58 Questions
What is the primary goal of Intrinsic Safety design?
To limit energy to prevent ignition of hazardous atmospheric mixtures
What category of hazardous atmospheres includes oxygen deficiency and asphyxiating gases?
Oxygen deficiency/Asphyxiating gases
What type of instruments are used in mine rescue gas detection?
Direct-reading instruments
What is the importance of selecting gas detection equipment?
To fit the specific needs of the incident
What should be considered before any gas testing?
All personal protective equipment
What is the primary benefit of direct-reading instruments in mine rescue gas detection?
They enable rapid decision-making
What is the most immediate hazard to life during and after fires in mines?
Carbon monoxide poisoning
What is the primary cause of oxygen deficiency in mines during and after fires?
Consumption of oxygen by combustion or chemical reaction
What is a potential hazard when dealing with sulphide ore bodies during mine fires?
Presence of sulphur dioxide
What is a potential indication of methane presence in a mine?
Presence of hydrogen sulphide
What hazardous gas is released when PVC-covered belting is heated?
Chlorine gas
What is a major hazard during rescue or recovery operations in mines?
Presence of methane
What should you do when near power lines while raising or lowering ladders or elevated work platforms?
Maintain a safe distance and secure the ladder
What should you avoid using to extinguish fires in energized electrical equipment?
Solid or straight water streams
What can indicate the presence of downed wires in your surroundings?
A tingling sensation
What is a critical skill for mine rescue teams to possess when operating in hazardous environments?
Identifying and responding to toxic substances
What can create an oxygen-deficient atmosphere in a mine during emergencies?
Fires emitting toxic gases
What is the primary objective for miners during a mine fire?
Protecting themselves from toxic gases and oxygen deficiency
What is the primary purpose of Intrinsic Safety design?
To limit energy to a level below that required to ignite a specific hazardous atmospheric mixture
What is the primary benefit of using direct-reading instruments in mine rescue gas detection?
To provide information at the time of sampling
What category of hazardous atmospheres includes particulate contaminants?
Smoke, aerosols, fumes
What is the most immediate hazard to life during and after fires in mines?
Carbon monoxide poisoning and oxygen deficiency
What gas is always present at the time of a fire and gives little or no warning of its presence?
Carbon monoxide
What is a critical consideration when selecting gas detection equipment?
The equipment's compatibility with the incident's specific needs
What should be considered before performing any gas testing?
All personal protective equipment
What is the primary cause of oxygen deficiency in mines during and after fires?
Both combustion and chemical reaction
What type of gas is released when Polyvinylchloride (PVC)-covered belting is heated?
Chlorine
What can indicate the presence of methane in a mine during rescue or recovery operations?
Hydrogen sulphide
What should you do when approaching a vehicle or apparatus that is in contact with electrical wires?
Avoid touching the vehicle or apparatus
What can be a hidden hazard in fences when working near power lines?
Energized wires outside of your field of view
What is a critical aspect of mine rescue operations in environments with hazardous substances?
Being able to respond safely to toxic substances
What can create a hazardous atmosphere in a mine during emergencies such as fires?
Large quantities of toxic or explosive gases
What should you avoid using on fires in energized electrical equipment?
Solid or straight water streams
What can prevent the dangerous accumulation of gases in mines, except in the case of fire?
Adequate ventilation
At what level of oxygen displacement can non-toxic gaseous impurities become dangerous?
Below 19.5%
What is a primary way that gases can affect people?
All of the above
What can cause considerable discomfort in mines?
High temperatures with high humidity
What can be a factor in the effects of gases on people in mines?
All of the above
What is the explosive range of hydrogen sulphide?
4.3%–45%
What may cause an oxygen deficient atmosphere and have an anaesthetizing effect in high concentrations?
MAPP
How is hydrogen sulphide formed in blasting operations?
In dust explosions occurring in sulphide ore bodies
What is a highly toxic gas that can immediately paralyze the sense of smell and progress to respiratory paralysis then death?
Hydrogen sulphide
What is the explosive range of MAPP?
1.8%–11.7%
What is the unit of measurement for airborne particulate concentrations?
Milligrams per cubic metre of air (mg/m3)
What is the term for the minimum concentration of a gas or vapour in air that will ignite when exposed to an ignition source?
Lower Explosive Limit (LEL)
What is the pH of pure water?
7
What is the term for the ratio of the density of a substance to the density of a standard substance under specified conditions?
Relative density (vapour density)
What is the term for a substance with a pH below 7?
Acidic
What is the primary reference guide for rescuers responding to incidents involving hazardous materials?
The Emergency Response Guidebook for Incidents Involving Hazardous Materials
What are the four categories of stress reactions that may occur in critical incidents?
Cognitive, physical, emotional, and behavioural
What is the significance of the number of stress reactions experienced in a critical incident?
The more reactions, the greater the impact on the individual
What is the significance of the duration of stress reactions in a critical incident?
The longer the reactions, the more potential for permanent harm
What is a critical incident, as defined in the context of hazardous materials response?
An event that is outside the range of usual human experience
Which resource is available to responders for 24-hour national emergency response advisory service?
CANUTEC (Canadian Transport Emergency Centre)
What is the purpose of having site-specific response procedures in hazardous materials response?
To ensure responders are competent in site-specific response procedures
What is the significance of having on-site expertise in hazardous materials response?
It is important to have on-site expertise in hazardous materials response
What is the purpose of the Emergency Response Guidebook in hazardous materials response?
To provide guidance on responding to incidents involving hazardous materials
What is the significance of the Material Safety Data Sheets (MSDS) in hazardous materials response?
They provide information on the safe handling and use of hazardous materials
Learn about the two greatest hazards to life during and following fires, including carbon monoxide poisoning and oxygen deficiency. Identify the conditions that cause contamination of mine atmospheres and the seriousness of these hazards.
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