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For the unity feedback control system shown in the figure, the open-loop transfer function G(s) is given as G(s) = 2 / (s(s+1)). The steady state error e_ss due to a unit step input is

1. 0
2. 0.5
3. 1.0
4. ∞

Correct answer: 0

Solution

The steady state error for a unity feedback system with a type 1 system (one integrator in the open-loop transfer function) is zero for a unit step input, as the system can perfectly track the input due to its ability to eliminate steady state error.

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