POF 1

Density:

• reduces as altitude increases

• is unaffected by temperature change

• increases with altitude increase

• reduces with temperature reduction

The presence of water vapor:

• in air will increase its density

• in the atmosphere will increase the power output of a piston engine

• in the atmosphere will increase the amount of lift generated by an aircraft for a given true airspeed

• in air will reduce its density

Atmospheric pressure:

• acts only vertically downwards

• is measured in Pascals per square inch

• acts in all directions

• increases with altitude

The air pressure that acts on anything immersed in it:

• is also known as Dynamic Pressure

• is also known as Static Pressure

• is greater at altitude than at sea level

• is also known as Total Pressure

What properties of the Earth's atmosphere most influence the performance of aircraft?

• its carbon dioxide content, temperature, pressure and humidity

• Its oxygen content, pressure, and water vapor content

• Its water vapor content, temperature, pressure and density

• Its nitrogen content, oxygen content, temperature and pressure

A piston engine aircraft flies in that layer of the atmosphere called:

• The Stratosphere

• The Troposphere

• The Mesosphere

• The Tropopause

The respective percentages of the four most abundant gases that make up the atmosphere are?

• Nitrogen 78% Oxygen 21% Argon 0.95% Carbon Dioxide 0.05%

• Oxygen 78% Nitrogen 21% Argon 0.95% Carbon Dioxide 0.05%

• Nitrogen 78% Oxygen 21% Argon 0.95% Carbon Monoxide 0.05%

• Oxygen 78% Nitrogen 21% Argon 0.95% Carbon Monoxide 0.05%

When considering the changes in density of the air with altitude, which of the following four options is correct?

• The temperature increase with increasing altitude causes density to increase

• The reduction in pressure with increasing altitude causes density to reduce

• The temperature reduction with increasing altitude causes density to increase

• The increase in pressure with increasing altitude causes density to reduce

Assuming that the pressure at sea level is ISA, but the temperature is 10°C higher than ISA, the density will be:

• as per ISA

• greater than ISA

• less than ISA

• unaffected

Which of the following options contains the main constituent gases of the Earth's atmosphere?

• Hydrogen, Carbon Dioxide and Helium

• Nitrogen, Oxygen and Water Vapor

• Nitrogen, Argon and Carbon Dioxide

• Helium, Nitrogen and Carbon Monoxide