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The constant M circle for M=1 is the

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The constant M circle for M=1 is the

(a) straight line x=-1/2

(b) critical point (-1j0)

(c) circle with r= 0.33

(d) circle with r=0.67

I had been asked this question during an interview for a job.

Query is from Polar Plots topic in portion Frequency Response Analysis of Control Systems

1 Answer

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Best answer
Right answer is (a) straight line x=-1/2

Explanation: For M =1 the constant M circle is a straight line at x=-1/2.

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