Question 28 of 30
Which of the following conditions represents a particular advantage of using a positive pressure type self-contained breathing apparatus in an atmosphere that is immediately dangerous to life or health?
A
The equipment is compact and the wearer can work in confined spaces without difficulty.
B
The equipment used is lightweight and easy to wear by reducing physical strain on the wearer.
C
The average operating time for most air cylinders is over an hour.
D
The positive pressure in the face piece prevents contaminated air from entering the face piece.
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Answer & Explanation
The correct answer is Option D: The positive pressure in the face piece prevents contaminated air from entering the face piece..
Positive pressure SCBAs maintain a slightly higher pressure inside the mask than the surrounding environment. This design ensures that if there is a minor seal failure, air leaks out instead of allowing toxic air in.