Question 25 of 30
During a shipboard firefighting operation, what is the primary purpose of a positive pressure breathing apparatus (PPBA)?
A
A) To supply fresh air to the compartment
B
B) To prevent smoke from entering the mask
C
C) To maintain positive pressure inside the mask
D
D) To enhance communication among firefighters
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Answer & Explanation
The correct answer is Option C: C) To maintain positive pressure inside the mask.
A positive pressure breathing apparatus (PPBA) maintains a slightly higher pressure inside the mask than the ambient pressure. This crucial feature prevents toxic smoke or gases from leaking into the mask, even with minor seal imperfections, ensuring the wearer breathes only clean, supplied air.