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

Question 1

Following a single-wing stall and pitch-down moment, how can a spin be prevented?

Accepted Answer

Rudder opposite lower wing, releasing elevator to build up speed

Answer

Deflect all rudders opposite to lower wing

Answer

Pushing the elevator to build up speed to re-attach airflow on wings

Answer

Pulling the elevator to bring the plane back to normal attitude

Question 2

The drag coefficient...

Accepted Answer

Cannot be lower than a non-negative, minimal value.

Answer

Is proportional to the lift coefficient

Answer

Increases with increasing airspeed.

Answer

May range from zero to an infinite positive value

Question 3

Number 3 in the drawing corresponds to the... See figure (PFA-010) Siehe Anlage 1

Accepted Answer

Camber line.

Answer

Thickness.

Answer

Chord.

Answer

Chord line.

Question 4

Pressure drag, interference drag and friction drag belong to the group of the...

Accepted Answer

Parasite drag

Answer

Main resistance.

Answer

Induced drag.

Answer

Total drag.

Question 5

Which statement about the airflow around an aerofoil is correct if the angle of attack decreases?

Accepted Answer

The center of pressure moves aft

Answer

The center of pressure moves forward

Answer

The stagnation point moves down

Answer

The stagnation point remains constant

Question 6

In straight and level flight with constant performance of the engine, the angle of attack at the wing is...

Accepted Answer

Smaller than in a climb.

Answer

Smaller than in a descent.

Answer

Greater than in a climb.

Answer

Greater than at take-off.

Question 7

Which point on the aerofoil is represented by number 3? See figure (PFA-009) Siehe Anlage 2

Accepted Answer

Transition point

Answer

Stagnation point

Answer

Separation point

Answer

Center of pressure

Question 8

What is the function of the horizontal tail (among other things)?

Accepted Answer

To stabilise the aeroplane around the lateral axis

Answer

To stabilise the aeroplane around the longitudinal axis

Answer

To initiate a curve around the vertical axis

Answer

To stabilise the aeroplane around the vertical axis

Question 9

Which constructive feature has the purpose to reduce stearing forces?

Accepted Answer

Aerodynamic rudder balance

Answer

T-tail

Answer

Differential aileron deflection

Answer

Vortex generators

Question 10

Which of the following options is likely to produce large induced drag?

Accepted Answer

Small aspect ratio

Answer

Large aspect ratio

Answer

Low lift coefficients

Answer

Tapered wings

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

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