Control Systems
For a second order under damped system subjected to unit step input the time response has first peak value to be 4 times the second over shoot. Determine the damping ratio ξ ?

 0.87
 0.087
 0.07
 0.707

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Control Systems
When deriving the transfer function of linear element

 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.
 initial conditions are assumed to be zero but loading is taken into account.
 both initial conditions and loading are taken into account.

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