Which of the systems having the following transfer function is stable ?
Correct answer: C. 1/(S2 + 2S + 2)
- A. 1/(S2 + 2)
- B. 1/(S2 - 2S + 3)
- C. 1/(S2 + 2S + 2)
- D. exp (-20 S)/(S2 + 2S - 1)
Explanation
A continuous system is stable when all poles lie in the left half of the s-plane. For s² + 2s + 2, both poles have negative real parts, while the other denominators include right-half-plane or imaginary-axis poles.
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