The cockpit oxygen pressure gauge reads: A) The oxygen pressure which is present at the crew masks. B) Electrically, system low pressure. C) Bottle pressure. D) Electrically, system high pressure.
Passenger masks are automatically dropped when the: A) Oxygen selector is in NORMAL and cabin altitude exceeds 13,500 Feet. B) Cabin altitude exceeds 13,500 feet, regardless of oxygen selector position. C) Oxygen selector is in MANUAL DROP, regardless of altitude. D) A and C.
If DC power fails, placing the oxygen selector in: A) MANUAL DROP deploys the passenger masks, regardless of the cabin altitude. B) MANUAL DROP deploys the passenger masks only if 13,500 feet cabin altitude is exceeded. C) CREW ONLY does not restrict oxygen to the crew if cabin altitude is above 13,500. D) any of the three operating positions will not route oxygen to the passengers; they have their own dedicated oxygen supply system.
The purpose of the altitude pressure switch is to: A) Bypass oxygen flow directly to the passengers regardless of oxygen selector position. B) Open solenoid at 13,500 feet cabin altitude, allowing oxygen flow to the passenger oxygen distribution system. C) Close a solenoid valve at 13,500 feet cabin altitude, stopping oxygen flow to the passengers. D) Restore cabin altitude to 8,000 feet so that oxygen is not required.
If the oxygen selector is placed in CREW ONLY: A) The passenger masks will not drop automatically, cabin altitude above 13,500 feet. B) The passenger masks will deploy automatically, cabin altitude above 13,500 feet. C) The passenger masks will still receive oxygen if the cabin altitude is above 8,000 feet. D) Normal DC power is removed from the passenger mask door actuators, thus preventing them from opening automatically.
If normal DC power is lost with the oxygen selector in NORMAL: A) The passenger masks will deploy immediately, regardless of the cabin altitude. B) The passenger masks cannot be dropped manually. C) The oxygen pressure gauge on the copilot’s panel will be inoperative. D) Automatic dropping of the passenger masks will not occur.
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