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Questions and Answers
A heat exchanger is used to warm the air before inhalation in a Closed Circuit Breathing Apparatus (CCBA).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
SCBAs with open-circuit systems use unfiltered, compressed air.
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SCBAs typically have three regulators in open-circuit systems.
SCBAs typically have three regulators in open-circuit systems.
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The demand valve in an SCBA is activated by exhalation.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
The frequency of hydrostatic testing for a compressed cylinder does not depend on the material and model used.
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