Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 marginally stable
 stable
 critical stable
 unstable

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

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

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