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

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

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Control Systems
When deriving the transfer function of linear element

 both initial conditions and loading are taken into account.
 initial conditions are assumed to be zero but loading is taken into account.
 initial conditions are assumed to be zero and the element is assumed to be not loaded.
 initial conditions are taken into account but the element is assumed to be not loaded.

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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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