Chemical Engineering > GATE 2026 > Ziegler-Nichols Tuning
Consider three identical non-interacting first order processes in series, each having unit gain and a time constant of 2 min. Tuning of proportional controller using closed loop Ziegler-Nichols technique is considered. Which one of the following is the ultimate period of sustained cycling (in min per cycle)?
A
4√3π
B
√3π/4
C
4π/√3
D
π/4√3

Correct : c

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Ziegler-Nichols tuning chemical engineering gate first order process series closed loop system ultimate period cycling chemical engineering 2026 GATE 2026 chemical first order process time constant GATE chemical engineering questions

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