Control Systems
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 70.7% of the final value
 100% of the final value
 63% of the final value
 50% of the final value

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

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