The Nyquist plot of a strictly stable  having the numerator polynomial as  encircles the critical point -1 once in the anti-clockwise direction. Which one of the following statements on the closed-loop system shown in figure, is correct?

In the Nyquist plot of the open-loop transfer function

Corresponding to the feedback loop shown in the figure, the infinite semi-circular arc of the Nyquist contour in s-plane is mapped into a point at

The open loop transfer function of a unity gain negative feedback system is given as

The Nyquist contour in the s-plane encloses the entire right half plane and a small neighbourhood around the origin in the left half plane, as shown in the figure below. The number of encirclemenets of the point (-1+j0) by the Nyquist plot of G(s), corresponding to the Nyquist contour, is denoted as N. Then N equals to

Consider a negative unity feedback system with forward path transfer function  where K, a, b, c are positive real numbers. For a Nyquist path enclosing the entire imaginary axis and right half of the s-plane in the clockwise direction, the Nyquist plot of (l + G(s)), encircles the origin of (l + G(s))-plane once in the clockwise direction and never passes through this origin for a certain value of K. Then, the number of poles of lying in the open right half of the s-plane is _______.

The open loop transfer function of a unity feedback system is given by

In G(s) plane, the Nyquist plot of G(s) passes through the negative real axis at the point

Loop transfer function of a feedback system is . Take the Nyquist contour in the clockwise direction. Then, the Nyquist plot of G(s)H(s) encircles

Nyquist plots of two functions  and  are shown in figure. 

Nyquist plot of the product of  is

A single-input single-output feedback system has forward transfer function G(s) and feedback transfer function(s). It is given that. Which of the following is true about the stability of the system?

If  and  then for , the Nyquist plot for becomes asymptotic to the line

Consider the following Nyquist plots of loop transfer functions over ω = 0 to ω= ∞.  Which of these plots represents a stable closed loop system?

In the GH(s) plane, the Nyquist plot of the loop transfer function passes through the negative real axis at the point  

The Nyquist plot of loop transfer function G(s) H(s) of a closed loop control system passes through the point (−1, j0) in the G(s) H(s) plane. The phase margin of the system is

A unity feedback system has the open loop transfer function                 

The Nyquist plot of G encircles the origin

Which of the following is the transfer function of a system having the Nyquist plot in figure?