Control Systems Objective Questions & Answers
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The open loop transfer function of non unity negative feedback system is G(s) = ks/((s+1)(s+2)), then the number of root locus branches equal to
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Find the conditions for the system to be stable?
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A second order system has peak over shoot = 50% and period of oscillations 0.2 seconds. Find the resonant frequency?
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Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?
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Negative feedback in a closed loop control system
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Find the bandwidth of the system, when rise time of the system is give as 1msec?
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A transfer function is given as G(s) = (s²+9)(s+2)/(s+4)(s+3)(s+9) The steady state sinusoidal response will become zero at a frequency response is
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In frequency response analysis of second order system, the error at corner frequency is
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Find the relation of damped natural frequency (ω_{d})
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The open loop transfer function of a unity feedback control system is G(s) = 1/((s(s+0.1s)(s+1)). The value of damping factor for which the resonant peek is equal to 1.4 is
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A second order system has F(jω) = 100/(100  ω² + 10√2 jω). Find the resonant peak?
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The Laplace transform of a transportation lag of 5 seconds is e^{5s}
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If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?
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The value of 'a' to give phase margin = 45° will be G(s) = (as+1)/s²
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The magnitude of a transfer function G(jω)H(jω) at gain cross over frequency is
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The phase margin of a system having the loop transfer function G(s)H(s) = 2√3/s(s+1) is
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The lag compensator
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The characteristic equation for closed loop system is given as s³ + 2s² + 4s + k = 0. The value of k for which the system becomes just stable is
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If the bandwidth of the system is very large, the system response is
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A unity feedback control system has forward loop transfer function as e^{Ts}/s(s+1). Its phase value will be zero at frequency ω1. Which of the following equations should be satisfied by ω_{1}?
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the closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is
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A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is
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For a second order under damped system subjected to unit step input the time response has first peak value to be 4 times the second over shoot. Determine the damping ratio ξ ?
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A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?
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Which of the following represents the value of resonant frequency (ω_{r})?
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A property of phase lead compensation is that the
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In polar plots if the critical point '1+j0' is enclosed then the system is 
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The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is
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Resonant peak of a marginally stable system is
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The closed loop transfer function of a system is 25/(s² + 25). The settling time of the system is
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