30 Questions
What is the best solution to a dangerous atmosphere according to the text?
Proper and adequate ventilation
When should proper respiratory equipment be used according to the text?
If an area cannot be ventilated and lives or property are at risk
What does the chapter emphasize as crucial for mine rescue team members?
Using suitable protective equipment in hazardous environments
Why might people exposed to a dangerous atmosphere not be aware of the need to protect themselves?
They lack the necessary training
What can selecting the right protective equipment mean according to Chapter 8?
Difference between life and death
Where should trainees refer for a comprehensive overview of breathing apparatus care and use?
Manufacturer’s guidelines and site-specific procedures
What is the purpose of the first-stage regulator in an open-circuit SCBA?
To reduce the pressure of the compressed air in the cylinder
How does the exhaled breath exit the SCBA facepiece in an open-circuit system?
Via the exhalation valve to the outside atmosphere
What is the function of the purge/bypass valves in SCBAs?
To provide emergency air flow in case of regulator failure
Which component of the SCBA is responsible for delivering low-pressure air into the mouth and nose of the rescuer?
Facepiece (mask)
What is the purpose of the second-stage regulator in an open-circuit SCBA?
To reduce compressed air pressure to a level just above atmospheric pressure
What is the main function of the backpack assembly in an SCBA?
To hold the air cylinder on the rescuer’s back
What is the primary function of a self-contained breathing apparatus?
To supply breathable air from a cylinder or through a chemical reaction
In a closed-circuit breathing apparatus, what happens to exhaled air?
It is recirculated within the system
What is a characteristic of a positive pressure system in a breathing apparatus?
Maintains an internal pressure higher than the external pressure
Why do manufacturers provide instructions for donning and doffing breathing apparatuses?
To guide proper usage and removal of the apparatus
What is the primary function of Air-Purifying Respirators (APRs)?
To remove contaminants in the air by filtering out particulates and gases
What percentage of oxygen in the atmosphere is necessary for Air-Purifying Respirators to be used effectively?
19.5%
What is a common hazardous atmosphere that can lead to lung and respiratory tract injuries?
Toxic gases or vapours
What is the danger of inhaling heated gases in hazardous scenarios?
Causing fluid collection in the lungs leading to asphyxiation
Why is the damage from hot air not immediately reversible by introducing fresh, cool air?
Fresh air cannot reach the affected areas quickly enough
What is the function of a non-self-contained breathing apparatus in the presence of carbon monoxide?
Requires adequate oxygen in the atmosphere to function properly
Why is it stated that the lungs and respiratory tract are more vulnerable to injury from hazardous atmospheres?
Because they lack protective mechanisms
In mine rescue operations, what kind of breathing apparatus uses oxygen from the atmosphere drawn through a filter?
Open-circuit breathing apparatus
What is the minimum percentage of oxygen required in the air for the W65 self-rescuer to function?
19.5%
How long can the W65 self-rescuer protect the wearer against carbon monoxide at 1% (10,000 PPM) concentration?
One hour
What happens when the W65 self-rescuer is exposed to higher levels of carbon monoxide?
It generates heat and reduces its duration
How long is the shelf life of the W65 self-rescuer when properly stored?
15 years
What is the purpose of the check valve in the respirator?
To prevent outside air from entering back into the respirator
What is the function of the breathing bag in oxygen-generating self-rescuers?
To serve as a breathing air reservoir
This quiz covers the functioning of self-contained breathing apparatus, including open-circuit and closed-circuit systems, as well as positive pressure versus negative pressure systems. Learn about how breathable air is supplied and the differences in exhaled air management.
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