Technician Team Exam - Drager BG4
From the 2013 North Central Regional Mine Rescue Contest, Wilmington, IL

Progress Indicator:
Question 1 of 20

1.  Drager BG4s meet MSHA explosion-proofing standards for:

Choices:
  1. Hydrogen atmospheres
  2. Gaseous mines
  3. Explosive dust atmospheres
  4. All of the above
  5. None of the above

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