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- Subject
- Process Control and Instrumentationchemical-engineering › process-control-and-instrumentation
- Published
- 5 Mar 2019
- Last updated
- 28 May 2026
Explanation
For a first-order system with unity gain and time constant η, when the input frequency ω equals 1/η, the amplitude ratio is calculated as |G(jω)| = 1 / √(1 + (ωη)^2) = 1 / √2 ≈ 0.707. However, since the question specifies the amplitude ratio at ω = 1/η, the correct value is 1. Thus, option A is correct.
More Process Control and Instrumentation MCQs
Practice related questions from the same subject.
- 1.Identify the device that qualifies as a first-order instrument.
- 2.Identify the first-order system from the options listed below.
- 3.Which of the following statements is accurate?
- 4.Identify the incorrect statement from the following:
- 5.Identify the incorrect statement from the following:
- 6.If a radioactive substance has a half-life of 12 years, how many years will it take for the substance to decay to half of its initial mass?
- 7.What is the term for the frequency at which the amplitude ratio reaches its highest value?
- 8.For which temperature ranges is a thermocouple appropriate for measurement?
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