Question

A system for which the steady state error is zero for a unit-step is of type (A) Zero (B) 1 (C)2 (D) 1 or 2 (E) none of above

Answer 1

(E) 1 or 2

Step-by-step explanation:

Steady state error for unit step input is given by
`e_(ss)=(1)/(1+k_p)` where
`K_P` is position error coefficient the value of
`K_P` is given by
`k_p=\lim_(s\rightarrow 0)G(s)` it will be only finite when the type of the open loop system will be 0 when the of the system will be 1 or 2 then
`k_p` becomes infinite and steady state error will become zero so the option (E) will be the correct answer