Consider the unity feedback system with open loop transfer function the minimum value of the steady state error to a ramp input r(t) = 6tu(t) is OLTF = K/s(s+1)(s+2)
(a) 1
(b) 2
(c) 3
(d) 4
The question was asked in an international level competition.
My question is based upon Steady-state Errors and Error Constants topic in division Time Response Analysis, Design Specifications and Performance Indices of Control Systems