PA Mining Law - Sections 251-260 (1)
Practice test questions for the PA Mine Officials' Exam


Progress Indicator:
Question 2 of 16

2.  If the return air current of a mine consists of 50,000 cubic feet of air per minute and also contains 0.8% methane, how much air must be added to reduce the methane content to 0.5%?

Choices:
  1. 30,000 cubic feet
  2. 60,000 feet
  3. 90,000 cubic feet
  4. none of the above


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