Section 300: Electrical Test No. 3 Practice test questions for the PA Mine Officials' Exam
Progress Indicator:

Question 1 of 15
1. If methane gas is found at _______ or greater, the individual in charge shall immediately stop the machine, cut off the current at the nearest switch and report the matter to a mine official.
Choices:
- 1.0%
- 1.5%
- 2.0%
- none of the above
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