1. The control system is stable if, a. One root of characteristic equation is located on imaginary axis. b. one root is located at the right of complex axis. c. one root is located at the left of complex axis. d. One root of characteristic equation is located on imaginary axis and at the right of complex axis. 2. The characteristic equation of a system is given as, 3s4+10s3+5s2+2=0. This system is : a. Stable b. on converge of stability. c. Unstable d. Linear 3. The characteristic equation of the negative feedback transfer function is: a. G(s) b. 1-G(s) c. 12G(s) d. 1+G(s) 4. The elements of 3rd row of Routh array are: a. Odd coefficients of characteristic equation. b. Fiven coefficiens ol characteristic equation. c. 1rement is odd and orhers are even. 5. Static error is a. Steady state crrot b. Error as function of time, c. Both (a) and (b) d. Neither (a) nor (b) 6. For type one systern: a. Number of zcroes al origin are one. b. Number of poles at urigin are one: c. Number of zcrocs at origin are zero. d. Number of polcs at origin are LtTo. 7. The steady state error for transfer function, G(s)=500/[(s+24)(s2+ 8s+14)] in a control system subjected to R(t)=30u(t) is: a. 0 b. Infinity c. 12 d. 50 8. The roots of the characteristic equation, s2+3s+5=0 are a. On the left side of s-plane. b. On the origin c. On the left side of s-plane d. On imaginary axis. (12 Marks) For the following summing point, find false signal: a. C=BA b. A=C+B c. B=A+C d. A=BC