A unity feedback system has open loop transfer function $$G(s).$$ The steady-state error is zero for

The output of a linear time invariant control system is $$c(t)$$ for a certain input $$r(t).$$ If $$r(t)$$ is modified by passing it through a block whose transfer function is $${e^{ - s}}$$ and then applied to the system, the modified output of the system would be

Introduction of integral action in the forward path of a unity feedback system result in a

For a feedback control system of type $$2,$$ the steady state error for a ramp input is