The loop transfer function of a negative feedback system is G(s)H(s)=1s(s−2). The Nyquist plot for the above system _____.
A
does not encircle (−1+j0) point.
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B
encircles (−1+j0) point once inthe clockwise direction
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C
encircles (−1+j0) point twice in the counterclockwise direction
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D
encircles (−1+j0) point once in the conterclockwise direction
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Solution
The correct option is B encircles (−1+j0) point once inthe clockwise direction G(s)H(s)=1s(s−2)
From Nyquist plot N=−1 P=1 ∴ Nyquist plot encircles (−1,0) once in clockwise direction.