Question 924 Deck Safety

70% to pass

When the alarm bell sounds on a positive-pressure, self-contained breathing apparatus, how long will reserve air supply last?

A About 4-5 minutes
B About 12-15 minutes
C About 18-20 minutes
D About 8-10 minutes
AI Explanation

The correct answer is A) About 4-5 minutes. When the alarm bell sounds on a positive-pressure, self-contained breathing apparatus (SCBA), it indicates that the user's reserve air supply is low, typically around 25% of the total capacity. Regulations require SCBA units to have a minimum reserve air supply of 4-5 minutes to allow the user to safely exit the hazardous environment. The other options are incorrect because they do not align with the standard reserve air supply requirements for SCBA units.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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