Soar to New Heights with the 2025 Commercial Pilot License (CPL) Practice Exam – Ready for Takeoff!

The purpose of a continuous flow oxygen mask is primarily to maintain blood oxygen levels, especially in situations where the ambient oxygen levels are decreased, such as at high altitudes. These masks provide a constant flow of oxygen to the user, ensuring that sufficient oxygen is available to prevent hypoxia, which is a lack of adequate oxygen in the body. The continuous flow feature allows for a steady supply without the user needing to inhale deeply or worry about the timing of oxygen delivery, which is crucial during critical phases of flight when every second matters.

Other choices focus on functions that do not align with the primary role of the continuous flow oxygen mask; for example, filtering pollutants is not a function of the mask itself but rather pertains to the overall air quality in the cabin. Reducing cabin pressure is a separate aspect related to aircraft cabin safety and design, and supplying pressurized air is unrelated to the specific purpose of the oxygen mask in providing supplemental oxygen to maintain physiological needs during flight.