Chemical Engineering > GATE 2021 > Control System Stability
Which of the following is NOT a necessary condition for a process under closed-loop control to be stable?
A
Dead-time term(s) must be absent in the open-loop transfer function
B
Roots of the characteristic equation must have negative real part
C
All the elements in the left (first) column of the Routh array must have the same sign
D
Open-loop transfer function must have an amplitude ratio less than 1 at the critical frequency

Correct : a

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