Mine Rescue Challenge Test No. 3
In order to get 100%, you must answer all of the following correctly.
21. Another source of nitrogen in underground mines is the detonation of explosives.



22. In a multi-level mine, a tunnel driven perpendicular to the main vein system of the mine is considered a ________?





23. The purpose of a permanent stopping is to separate two different atmospheres while still permitting miners to enter and exit without mixing the atmospheres.



24. Very violent explosions are possible when air contains more than 7 to 8 percent hydrogen.



25. The degree to which a toxic gas will affect you depends on three factors:
  1. how concentrated the gas is
  2. how explosive the gas is
  3. how long you’re exposed to the gas



26. Gas detectors must measure concentrations of carbon monoxide from 0.0 parts per million to at least 999 parts per million.



27. Knowing the effects of air current, temperature, and pressure on a gas will help you determine its _________.





28. Any flammable gas can explode under certain conditions.  In order for a flammable gas to explode, there must be enough of the gas in the air, enough oxygen, and a source of __________.





29. TLV, or threshold limit value is used to denote the _________ concentrations of gases to which workers can (under Federal regulations) be exposed over an 8-hour daily period.





30. The sorting of victims is commonly referred to as a "triage" system.  A fractured arm, hand, or foot takes priority over a miner suffering from moderate heat exhaustion.



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