Control Systems
Number of sign changes in the entries in 1st column of Routh array denotes the no. of

 roots of characteristic polynomial in RHP.
 open loop poles in RHP.
 open loop zeroes in RHP.
 zeroes of system in RHP.

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

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

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