Q.

Nichol’s chart:

A. constant gain and constant phase shift loci of the closed-loop system.
B. plot of loop gain with the variation in frequency
C. circles of constant gain for the closed loop transfer function
D. circles of constant phase shift for the closed loop transfer function
Answer» B. plot of loop gain with the variation in frequency
Explanation: nichol’s chart are plot of loop gain with the variation in frequency and this is used to determine the stability of the system with the variation in the frequency.
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