Methanol Purified Version Safety Question 20200607
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According to the concept of intrinsically safe design, ( ) are safety measures taken from an intrinsically safe perspective. A. A light-controlled power-off device installed on cutting machinery B. Airbags installed in cars C. Satellite trackers provided for explorers D. Self-rescue devices worn by coal miners A
A. Light-controlled power-off device installed on the cutting machine
Answer: A 【Explanation】 Intrinsic safety refers to making production equipment or systems safe through design and other means, so that accidents do not occur even in the event of misoperation or failures. It includes two aspects: ① Errors – safety functions ； ②Fault – safety function. The above two safety functions should be inherent in the equipment, facilities, and technical processes themselves, that is, they should be incorporated during their planning and design phase, rather than being added as a remedial measure later on. The light-controlled power-off device installed on the cutting machine was incorporated during the design phase and is a safety measure taken from the perspective of intrinsic safety ； All three of BCD are post-compensation measures and do not constitute intrinsic safety measures.