PL080 - Principles of Flight PPL(A)

At what altitude, density of the air in ISA atmosphere is equal to the ISA density at sea level?

At what altitude, density of the air in ISA atmosphere is equal to half of the ISA density at sea level?

On what altitude pressure is equal to half of pressure at sea level in ISA atmosphere?

Air flow around the wing is deflected towards: 

 The maximum distance between the upper and lower surfaces of the aerofoil is: 

The highest speed at which you can fly in calm air is: 

Momentum relative to normal, which arises from the aileron deflection by the same angle in opposite directions is called: 

Dutch roll is one of the types of instability: 

Spiral instability is one of types of instability: 

Slightly increase of the angle of attack in range just below maximum angle of attack causes:

Wing icing causes:

Airframe rotation around OX axis is realized through:

Airframe rotation around OY axis is realized through: 

Airframe rotation around OZ axis is realized through: 

 Induced drag increases when: 

Induced drag increases when:

 Interference drag is caused by: 

Form drag depends only on the shape of the body: 

Aerofoil skin friction drag in cruise flight angles of attack is the smallest when the airflow is:

Skin friction drag of laminar airflow compared to turbulent air flow is: 

Drag which is due to vortices at wing tips caused by equalizing air pressure on the upper and lower surfaces is called:

All-moving tailplane is a horizontal stabilizer and elevator: 

What will happen after exceeding speed which is limited by wing torsional rigidity: 

After aileron deflection at high speed arise: 

 During spin entry, the wing, which has higher angle of attack:

The location of Centre of Pressure on asymmetrical aerofoil withincreasing angle of attack: 

The location of Centre of Pressure on reflex-cambered aerofoil withincreasing angle of attack:

Fowler flaps are used to: 

Wing area which generates lift is:

The reson of skid in turn can be:

The reson of slip in turn can be: 

Design manoeuvering speed "Va" is: 

Speed for rough air operations, VRA is:

Laminar aerofoil are those of which:

The straight line joining leading and trailing edge of the wing aerofoil is:

Dynamic stall differs from the static because during the dynamic stall: 

Static stall is characterized by:

Airflow around the wing tips due to equalizing pressure on the upper and lower surfaces creates vortices, which: 

Forward movement of Center of gravity: 

Aft movement of Center of gravity: