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In the Bode-plot of a unit feedback control system, the value of phase of G (jω) at the gain crossover frequency is – 125º. The phase margin of the system is—
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- – 125°
- – 55°
- 55°
- 125°
- – 125°
Correct Option: C
Phase margin of system,
φPM = 180° + ∠ G (jω) H (jω)|
at gain crossover frequency
φPM = 180° – 125°
or
φPM = 55°
