Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 1/(s² + 5 + 1)
 1/(s+1)(s+5)
 5/(s² + 5 + 1)
 5/(s+1)(s+5)

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Control Systems
Find the conditions for the system to be stable?

 Gain margin and phase margins are negative
 Gain margin is negative but phase margin is positive
 Gain margin and phase margins are positive
 Gain margin is positive but phase margin is negative

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