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

 unstable
 critical stable
 marginally stable
 stable

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

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