A unity feedback control system has forward loop transfer function as e-Ts/s(s+1).
Its phase value will be zero at frequency ω1.
Which of the following equations should be satisfied by ω1?
A. ω1 = tan(Tω1)
B. ω1 = cot(Tω1)
C. Tω1 = cot(ω1)
D. Tω1 = tan(ω1)
Show Answer
Answer: B
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