Respirable Coal Mine Dust Certification Exam 3|
Taken from the 2014 MSHA Instruction Guide (IG) 100
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).
- battery voltage
- hose length
- permissibility features
- flow rate