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The open-loop transfer function of a unity feedback control system is: G(s) = 1/(s + 2)2 The closed loop transfer function will have poles at—
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- – 2, – 2
- – 2, – 1
- – 2, ± j1
- – 2, ± j2
- – 2, – 2
Correct Option: C
| Given that G(s) = | ||
| (s + 2)2 |
| M(s) = | (∴ H(s) = 1) | ||
| 1 + G(s)H(s) |
| ∴ M(s) = | = | |||
| 1 + G(s) | 1 + (1/s + 2)2 |
= 1/(s + 2)2 + 1
The poles are at – 2 ± j1
