Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

Question 1

Which statement about induced drag during the horizontal cruise flight is correct?

Accepted Answer

Induced drag decreases with increasing airspeed

Answer

Induced drag has a minimum at a certain speed and increases at higher as well as lower speeds

Answer

Induced drag has a maximum at a certain speed and decreases at higher as well as lower speeds

Answer

Induced drag increases with increasing airspeed

Question 2

In case of a stall it is important to...

Accepted Answer

Decrease the angle of attack and increase the speed

Answer

Increase the angle of attack and increase the speed

Answer

Increase the angle of attack and reduce the speed

Answer

Increase the bank angle and reduce the speed

Question 3

Bernoulli's equation for frictionless, incompressible gases states that...

Accepted Answer

Total pressure = dynamic pressure + static pressure

Answer

Total pressure = dynamic pressure - static pressure

Answer

Static pressure = total pressure + dynamic pressure

Answer

Dynamic pressure = total pressure + static pressure

Question 4

Rotation around the lateral axis is called...

Accepted Answer

Pitching

Answer

Yawing

Answer

Rolling

Answer

Stalling

Question 5

What has to be considered when operating a sailplane with water ballast?

Accepted Answer

It should stay below freezing level

Answer

Best glide angle decreases

Answer

Significant CG shifts

Answer

Best glide speed decreases

Question 6

The laminar boundary layer on the aerofoil is located between...

Accepted Answer

The stagnation point and the transition point

Answer

The stagnation point and the centre of pressure

Answer

The transition point and the separation point

Answer

The transition point and the centre of pressure

Question 7

During a stall, the lift...

Accepted Answer

Decreases and drag increases

Answer

Increases and drag increases

Answer

Decreases and drag decreases

Answer

Increases and drag decreases

Question 8

Which statement describes a situation of static stability?

Accepted Answer

An aircraft distorted by external impact will return to the original position

Answer

An aircraft distorted by external impact will tend to an even more deflected position

Answer

An aircraft distorted by external impact will maintain the deflected position

Answer

An aircraft distorted by external impact can return to its original position by rudder input

Question 9

At stationary glide and the same mass, what is the difference when using a thick airfoil instead of a thinner airfoil?

Accepted Answer

More drag, same lift

Answer

Less drag, less lift

Answer

More drag, less lift

Answer

Less drag, same lift

Question 10

The angle (alpha) shown in the figure is referred to as... See figure (PFA-003) DoF: direction of airflow

Accepted Answer

Angle of attack

Answer

Lift angle

Answer

Angle of incidence

Answer

Angle of inclination

Exam questions Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

SPL - Sailplane Pilot License: Principles of Flight (Aeroplane) 10 Questions no time limit