PL080 - Principles of Flight PPL(A)

 If the body displaced from an equilibrium by a short-term external force is moving with constant spedd, then that body exhibits:

If the body displaced from an equilibrium by a short-term external force is in constant accelerated motion, then that body exhibits: 

If we add separate drags of all parts of the airframe (eg. wings, fuselage, tail, etc.), then the obtained sum is: 

If you double the velocity, the lift force:

If you double the velocity, the drag force:

 If you reduce the temperature of the airflow, without changing the angle of attack, wing area and flow rate then: 

If we increase the surface of the horizontal stabilizer: 

The angle of attack for which Cd is minimum is always: 

Angle of attack of the airfoil profile which is concave-convex shaped, for which there is no induced drag created has the value: 

Angle of attack of profile is the angle between:

Angle between the chord line and the direction of undisturbed airflow is:

When altitude indicated on the ground by the pressure altimeter is a pressure altitude equal to the elevation of the airport?

Flaps are used to:

Compensation aerodynamic rudder is designed to:

 Aerodynamic compensation of rudder is also called aerodynamic balance of the rudder. 

Flat spin is:

Critical flutter speed is the speed for which:

Which axis is called normal axis?

Which axis of the coordinate system is called the longitudinal axis?

Which axis is called the lateral axis? 

Which devices are not lift augmentation wing devices? 

What is a potential energy?

The curve representing the shape of wings as seen from above is:

The line connecting the most front points of aerofoil is: 

The line connecting the most rear points of aerofoil is: 

The line drawn equidistant between the upper and lower surfaces of an aerofoil is called:

Flight takes place on the angle of attack, for which the coefficient of drag "Cx" is the minimum. As a result of a small increase in angle of attack:

"Frise" ailerons-type are used to:

"Frise" ailerons-type are used to: 

The never exceed speed "VNE"is:

Maximum effeciency of profile:

The maximum speed of flight in turbulent air is:

The maximum speed at which you can still use the full controls deflection without exceeding the maximum airframe load is determined as: 

Lift augmentation is used to:

The minimum value of Cx coefficient we can obtain for the angle of attack equal 0°. 

Aerodynamic momentum measured from the aerodynamic center in flight speed range:

Aileron adverse yaw is because: 

On the lower surface of the wing air flow is deflected towards wing tip: 

On the upper surface of the wing air flow is deflected towards wing root: 

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