Control Systems
The maximum phase lag occurs at the ------------------- of the two corner frequencies?

 geometric mean
 arithmetic mean
 either 1 or 2
None of these

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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 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.
 each system in the cascade is individually caused and unstable.

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