In a self-contained closed-circuit breathing apparatus, which statement is true regarding the exhaled air? A) the exhaled air is released outside the apparatus. B) the exhaled air... In a self-contained closed-circuit breathing apparatus, which statement is true regarding the exhaled air? A) the exhaled air is released outside the apparatus. B) the exhaled air is wholly absorbed within the apparatus. C) CO2 is released outside the apparatus after separating from exhaled air. D) CO2 from exhaled air is absorbed with a chemical. A rectangular mine airway of 2.0 m width and 2.5 m height has a deflection of π/4 radians. If the radius of curvature of the bend is 4 m, what is the factor of the bend (round off to three decimals)?
Understand the Problem
The question consists of two parts: Q.12 asks about the mechanics of a closed-circuit breathing apparatus and its air handling, while Q.13 requires calculating a factor related to the curvature of a mine airway based on given dimensions. Both questions are likely from a science or engineering context.
Answer
D) CO2 from exhaled air is absorbed with a chemical.
The final answer is D) CO2 from exhaled air is absorbed with a chemical.
Answer for screen readers
The final answer is D) CO2 from exhaled air is absorbed with a chemical.
More Information
In a closed-circuit breathing apparatus, CO2 from exhaled air is absorbed by chemical scrubbers, allowing oxygen to be reused by the wearer.
Tips
A common mistake is thinking exhaled air or CO2 is released outside the apparatus, which is not true for closed-circuit systems.
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