21. The frequency where M has a peak value is known as the :

(a) peak frequency

(b) resonant frequency

(c) normalised frequency

(d) none of these

22. At the phase crossover frequency, ω =10 rad/s,│G(j ω)H(j ω) │= -8 dB. The system is :

(a) stable

(b) unstable

(c) conditionally stable

(d) cannot be predicted

23. The phase margin of a system is 0˚. It represents a :

(a) stable system

(b) unstable system

(c) conditionally stable system

(d) marginally stable system

24. A transfer function having a pole – zero pattern which is anti – symmetric about the imaginary axis is called :

(a) an all – pass transfer function

(b) a minimum – phase transfer function

(c) a nonminimum – phase transfer function

(d) none of these

25. At the phase crossover frequency, ω =5 rad/s,│G(jω)H(j ω) │= 10 dB. The system is :

(a) stable

(b) unstable

(c) conditionally stable

(d) cannot be predicted

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