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If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?(a) 0 dB(b) 2.0201 dB(c) 4 dB(d) 6.0205 dBThis question was posed to me by my school teacher while I was bunking the class.This intriguing question comes from Nyquist Stability Criterion topic in division Stability in Frequency Domain of Control Systems

Answer»

Right option is (d) 6.0205 dB

The best I can EXPLAIN: GAIN Margin is calculated by taking inverse of the gain where the Nyquist PLOT CUTS the real AXIS.



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