Which of the systems having following transfer functions is stable?

$$\frac{1}{{{{\text{s}}^2} + 2}}$$

$$\frac{1}{{{{\text{s}}^2} - 2{\text{s}} + 3}}$$

$$\frac{1}{{{{\text{s}}^2} + 2{\text{s}} + 2}}$$

$$\frac{{{\text{exp}}\left( { - 20{\text{s}}} \right)}}{{{{\text{s}}^2} + 2{\text{s}} - 1}}$$

Which of the systems having following transfer functions is stable? Correct Answer $$\frac{1}{{{{\text{s}}^2} + 2{\text{s}} + 2}}$$

Bissoy MCQ Team

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