Control Systems
The system is initially critical damped. If the gain of the system is doubled, then it will exhibit

 critical damped characteristics.
 over damped characteristics.
 under damped characteristics.
 undamped characteristics.

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

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

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