Control Systems Objective Questions & Answers – Set 7

A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?

Which of the following represents the value of resonant frequency (ω_r)?

A second order system has peak over shoot = 50% and period of oscillations 0.2 seconds. Find the resonant frequency?

Negative feedback in a closed loop control system

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 ?

In polar plots if the critical point '-1+j0' is enclosed then the system is --------

Find the bandwidth of the system, when rise time of the system is give as 1msec?

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

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

the closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

The Laplace transform of a transportation lag of 5 seconds is e^-5s

If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?

The value of 'a' to give phase margin = 45° will be G(s) = (as+1)/s²

A second order system has F(jω) = 100/(100 - ω² + 10√2 jω). Find the resonant peak?

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

If the bandwidth of the system is very large, the system response is

Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?

Find the relation of damped natural frequency (ω_d)

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

In frequency response analysis of second order system, the error at corner frequency is

The phase margin of a system having the loop transfer function G(s)H(s) = 2√3/s(s+1) is

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 ω₁?

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

A property of phase lead compensation is that the

The magnitude of a transfer function G(jω)H(jω) at gain cross over frequency is

Resonant peak of a marginally stable system is

The lag compensator

The closed loop transfer function of a system is 25/(s² + 25). The settling time of the system is

Find the conditions for the system to be stable?

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