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Respirable Coal Mine Dust Certification Exam 3
Taken from the 2014 MSHA Instruction Guide (IG) 100


Progress Indicator:
Question 1 of 20

1.  Despite the constant-flow feature on approved gravimetric respirable coal mine dust sampling pumps, the _________ of those pumps must still be checked during the second and last hour of sampling by a certified person (sampling).

Choices:
  1. battery voltage
  2. hose length
  3. permissibility features
  4. flow rate