Atmospheric Hazards During and After Fires
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Questions and Answers

What is the primary goal of Intrinsic Safety design?

  • To limit energy to prevent ignition of hazardous atmospheric mixtures (correct)
  • To detect toxic gases in emergency response situations
  • To provide direct-reading instruments for mine rescue gas detection
  • To provide personal protective equipment for hazardous locations

    • What category of hazardous atmospheres includes oxygen deficiency and asphyxiating gases?

  • Oxygen deficiency/Asphyxiating gases (correct)
  • Smoke, aerosols, fumes
  • Toxic
  • Explosive/flammable gases or vapours

    • What type of instruments are used in mine rescue gas detection?

  • Indirect-reading instruments
  • Direct-reading instruments (correct)
  • Remote-reading instruments
  • Intrinsically safe instruments

    • What is the importance of selecting gas detection equipment?

    <p>To fit the specific needs of the incident</p> Signup and view all the answers

    What should be considered before any gas testing?

    <p>All personal protective equipment</p> Signup and view all the answers

    What is the primary benefit of direct-reading instruments in mine rescue gas detection?

    <p>They enable rapid decision-making</p> Signup and view all the answers

    What is the most immediate hazard to life during and after fires in mines?

    <p>Carbon monoxide poisoning</p> Signup and view all the answers

    What is the primary cause of oxygen deficiency in mines during and after fires?

    <p>Consumption of oxygen by combustion or chemical reaction</p> Signup and view all the answers

    What is a potential hazard when dealing with sulphide ore bodies during mine fires?

    <p>Presence of sulphur dioxide</p> Signup and view all the answers

    What is a potential indication of methane presence in a mine?

    <p>Presence of hydrogen sulphide</p> Signup and view all the answers

    What hazardous gas is released when PVC-covered belting is heated?

    <p>Chlorine gas</p> Signup and view all the answers

    What is a major hazard during rescue or recovery operations in mines?

    <p>Presence of methane</p> Signup and view all the answers

    What should you do when near power lines while raising or lowering ladders or elevated work platforms?

    <p>Maintain a safe distance and secure the ladder</p> Signup and view all the answers

    What should you avoid using to extinguish fires in energized electrical equipment?

    <p>Solid or straight water streams</p> Signup and view all the answers

    What can indicate the presence of downed wires in your surroundings?

    <p>A tingling sensation</p> Signup and view all the answers

    What is a critical skill for mine rescue teams to possess when operating in hazardous environments?

    <p>Identifying and responding to toxic substances</p> Signup and view all the answers

    What can create an oxygen-deficient atmosphere in a mine during emergencies?

    <p>Fires emitting toxic gases</p> Signup and view all the answers

    What is the primary objective for miners during a mine fire?

    <p>Protecting themselves from toxic gases and oxygen deficiency</p> Signup and view all the answers

    What is the primary purpose of Intrinsic Safety design?

    <p>To limit energy to a level below that required to ignite a specific hazardous atmospheric mixture</p> Signup and view all the answers

    What is the primary benefit of using direct-reading instruments in mine rescue gas detection?

    <p>To provide information at the time of sampling</p> Signup and view all the answers

    What category of hazardous atmospheres includes particulate contaminants?

    <p>Smoke, aerosols, fumes</p> Signup and view all the answers

    What is the most immediate hazard to life during and after fires in mines?

    <p>Carbon monoxide poisoning and oxygen deficiency</p> Signup and view all the answers

    What gas is always present at the time of a fire and gives little or no warning of its presence?

    <p>Carbon monoxide</p> Signup and view all the answers

    What is a critical consideration when selecting gas detection equipment?

    <p>The equipment's compatibility with the incident's specific needs</p> Signup and view all the answers

    What should be considered before performing any gas testing?

    <p>All personal protective equipment</p> Signup and view all the answers

    What is the primary cause of oxygen deficiency in mines during and after fires?

    <p>Both combustion and chemical reaction</p> Signup and view all the answers

    What type of gas is released when Polyvinylchloride (PVC)-covered belting is heated?

    <p>Chlorine</p> Signup and view all the answers

    What can indicate the presence of methane in a mine during rescue or recovery operations?

    <p>Hydrogen sulphide</p> Signup and view all the answers

    What should you do when approaching a vehicle or apparatus that is in contact with electrical wires?

    <p>Avoid touching the vehicle or apparatus</p> Signup and view all the answers

    What can be a hidden hazard in fences when working near power lines?

    <p>Energized wires outside of your field of view</p> Signup and view all the answers

    What is a critical aspect of mine rescue operations in environments with hazardous substances?

    <p>Being able to respond safely to toxic substances</p> Signup and view all the answers

    What can create a hazardous atmosphere in a mine during emergencies such as fires?

    <p>Large quantities of toxic or explosive gases</p> Signup and view all the answers

    What should you avoid using on fires in energized electrical equipment?

    <p>Solid or straight water streams</p> Signup and view all the answers

    What can prevent the dangerous accumulation of gases in mines, except in the case of fire?

    <p>Adequate ventilation</p> Signup and view all the answers

    At what level of oxygen displacement can non-toxic gaseous impurities become dangerous?

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

    What is a primary way that gases can affect people?

    <p>All of the above</p> Signup and view all the answers

    What can cause considerable discomfort in mines?

    <p>High temperatures with high humidity</p> Signup and view all the answers

    What can be a factor in the effects of gases on people in mines?

    <p>All of the above</p> Signup and view all the answers

    What is the explosive range of hydrogen sulphide?

    <p>4.3%–45%</p> Signup and view all the answers

    What may cause an oxygen deficient atmosphere and have an anaesthetizing effect in high concentrations?

    <p>MAPP</p> Signup and view all the answers

    How is hydrogen sulphide formed in blasting operations?

    <p>In dust explosions occurring in sulphide ore bodies</p> Signup and view all the answers

    What is a highly toxic gas that can immediately paralyze the sense of smell and progress to respiratory paralysis then death?

    <p>Hydrogen sulphide</p> Signup and view all the answers

    What is the explosive range of MAPP?

    <p>1.8%–11.7%</p> Signup and view all the answers

    What is the unit of measurement for airborne particulate concentrations?

    <p>Milligrams per cubic metre of air (mg/m3)</p> Signup and view all the answers

    What is the term for the minimum concentration of a gas or vapour in air that will ignite when exposed to an ignition source?

    <p>Lower Explosive Limit (LEL)</p> Signup and view all the answers

    What is the pH of pure water?

    <p>7</p> Signup and view all the answers

    What is the term for the ratio of the density of a substance to the density of a standard substance under specified conditions?

    <p>Relative density (vapour density)</p> Signup and view all the answers

    What is the term for a substance with a pH below 7?

    <p>Acidic</p> Signup and view all the answers

    What is the primary reference guide for rescuers responding to incidents involving hazardous materials?

    <p>The Emergency Response Guidebook for Incidents Involving Hazardous Materials</p> Signup and view all the answers

    What are the four categories of stress reactions that may occur in critical incidents?

    <p>Cognitive, physical, emotional, and behavioural</p> Signup and view all the answers

    What is the significance of the number of stress reactions experienced in a critical incident?

    <p>The more reactions, the greater the impact on the individual</p> Signup and view all the answers

    What is the significance of the duration of stress reactions in a critical incident?

    <p>The longer the reactions, the more potential for permanent harm</p> Signup and view all the answers

    What is a critical incident, as defined in the context of hazardous materials response?

    <p>An event that is outside the range of usual human experience</p> Signup and view all the answers

    Which resource is available to responders for 24-hour national emergency response advisory service?

    <p>CANUTEC (Canadian Transport Emergency Centre)</p> Signup and view all the answers

    What is the purpose of having site-specific response procedures in hazardous materials response?

    <p>To ensure responders are competent in site-specific response procedures</p> Signup and view all the answers

    What is the significance of having on-site expertise in hazardous materials response?

    <p>It is important to have on-site expertise in hazardous materials response</p> Signup and view all the answers

    What is the purpose of the Emergency Response Guidebook in hazardous materials response?

    <p>To provide guidance on responding to incidents involving hazardous materials</p> Signup and view all the answers

    What is the significance of the Material Safety Data Sheets (MSDS) in hazardous materials response?

    <p>They provide information on the safe handling and use of hazardous materials</p> Signup and view all the answers

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