Coal Mine Rescue Test III
In order to get 100%, you must answer all of the following correctly.
1.  Your captain may order the team to return __________ to the fresh-air base if a team member's apparatus malfunctions.




2.  In __________ explosive atmospheres, nonsparking tools, nails, and spads should be used.




3.  When you have located a barricade, you should try to __________ whether the miners inside are still alive and conscious.




4.  Carbon monoxide is a product of __________ combustion of any carbon material.




5.  Opening of seals __________ can cause a re-ignition of a fire or an explosion.




6.  Specific gravity is the __________ of a gas compared to an equal volume of normal air under the same temperature and pressure.




7.  The explosive range of __________ in air is 5 to 15 volume percent.




8.  The lower explosive limit of hydrogen is __________.




9.  Acetylene is __________ when methane is burned or heated in air having a low oxygen content.




10.  _________ exposure to hydrogen sulfide may dull the sense of smell.




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