Respirable Coal Mine Dust Certification Exam 1
Taken from the 2014 MSHA Instruction Guide (IG) 100

Progress Indicator:
Question 1 of 20

1.  Turning the CMDPSU sampling head assembly upside down _________.

  1. has no effect on the sample
  2. makes the pump run harder
  3. is a common cause of voided samples
  4. is the recommended means of collecting samples

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