55 ) Consider a feedback control system in Fig and the Gollowing transfer functions: Gc= Kc ( 1 + 1/s) ; Gm = st - Gul, Gp=Gd - Se 2s CIOst) (a) Plot the bode diagram for the oper-loop transfer and tabulate the amplitude ratio and phase lag us frequency . (6) For what values of Kc is the system stable ? (c) If Keo 0.2, what is the phase nargin (d) what value of ke will result in a gain margin of 1.7? D=0 Gd Yd E Grach GO YM (crive proper handwritter solution)