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Tension

A process exh...

Question

A process exhibits oscillations for a critical gain setting of 10 in a time period of 30 minute. The setting of ziegler-Nichols for $P + I$ controller mode respectively are:

k_{p} = 4.5, T_{i} = 25 m i n

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k_{p} = 6, T_{i} = 25 m i n

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k_{p} = 5, T_{i} = 25 m i n

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k_{p} = 6, T_{i} = 15 m i n

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Solution

The correct option is A $k_{p} = 4.5, T_{i} = 25 m i n$
For $P + I$ mode

$k_{p} = 0.45 k_{c}$

$k_{P} = 0.45 \times 10 = 4.5$

$T_{i} = \frac{T_{C}}{1.2} = \frac{30}{1.2} = 25 m i n$

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