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Q1:

The given characteristic polynomial s4 + s3 + 2s2 + 2s + 3 = 0 has

A zero root in RHS of s-plane

B one root in RHS of s-plane

C two roots in RHS of s-plane

D three roots in RHS of s-plane

ANS:C - two roots in RHS of s-plane

By Routh's Array When ε -> 0, two sign changes in the first column, so there are two roots in RHS plane.



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