Sketch the complete Nyquist plot and interpret stability therefrom for the systems with following loop transmittances.

(a) \(\mathrm{G}_{1}(s)=\frac{4 s+1}{s^{2}(s+1)(2 s+1)}\)

(b) \(\mathrm{G}_{2}(s)=\frac{1}{s^{4}(s+\alpha)}\)