Control Systems
A second order control system has a transfer function 16/(s² + 4s + 16). What is the time for the first overshoot?

 π/2√3 sec
 π/√3 sec
 2π/√3 sec
 π/4√3 sec

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 at least one system is unstable and at least one system is causal.
 the majority are unstable and the majority are causal.
 each system in the cascade is individually caused and unstable.
 at least one system is causal and all systems are unstable.

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