1) Critical Mach-number is the: Report

highest speed without supersonic flow over any part of the aeroplane.

speed at which there is subsonic airflow over all parts of the aircraaeroplane Mach number < 1).

2) The polar curve of an aerofoil is a graphic relation between: Report

Angle of attack and CL

CD and angle of attack

CL and CD

3) One disadvantage of the swept back wing is it's stalling characteristics. At the stall : Report

leading edge stall will occur first, which produces a nose-down moment

tip stall will occur first, which produces a pitch-up moment.

wing root stall will occur first, which produces a rolling moment

4) For an aeroplane with one fixed value of VA the following applies. VA is : Report

the speed at which the aeroplane stalls at the manoeuvring limit load factor at MTOW.

the maximum speed in smooth air

the speed at which unrestricted application of elevator control can be used, without exceeding the maximum manoeuvring limit load factor

5) What factors determine the distance travelled over the ground of an aeroplane in a glide ? Report

The wind and the lift/drag ratio, which changes with angle of attack

The wind and the aeroplane's mass

The wind and CLmax

EASA Questions Principles Of Flight Subsonic Aerodynamics