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GATE 2019: Control System Quiz 6
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Question 1
A unity feedback control system is characterized by the open-loop transfer function
G(s)=
The Nyquist path and the corresponding Nyquist plot of G(s) are shown in the figures below.
If 0 < K < 1, then the number of poles of the closed-loop transfer function that lie in the right – half of the s-plane is
G(s)=
The Nyquist path and the corresponding Nyquist plot of G(s) are shown in the figures below.
If 0 < K < 1, then the number of poles of the closed-loop transfer function that lie in the right – half of the s-plane is
Question 2
A plant transfer function is given as 
. When the plant operates in a unity feedback configuration, the condition for the stability of the closed loop system is
. When the plant operates in a unity feedback configuration, the condition for the stability of the closed loop system isQuestion 3
The number and direction of encirclements around the point –1 + j0 in the complex plane by the Nyquist plot of 
is
is Question 4
Figure shows the Nyquist plot of the open–loop transfer function G(s)H(s) of a system. If G(s) H(s) has one right hand pole, the closed loop system is
Question 5
Consider the feedback system shown in the figure. The Nyquist plot G(s) of is also shown. Which one of the following conclusions is correct?
Question 6
Consider a control system having open loop transfer function 
If all the finite poles has positive real part, then the polar plot of the system will be
If all the finite poles has positive real part, then the polar plot of the system will be- 985 attempts
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Feb 11ESE & GATE EE
