Question 4 For the system shown in Figure 4a whose frequency response curves for G and G have been experimentally determined in Figure 4b, (a) Construct the asymptotic Bode magnitude plot of open-loop transfer function G = GG2; (b) Determine the open-loop transfer function G-G1G2; (c) Find the gain cross-over frequency from the asymptotic Bode magnitude plot of the open-loop transfer function. + 25 G(s) G(s) (a) RMIT Classification: Trusted 20 15 10 5 0 -5 -10 -15 -20 -25 0.01 0.1 1 Figure 4 (b) 10 100 G1 G2