In Nyquist plot of a system on adding a pole at s = 0, then plot will -

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Question

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RSMSSB JE Electrical/Mechanical 2020 Official Paper (Degree): Held on 26 Dec 2020

Answer 1

Due to adding a pole at s = 0, the angle of shifting in the Nyquist plot of the system will be a shift of 90° clockwise.

Due to adding a zero at s = 0, the angle of shifting in the Nyquist plot of the system will be a shift of 90° anti-clockwise.

The shapes of the Nyquist plot for different transfer functions are given below.

Type/Order	The shape of the Nyquist plot
Type 0, order 1 \(G\left( s \right)=\frac{1}{1+sT}\)
Type 0, order 2 \(G\left( s \right)=\frac{1}{\left( 1+Ts \right)\left( 1+{{T}_{2}}s \right)}\)
Type 1, order 1 \(G\left( s \right)=\frac{1}{s}\)
Type 1, order 2 \(G\left( s \right)=\frac{1}{s\left( 1+Ts \right)}\)