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The compensator Gc(s) =5(1+0.3s)/(1+0.1s) would provide a maximum phase shift of
Maximum phase shift sin^{1} [(1α)/(1+α)]
and
sin^{1 }[1/2] = 30°.
Correct Answer : A
Explanation : Simulation of a closedloop system with proportional control. The process transfer function is P(s) = 1/(s + 1)^{3}.
The industrial controller having the best steady  state accuracy is
consider the following statements :
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another.
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct ?
The intersection of asymptotes of root loci of a system with open loop transfer function is
The openloop transfer function of unity feedback control system is The system is stable is
0 < K < a/b (a+b)
Which one of the following characteristic equations of result in the stable operation of the feedback system ?
Consider the following statements: RouthHurwitz critierion gives
1. aboslute stability
2. the number of roots lying on the right half of the splane
3. the gainmargin and phase margin
Which of these statements are correct ?
Correct Answer :B(I and II)
Explanation : RouthHurwitz criterion gives absolute stability and number of roots lying on the right half of the splane.
Consider the following statements: A proportional plus derivative controller
1. has high sensitivity
2. increases the stability of the system
3. improves the steadystate accuracy
Which of these statements are correct ?
Open loop transfer function of a system having one zero with a positive real value is called
The given characteristic polynomial s^{4} + s^{3} + 2s^{2} + 2s + 3 =0 has
A control system has Root locus of the system can lie on the real axis
The forward path transfer function of a unity feedback system is given by What is the phase margin for this system ?
Which one of the following statement is correct ? The effects of phase lead compensator on gain crossover frequency (w_{cg}) and the bandwidth (BW) are
What is the unit step response of a unity feedback control system having forward path transfer function
The open loop transfer function is first converted into the closed loop as unity feedback is used and then value of damping factor is calculated.
An open loop system has a transfer function it is converted into a closed loop system by providing a negative feedback having transfer function 20 (s+ 1). Which one of the following is correct ? The open loop and closed loop systems are, respectively
With regard to the filtering property, the lead compensator and the lag compensator are, respectively.
For the given system, how can be steady state error produced by step disturbance be reduced ?
If the gain of the open loop system is doubled, the gain margin of the system is
Which one of the following is not a property of root loci ?
Match ListI (System G(s) with ListII (Nature of response) and select the correct answer using the code given below the lists:
Given a unity feedback system with what is the value of K for a damping ratio of 0.5 ?
What is the steady state error for a unity feedback control system having due to unit ramp input ?
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