Mine Rescue Statements of Fact - Test No. 5 Questions taken from the 2016 Coal Mine Rescue Statements of Fact - Group A Progress Indicator: Question 7 of 20 7.  When checking the exhalation valve you set the RZ tester to ________. Choices: Negative pressure pumping Positive pressure pumping Leak test Dosage 0.5 – 2 L/min