Numerical - Nyquist plot for a given gain margin of f/b system

Q.  Consider a feedback system with gain margin of about 30. At what point does Nyquist plot crosses negative real axis?
- Published on 09 Oct 15

a. -3
b. -0.3
c. -30
d. -0.03

ANSWER: -0.3
 

    Discussion

  • prashant   -Posted on 29 Aug 16
    it should be -.03 as 20log(1/.03)=30db

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