Identify the respiratory protection that is an SCBA.

• A. SAR (open circuit supplied air respirators)
• B. PAPR filter
• C. SCBA (open circuit self contained breathing apparatus)
• D. NIOSH respirator

Answer: (C)

The main idea here is recognizing a device that carries its own air supply. An SCBA, or self-contained breathing apparatus, provides breathable air from a portable cylinder worn by the user, so the wearer is not dependent on the ambient air. Because it’s open circuit, the exhaled air is released to the surroundings rather than recycled. This distinguishes it from other options: a supplied-air respirator feeds air from a distant source through a hose, a powered air-purifying respirator uses filters to clean ambient air, and a NIOSH respirator refers to rating standards rather than a specific breathing apparatus. So the one that is an SCBA is the open-circuit self-contained breathing apparatus.