Self-Contained Breathing Apparatus Overview
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Questions and Answers

What is the best solution to a dangerous atmosphere according to the text?

  • Using personal protective equipment
  • Ignoring the danger
  • Rushing into the area to rescue others
  • Proper and adequate ventilation (correct)

    • When should proper respiratory equipment be used according to the text?

  • Only in the presence of fire
  • During routine mine inspections
  • When there is adequate ventilation
  • If an area cannot be ventilated and lives or property are at risk (correct)

    • What does the chapter emphasize as crucial for mine rescue team members?

  • Knowing when to evacuate immediately
  • Using suitable protective equipment in hazardous environments (correct)
  • Being unaware of the danger around them
  • Underestimating the danger in the atmosphere

    • Why might people exposed to a dangerous atmosphere not be aware of the need to protect themselves?

    <p>They lack the necessary training</p> Signup and view all the answers

    What can selecting the right protective equipment mean according to Chapter 8?

    <p>Difference between life and death</p> Signup and view all the answers

    Where should trainees refer for a comprehensive overview of breathing apparatus care and use?

    <p>Manufacturer’s guidelines and site-specific procedures</p> Signup and view all the answers

    What is the purpose of the first-stage regulator in an open-circuit SCBA?

    <p>To reduce the pressure of the compressed air in the cylinder</p> Signup and view all the answers

    How does the exhaled breath exit the SCBA facepiece in an open-circuit system?

    <p>Via the exhalation valve to the outside atmosphere</p> Signup and view all the answers

    What is the function of the purge/bypass valves in SCBAs?

    <p>To provide emergency air flow in case of regulator failure</p> Signup and view all the answers

    Which component of the SCBA is responsible for delivering low-pressure air into the mouth and nose of the rescuer?

    <p>Facepiece (mask)</p> Signup and view all the answers

    What is the purpose of the second-stage regulator in an open-circuit SCBA?

    <p>To reduce compressed air pressure to a level just above atmospheric pressure</p> Signup and view all the answers

    What is the main function of the backpack assembly in an SCBA?

    <p>To hold the air cylinder on the rescuer’s back</p> Signup and view all the answers

    What is the primary function of a self-contained breathing apparatus?

    <p>To supply breathable air from a cylinder or through a chemical reaction</p> Signup and view all the answers

    In a closed-circuit breathing apparatus, what happens to exhaled air?

    <p>It is recirculated within the system</p> Signup and view all the answers

    What is a characteristic of a positive pressure system in a breathing apparatus?

    <p>Maintains an internal pressure higher than the external pressure</p> Signup and view all the answers

    Why do manufacturers provide instructions for donning and doffing breathing apparatuses?

    <p>To guide proper usage and removal of the apparatus</p> Signup and view all the answers

    What is the primary function of Air-Purifying Respirators (APRs)?

    <p>To remove contaminants in the air by filtering out particulates and gases</p> Signup and view all the answers

    What percentage of oxygen in the atmosphere is necessary for Air-Purifying Respirators to be used effectively?

    <p>19.5%</p> Signup and view all the answers

    What is a common hazardous atmosphere that can lead to lung and respiratory tract injuries?

    <p>Toxic gases or vapours</p> Signup and view all the answers

    What is the danger of inhaling heated gases in hazardous scenarios?

    <p>Causing fluid collection in the lungs leading to asphyxiation</p> Signup and view all the answers

    Why is the damage from hot air not immediately reversible by introducing fresh, cool air?

    <p>Fresh air cannot reach the affected areas quickly enough</p> Signup and view all the answers

    What is the function of a non-self-contained breathing apparatus in the presence of carbon monoxide?

    <p>Requires adequate oxygen in the atmosphere to function properly</p> Signup and view all the answers

    Why is it stated that the lungs and respiratory tract are more vulnerable to injury from hazardous atmospheres?

    <p>Because they lack protective mechanisms</p> Signup and view all the answers

    In mine rescue operations, what kind of breathing apparatus uses oxygen from the atmosphere drawn through a filter?

    <p>Open-circuit breathing apparatus</p> Signup and view all the answers

    What is the minimum percentage of oxygen required in the air for the W65 self-rescuer to function?

    <p>19.5%</p> Signup and view all the answers

    How long can the W65 self-rescuer protect the wearer against carbon monoxide at 1% (10,000 PPM) concentration?

    <p>One hour</p> Signup and view all the answers

    What happens when the W65 self-rescuer is exposed to higher levels of carbon monoxide?

    <p>It generates heat and reduces its duration</p> Signup and view all the answers

    How long is the shelf life of the W65 self-rescuer when properly stored?

    <p>15 years</p> Signup and view all the answers

    What is the purpose of the check valve in the respirator?

    <p>To prevent outside air from entering back into the respirator</p> Signup and view all the answers

    What is the function of the breathing bag in oxygen-generating self-rescuers?

    <p>To serve as a breathing air reservoir</p> Signup and view all the answers

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