Consider the systems with following open loop transfer functions If unity feedback is used, the increasing order of time taken for unit step response to settle is

• 1, 2, 3
• 3, 1, 2
• 2, 3, 1
• 3, 2, 1

Correct Answer: 2, 3, 1

Explanation:

. For the three systems the values of ξω_n are 1.8, 2.5 and 2 respectively.

Hence values of T are 0.55, 0.4 and 0.5 respectively.