Domanda 610, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

The power lever on on, and, the 'o2' lever on normal allows the oxygen to enter the regulator And enables breathing of a mixture of air/oxygen according to altitude.
With the EMERGENCY lever on OFF, in an emergency situation, one cannot use the oxygen mask to breathe.
The 'O2' lever on ON enables breathing of the over-pressure oxygen at a constant flow rate.
The Emergency Lever On On Enables Breathing Of Pure Oxygen At Ambient Pressure.