Consider a closed-loop control system where the process to be regulated is an integrating process with a transfer function of 1/(2s). The controller used is an integral controller with a transfer function of 1/(T1s). When a step input is applied to the set point in this system, what type of response will the controlled variable display?

Process Control and Instrumentation MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Process Control and Instrumentationchemical-engineering › process-control-and-instrumentation
Published
5 Mar 2019
Last updated
28 May 2026

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Explanation

In this closed-loop system, the combination of an integrating process and an integral controller results in a characteristic equation that produces complex conjugate poles with negative real parts. This leads to an underdamped response when a step change is introduced in the set point, causing oscillations that gradually settle to the desired value.

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