USCG USCG General Eng
Set 10 • Question #43 of 498
Launch Interactive Practice Room R-12 is generally considered to be a safe, nontoxic, nonflammable, and nonexplosive refrigerant. It can, however, become highly toxic when __________.
A
superheated outside the system
B
in contact with an open flame
✓ Correct Answer
C
heated to the boiling point
D
all of the above
USCG NMC Regulatory Explanation
In USCG Marine Engineering General Subjects, for engine room systems involving 'R-12 is generally considered to be a safe, nontoxic, nonflammable, and nonexplosive refrigerant. It can, however, become highly toxic when', the standard operating requirement is: 'in contact with an open flame'.
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