Mechatronics: Electronic Control Systems In Mechanical and Electrical Engineering, 7th Edition by Pearson

GATE Questions

1. A control system is said to be stable if
   1. all the poles of its transfer function lie in the left half of the s-plane
   2. all the poles and zeros of its transfer function lie in the left half of the s-plane
   3. all the poles of its transfer function lie on the imaginary axis
   4. all the poles and zeros of its transfer function lie on the imaginary axis

   Answer: (a)

2. The root locus of the transfer function G(s)H(s) = K/(s + 1)(s + 2)(s + 3) will have breakaway/break-in points at
   1. −1 and −2
   2. −2 and −3
   3. −1 and −3
   4. None of the above

   Answer: (c)

3. The transfer function of a system is G(s) = (s + 2)/ (s + 3). The steady-state error of the system due to a unit step input is
   1. 0
   2. 1/3
   3. 2/3
   4. 1

   Answer: (b)

4. The open-loop transfer function of a unity feedback ...