Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 zero
 unity
 infinite
 0.707

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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 negative
 Gain margin and phase margins are positive

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