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

 arithmetic mean
None of these
 geometric mean
 either 1 or 2

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Control Systems
Find the conditions for the system to be stable?

 Gain margin and phase margins are positive
 Gain margin is negative but phase margin is positive
 Gain margin is positive but phase margin is negative
 Gain margin and phase margins are negative

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