The phase margin (in degrees) of a system having the loop transfer function G(s)H(s)=2√3/s(s+1) is:(a) 45°(b) -30°(c) 60°(d) 30°This question was posed to me during an interview.My doubt is from Assessment of Relative Stability Using Nyquist Criterion topic in section Stability in Frequency Domain of Control Systems

The phase margin (in degrees) of a system having the loop transfer fun

1.	The phase margin (in degrees) of a system having the loop transfer function G(s)H(s)=2√3/s(s+1) is:(a) 45°(b) -30°(c) 60°(d) 30°This question was posed to me during an interview.My doubt is from Assessment of Relative Stability Using Nyquist Criterion topic in section Stability in Frequency Domain of Control Systems
Answer» The CORRECT choice is (d) 30° For explanation I would say: PHASE margin is calculated at gain CROSS over FREQUENCY where magnitude of the TRANSFER function is 1.

Discussion

No Comment Found

Related InterviewSolutions

The polar plot of the transfer function G(s) = 10(s+1)/s+10 will be in the :(a) First quadrant(b) Second quadrant(c) Third quadrant(d) Fourth quadrantI have been asked this question during a job interview.My question is from Assessment of Relative Stability Using Nyquist Criterion topic in division Stability in Frequency Domain of Control Systems
The phase angle of the system, G(s) =s+5/s^2+4s+9, varies between :(a) 0° and 90°(b) 0° and -90°(c) 0° and -180°(d) -90° and -180°I had been asked this question during an interview.Query is from Assessment of Relative Stability Using Nyquist Criterion topic in section Stability in Frequency Domain of Control Systems
Which of the following is the non-linearity caused by servomotor?(a) Static friction(b) Backlash(c) Saturation(d) None of the mentionedThe question was asked during an interview.This interesting question is from Mathematical Preliminaries topic in portion Stability in Frequency Domain of Control Systems
Closed loop frequency response is very useful as :(a) It approximately predicts the time response of the systems(b) Time response are converted into time domain specifications(c) After design time domain specification is converted into frequency domain(d) All of the mentionedThe question was posed to me in homework.I need to ask this question from Closed-Loop Frequency Response in portion Stability in Frequency Domain of Control Systems
When the period of the observation is large, the type of the error will be:(a) Transient error(b) Steady state error(c) Half-power error(d) Position error constantI got this question in an interview.The origin of the question is Time Domain Analysis in section Stability in Frequency Domain of Control Systems
A system has a single pole at origin. Its impulse response will be:(a) Constant(b) Ramp(c) Decaying exponential(d) OscillatoryI got this question in semester exam.The query is from Time Domain Analysis topic in division Stability in Frequency Domain of Control Systems
The system with the open loop transfer function 1/s(1+s) is:(a) Type 2 and order 1(b) Type 1 and order 1(c) Type 0 and order 0(d) Type 1 and order 2I have been asked this question by my college professor while I was bunking the class.This intriguing question originated from Time Domain Analysis topic in chapter Stability in Frequency Domain of Control Systems
If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?(a) 0 dB(b) 2.0201 dB(c) 4 dB(d) 6.0205 dBThis question was posed to me by my school teacher while I was bunking the class.This intriguing question comes from Nyquist Stability Criterion topic in division Stability in Frequency Domain of Control Systems
The important figures of merit to the system in frequency domain are :(a) Maximum value of resonant peak(b) Value of resonance frequency(c) Maximum value of resonant peak and Value of resonance frequency(d) Minimum value of resonance frequencyI got this question in a national level competition.The above asked question is from Closed-Loop Frequency Response in portion Stability in Frequency Domain of Control Systems
As the polar plot moves toward the point (-1, 0) then the system becomes :(a) Stable(b) Marginally stable(c) Conditionally stable(d) UnstableThis question was addressed to me in final exam.My enquiry is from Assessment of Relative Stability Using Nyquist Criterion topic in section Stability in Frequency Domain of Control Systems

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment