover frequency, ω =10 rad/s,│G(j ω)H(j ω) │= 15 dB. Its gain margin :

(a) 15 dB
(b) 0 dB
(c) -15 dB
(d) cannot be predicted

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

18. At the gain crossover frequency :

(a) │G G(jω)H(jω) │ = 0 dB
(b) │ G(jω)H(jω) │ = 1 dB
(c) │ G(jω)H(jω) │ = -20 dB
(d) │ G(jω)H(jω) │ = 20 dB

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

19. For the pole factor 1/(s+5), the corner frequency is :

(a) ω = 1/5
(b) ω = 5
(c) ω = -5
(d) ω = -1/5

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

20. For a second – order system, ωn = 8 and ξ= 0.5. The value of ωr in rad/s is :

(a) 4.657
(b) 5.657
(c) 6.657
(d) none of these

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

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