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A heat exchanger is used to warm the air before inhalation in a Closed Circuit Breathing Apparatus (CCBA).
False
A quick-start system in a CCBA provides immediate oxygen to the user until the chemical canister is activated.
True
In a self-contained breathing apparatus, exhaled air is released into the surrounding atmosphere.
False
CCBAs recycle the unused oxygen from the wearer's inhaled breath.
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A positive pressure system in a breathing apparatus will maintain an internal pressure lower than the external pressure.
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Positive pressure in a CCBA is maintained by using springs on the breathing bag/chamber and a supply valve.
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All breathing apparatus models have instructions for donning and doffing provided by the user, not the manufacturer.
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CCBAs rated up to four hours are suitable for use only in underground mines, not on the surface.
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Air-Purifying Respirators (APRs) supply oxygen for the wearer, reducing the need for oxygen in the atmosphere.
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SCBAs operate on a closed circuit system to provide breathable air to the wearer.
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In a closed-circuit breathing apparatus, exhaled air is recirculated within the system.
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Negative pressure systems in breathing apparatuses have an internal pressure higher than the external pressure.
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SCBAs with open-circuit systems use unfiltered, compressed air.
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SCBAs typically have three regulators in open-circuit systems.
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The demand valve in an SCBA is activated by exhalation.
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SCBAs operate on a closed circuit, meaning exhaled air is recycled back for inhalation.
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The backpack assembly of an SCBA is designed to be carried in the rescuer's hand.
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SCBA air cylinders are rated for 90-120 minutes at pressures between 1,500-3,000 psi.
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The RIC UACs allow for quick charging of SCBA air cylinders.
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The PASS device is manually triggered when the SCBA air is turned on.
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The PASS device provides a visual signal for rescue personnel to locate the wearer.
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Non-built-in models of PASS devices usually require a key to be turned on.
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The duration of an SCBA's air supply is not affected by the user's level of exertion.
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The RIC UAC is a standard fitting dedicated for buddy-breathing purposes.
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In a cascade storage system, the cylinder with the highest usable pressure is always used first.
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A cascade system should never be connected to a purification system and an air compressor approved for breathable air.
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Breathing air cylinders cannot be charged directly from an approved breathable air compressor.
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Oxygen cylinders are recharged by transferring oxygen from low-capacity medical-grade oxygen cylinders via high-pressure pump.
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Hydrostatic testing involves depressurizing a cylinder below its operating pressure to established safety standards.
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The frequency of hydrostatic testing for a compressed cylinder does not depend on the material and model used.
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