Control Systems
The open loop transfer function of a unity feedback control system is G(s) = 1/((s(s+0.1s)(s+1)). The value of damping factor for which the resonant peek is equal to 1.4 is

 0.386
 0.707
 0.263
 0.953

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Control Systems
When deriving the transfer function of linear element

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

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