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The Nyquist plot of a system is given in the figure below. Let 
, and 
be the positive frequencies at the points 
, and 
, respectively.
Which one of the following statements is TRUE?
is the gain crossover frequency and 
is the phase crossover frequency
is the gain crossover frequency and 
is the phase crossover frequency
is the gain crossover frequency and is the phase crossover frequency
is the gain crossover frequency and is the phase crossover frequency
Gain cross over frequency is one at which 
or 
This is obtained by intersection of Polar or Nyquist Plot with the unit circle in GH Plane.
Clearly in Nyquist plot, at 
Phase crossover frequency is one at which 
,
i.e., Nyquist plot crosses (-) ve real axis 