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The correct sequence of steps needed to improve system stability is
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- insert derivative action, use negative feedback reduce gain
- reduce gain, use negative feedback, insert derivation action
- reduce gain, insert derivation action, use negative feedback
- use negative feedback, reduce gain, insert derivation action
Correct Option: D
Since all the coefficients in all the three polynomials are positive, it is required to construct Hurwitz table for further checking.
1. s4 + 7s3 + 17s2 + 17s + 6
This is seen to be a Hurwitz polynomial as all the terms in the first column have the same sign.
2. s4 + 11s3 + 41s2 + 61s + 30
This also is a Hurwitz polynomial
3. s4 + s3 + 2s2 + 3s + 2
This is not a Hurwitz polynomial
