What percentage of the atmosphere is Nitrogen

• 21%

• 100%

• 78%

• 1%

What percentage of the atmosphere is Oxygen

• 78%

• 50%

• 95%

• 21%

What is the ISA sea level density

• 1225 kg/m³

• 1.225 kg/m²

• 1.225 kg/m³

• 0.1225 kg/m²

What happens to air pressure with a gain in altitude?

• Increases

• No change

• Decreases

• Gains more energy

Select all values that are ISA values at sea level

• 15°C

• 1013.25 hPa

• 1.225 kg/m³

• 1013.25 Inches of Mercury

What happens to density if temperature increases?

• Air density increases

• Air density decreases

• It will not change

With an increase in density altitude what would happen to engine performance?

• Engine performance would get better

• No change to engine performance

• Engine performance would decrease

At approximately 18,000 - 20,000' what will the pressure be compared to sea level

• The same as sea level pressure

• 75% of sea level pressure

• 25% of sea level pressure

• Half of sea level pressure

What is viscosity?

• The stickiness of air

• The smoothness of air

• The temperature of air

• The feeling of the air

If pressure increases what happens to density

• Decreases

• Nothing at altitudes below 10,000'

• Pressure doesn't effect density at all

• Increases