Q3) A feedback control system has the structure shown in the figure. Determine the closed-loop transfer function Y(s)/R(s).
Q4) Consider the following DC motor mechanical system, where ea(t) is the applied armature voltage and em(t) is the back electrical and magnetic field voltage.
a) Draw free body diagrams of "J" and "m".
b) Find the Laplace transformation equations of I(s), T(s), Em(s), and O(s), X(s).
c) Draw a block diagram of the above system.
d) Find the system transfer function O(s)/Ea(s).