SSC JE Electrical Engineering 2017 Set 1 Paper

Question : 162 of 200

Marks: +1, -0

Transfer function of a system is G(s) = K/[s

^2

(1 + sT)]. This open-loop system is _____

Solution:

G (S)=K/ {S ^2(1+ S_T)}

System is unstable.
because denominator does not follow Routh Hurwitz Rule

{S^2}_t+{S^2}_T=0

Missing turn of S'. So it is not follow Routh Hurwitz Rule and unstable.

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