Question 621General Subjects - Assistant Engineer
70% to passWhich of the following refrigerants which may be found aboard ship is designated as an ozone-depleting substance as defined in the Montreal Protocol on Substances that Deplete the Ozone Layer and is controlled as a result?
AR-12
BR-134a
CR-404A
DR-410A
AI Explanation
The correct answer is A) R-12. R-12 (Dichlorodifluoromethane) is designated as an ozone-depleting substance under the Montreal Protocol and is controlled as a result. The Montreal Protocol, an international agreement to protect the ozone layer, has phased out the production and use of ozone-depleting substances like R-12. In contrast, R-134a, R-404A, and R-410A are not ozone-depleting substances and are not controlled under the Montreal Protocol.
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