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# Frequency Domain Analysis – 1 – 3

11. The gain margin of a system is 0 dB. It represent a :

(a) stable system
(b) unstable system
(c) conditionally stable system
(d) marginally stable system

Explanation
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12. For a factor 1/(s + 4 )2 at ω = 2

(a) -6 dB
(b) -2 dB
(c) -4 dB
(d) +6 dB

Explanation
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13. A transfer function which has all its poles and zeroes only in the left-half of the s-plane us called :

(a) an all-pass transfer function
(b) a minimum-phase transfer function
(c) a non minimum-phase transfer function
(d) none of these

Explanation
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14. Large values of gain margin and phase margin result in :

(a) a fast system
(b) an unstable system
(c) a sluggish system
(d) an underdamped system

Explanation
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15. The damping ratio ξ of a system is 0.5. The value of Mr is :

(a) 2.308
(b) 1.54
(c) 1.01
(d) none of these