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

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

(a) -6 dB

(b) -2 dB

(c) -4 dB

(d) +6 dB

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

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

15. The damping ratio ξ of a system is 0.5. The value of M_{r} is :

(a) 2.308

(b) 1.54

(c) 1.01

(d) none of these

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