Automatic Control Systems - Engineering

Q1:

An open loop system has a forward path transfer function (42.25)/s(s + 6.5). The unit step response of the system starting from rest will have its maximum value at a time equal to

A 0 sec

B 0.56 sec

C 5.6 sec

D infinity

ANS:D - infinity

Unit step response is Taking inverse transform, the time domain response is - 1 + 6.5t + e-6-5t. It reaches maximum value at t = infinity.