Coal First Aid Contest Exam
Taken from the 2013 National Coal First Aid Contest Rules


Progress Indicator:
Question 2 of 25

2.  Re: Industrial Scientific MX6
Which of the following situations may cause readings of combustible gas to be lower than the actual gas concentration?

Choices:
  1. Silicone compound vapors
  2. Obstruction of the sensor openings
  3. None of the above
  4. Both a and b


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