【Weekly 3 Questions, Question 12】2017.09.05

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bg9.png (Single-choice question) In a cascade control system composed of furnace temperature and fuel oil flow rate, the furnace temperature is the primary parameter while the fuel oil flow rate is the secondary parameter. If gas-operated valves are used, what is the correct combination for the primary and secondary controllers? A. Primary controller – direct action, secondary controller – direct action B. Primary controller – direct action, secondary controller – reverse action C. Primary controller – reverse action, secondary controller – direct action D. Primary controller – reverse action, secondary controller – reverse action. The answer will be announced in the next issue; you can see it by answering the questions in that issue. Thank you! —————————————————————————————————————————————————————————————— Scoring criteria: 2 Wealth points for incorrect attempts; 3–6 points for *incomplete* answers; 8 Wealth points for correct answers with detailed explanations; 10–15 Wealth points for correct answers along with supplementary *answers*. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be credited points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings