Air Tech - PPL POF and Atmosphere

Moist air is ___ dense than dry air

• less

• more

Choose the correct ISA values:

• 15 degrees at SFC, 1013hPA at MSL

• 13 degrees at MSL, 1013.25hPa at MSL

• 15 degrees at MSL, 1013.25hPa at SFC

• 15 degrees at MSL, 1013hPa at MSL

Which will give the best performance?

• high pressure, high temperature, high humidity

• high temperature, low humidity

• low pressure, low temperature, low humidity

• high pressure, low humidity

A high lift aerofoil will be ___ than a high speed aerofoil

• thinner with more camber

• thicker with more camber

• thinner with less camber

• thicker with less camber

Which is being described below:

the edge facing the airflow

• camber

• leading edge

• trailing edge

• airflow point

What is the chord line?

• a line joining the upper and lower surfaces of the aerofoil

• a line joining the left and right wing

• a line representing airflow that is unaffected by the aircraft

• a line joining the leading and trailing edges of the wing

Thickness refers to:

• the depth of the aerofoil

• the length of the aerofoil

• the width of the aerofoil

• the depth of the fuselage

Where is the angle of attack taken from?

• between the mean camber line and RAF

• between the RAF and chord line

• between the chord line and mean camber line

• between the top and bottom surfaces of the aerofoil

fill in the blanks:

"in a _______ of an _______ fluid the sum of __________ must remain __________"

• flow, optimal, all pressures, one

• streamline, ideal, all gases, constant

• streamline flow, air, all pressures, one

• streamline flow, ideal, all energies, constant

What is the principle factor for why lift is produced?

• the increase in static pressure above the aerofoil

• the increase in dynamic pressure at the trailing edge of the aerofoil

• the reduction in static pressure above the aerofoil

• the reduction in static pressure below the aerofoil