Control Systems
The output of the system has an effect upon the input quantity, then the system is a

 closed loop control system.
None of these
 either 1 or 2.
 open loop control system.

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

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