1. The monitron switches on when cylinder pressure exceeds _______ .

2. When charging the oxygen cylinder, the oxygen must be aviator grade or better, and must be between 99.0 and 99.7 % purity.

3. On BG-4 units which are in constant use, the valve disc on the exhalation and inhalation valve must be replaced ____________ .

4. To check the drainage valve on the BG-4, the RZ-25 tester should be pumped until the pressure gauge indicates _____________ .

5. To check the residual pressure warning, close the cylinder valve and observe the display unit.  The warning must react at approximately ____________ .

6. To check the relief valve on the BG-4, the RZ-25 tester needs to be set on ________________ .

7. On BG-4 units that are in constant use, the high pressure O-rings on the pressure reducer must be replaced ___________ .

8. The period of service and retreat must be planned independently of the low pressure warnings.  The mission must always be ended when the low pressure warning is at approximately 135 psi.

9. A damaged bypass system can cause a high dosage problem.

10. When performing the close cylinder/open cylinder (CCR/OCR) test, the oxygen cylinder must not have a pressure greater than ___________, otherwise the monitron will not open.