Process Engineering Division – Instrumentation and Automation Technology Exchange Forum – Daily Question – Question No. 2020-01-04

2020-01-06View Original

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Process Engineering Section – Instrumentation and Automation Technology Forum – Daily Question – Question No. 2020-01-04: Multiple-choice question: In a single-parameter control system, an air-operated valve with air opening function is denoted as +A, while an air-operated valve with air closing function is denoted as –A. When the control valve is opened, the value of the controlled parameter increases by +B; when it is closed, the value decreases by –B. Then ( ). (Multiple choice) (A) A*B=+, the regulator should be set for positive action; (B) A*B=+, the regulator should be set for negative action; (C) A*B=-, the regulator should be set for positive action; (D) A*B=-, the regulator should be set for negative action. Answer: BC

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Process Engineering Division – Instrumentation and Automation Technology Exchange Forum – Daily Question – Question No. 2020-01-04

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