Question 929 Deck Safety

70% to pass

After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean?

A The air supply hose has a leak.
B The unit is working properly.
C The air bottle needs to be refilled.
D The face mask is not sealed properly.
AI Explanation

The correct answer is C) The air bottle needs to be refilled. The continuous ringing of a bell after opening the air supply indicates that the air pressure in the bottle is getting low, signaling that the bottle needs to be refilled. This is a safety feature built into self-contained breathing apparatus (SCBA) to alert the user when the air supply is running low. The other options are incorrect because: A) A leak in the air supply hose would cause the pressure to drop, but it would not trigger the low-pressure alarm bell. B) The unit working properly would not cause the bell to continuously ring. D) A poorly sealed face mask would not activate the low-pressure alarm bell specifically.

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