Control Systems
If two blocks having gains A and B respectively are in series connection, find the resultant gain using block diagram reduction technique?

 A-B
 A+B
 A*B
 A/B

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

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