7. The canister life is considered 'to be hours, regardless of depth. 



a. 3 



b. 4 



c. 5 



d. 6 



8. The red alarm light would be actuated by low battery voltage if the 

 voltage drops below volts. 



a. 22 



b. 22.5 



c. 23 



d. 23.5 



TRUE OR FALSE 



9. In the event of automatic oxygen supply system failure, the diver may 

 swim the MK-X in the manual mode at any depth. 



10. If the chest display switch is in the off position, the diver will 

 receive no reading as to the amount of oxygen in his breathing. 



11. On the MK-X, both the diluent and oxygen system loops have manual by- 

 pass valves. 



12. In the MK-X diving apparatus, the volume of breathing bags is 

 approximately 6 liters. 



13. When operating the MK-X unit in a manual mode, the automatic control 

 must be in the off position. 



14. During normal swims, the MK-X unit will maintain the oxygen content in 

 the breathing media at 0.4 atmospheres. 



15. While using the MK-X unit, the baralyme cartridge need not be changed 

 if the first swim was of a short duration according to mission rules. 



16. While swimming the MK-X unit, if the red light goes on and stays on, 

 then the swimmer should go to a manual mode of operating. 



17. As long as the oxygen content in the breathing media stays in range or 

 above range, the red warning light will not go on in the wrist display. 



18. The battery may be stored indefinitely connected to the charger without 

 damage . 



19. The risk of the diver getting the bends is greatly reduced by using 

 closed circuit SCUBA instead of the open circuit type at deeper depths. 



IV-12 



