Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 -90°
 -180°
 180°
 90°

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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 taken into account but the element is assumed to be not loaded.
 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.

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