What is the primary composition of the Earth's atmosphere, and what percentage of it is oxygen?

• 78% oxygen and 21% nitrogen
• 21% oxygen and 78% nitrogen
• 1% oxygen and 99% nitrogen
• 99% oxygen and 1% nitrogen

What is the term used to describe a noticeable slowdown in thought processes and a decrease in consciousness due to a decrease in oxygen supply?

• Hypertension
• Hyperactivity
• Hypoglycemia
• Hypoxia

What is the primary physical state of Aviator's Breathing Oxygen (ABO)?

• Cryogenic liquid
• Gaseous
• Solid
• Liquid

How is water presence in gaseous oxygen tanks tested, and why is this test important?

• By tasting; to ensure purity
• By measuring pressure; to prevent explosions
• By checking for color changes; to enhance visibility
• By checking for freezing potential; to avoid blockages

In which situations are Chemical Oxygen Generators typically activated?

• During routine maintenance
• During high-altitude flights
• In emergency situations
• In normal operating conditions

What is the primary physical state of Liquid Oxygen (LOX)?

• Gaseous
• Solid
• Cryogenic liquid
• Liquid

What type of oxygen system is characterized by a continuous flow of oxygen regardless of breathing patterns?

• Continuous Flow
• Demand Flow
• Diluter Demand
• Variable Flow

What is the primary advantage of the Demand Flow oxygen system over the Continuous Flow system?

• Greater oxygen wastage
• Continuous flow during exhalation
• Oxygen conservation during inhalation
• Complexity of masks and regulators

What determines the design of various oxygen systems used in aircraft?

• Type of oxygen container
• Operational requirements
• Aircraft color
• Crew preferences

What is the primary function of the central regulator in larger transport category aircraft?

• To control cabin pressurization
• To distribute oxygen flow to passengers
• To manage engine bleed air
• To regulate fuel supply