PA Mining Law - Sections 251-260 (1) Practice test questions for the PA Mine Officials' Exam
Progress Indicator:
 
Question 2 of 16
2. The quantity of return air was 14,500 CFM and found to contain 3.4% CH4. What is the total volume needed to reduce the methane content to 2.0%?
View solution
Choices:
- 52,560 CFM
- 42,650 CFM
- 38,560 CFM
- 24,650 CFM
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