Electrical Engineering: Control system MCQ

In the system whose signal flow graph is shown in the figure. U 1 (s) and U 2 (s) are inputs. The transfer function Y(s) / U₁(s) is

The transfer function of the system Y(s)/U(s) whose state-space equations are given below is:

For the closed -loop system shown,the transfer function E(S) / R(S) is 

In the open interval (0 , 1), the polynomial p(x) = x⁴ – 4x³ + 2 has

For a system having transfer function G(s) = -s+1 / s+1 , a unit step input is applied at time t = 0. The value of the response of the system at t = 1.5 sec (rounded off to three decimal places) is ___________