Frequency Domain Analysis » Exercise - 111. The gain margin of a system is 0 dB. It represent a : (a) stable system (b) unstable system (c) conditionally stable system (d) marginally stable system
Frequency Domain Analysis » Exercise - 122. At the phase crossover frequency, ω =10 rad/s,│G(j ω)H(j ω) │= -8 dB. The system is : (a) stable (b) unstable (c) conditionally stable (d) cannot be predicted
Frequency Domain Analysis » Exercise - 125. At the phase crossover frequency, ω =5 rad/s,│G(jω)H(j ω) │= 10 dB. The system is : (a) stable (b) unstable (c) conditionally stable (d) cannot be predicted
Frequency Domain Analysis » Exercise - 1 20. For a second – order system, ωn = 8 and ξ= 0.5. The value of ωr in rad/s is : (a) 4.657 (b) 5.657 (c) 6.657 (d) none of these
Frequency Domain Analysis » Exercise - 1 1. The magnitude-frequency response of a control system is shown in the figure. The value of ω1 and ω2 are respectively : (a) 10 and 200 (b) 20 and 200 (c) 20 and 400 (d) 100 and 400