POF 1-50

Regarding a positively cambered aerofoil section, which statement is correct? 1) The angle of attack has a negative value when the lift coefficient equals zero. 2) A nose up pitching moment exists when the lift coefficient equals zero.

• 1) incorrect, 2) incorrect.

• 1) correct, 2) correct.

• 1) incorrect, 2) correct.

• 1) correct, 2) incorrect.

When a turn is initiated, adverse yaw is:

• the tendency of an aeroplane to yaw in the same direction of turn due to the different wing speeds.

• a momentary yawing motion opposite to the turn due to an incorrect differential aileron movement.

• the tendency of an aeroplane to yaw in the opposite direction of turn mainly due to the difference in induced drag on each wing.

• the tendency of an aeroplane to yaw in the opposite direction of turn mainly due to the difference in aileron form drag.

In which phase of the take-off is the aerodynamic effect of ice located on the wing leading edge most critical?

• The take-off run.

• The last part of the rotation.

• All phases are equally important.

• During climb with all engines operating.

The twisting of a propeller blade from root to tip has been made to:

• ensure its optimum thrust is always achieved at take-off.

• prevent excessive stress at the blade tip at high RPM.

• provide a constant angle of attack from root to tip.

• provide its greatest thrust toward the blade root.

In straight and level flight at a speed of 1.3Vs, the lift coefficient, expressed as a percentage of its maximum (CLMAX), would be:

• 169%

• 130%

• 59%

• 77%

If the propeller pitch of a windmilling propeller is decreased during a glide at constant IAS the propeller drag in the direction of flight will:

• decrease and the rate of descent will decrease.

• increase and the rate of descent will decrease.

• increase and the rate of descent will increase.

• decrease and the rate of descent will increase.

Low speed pitch-up can be caused by a significant thrust:

• decrease with engines located on the rear fuselage.

• increase with podded engines located beneath a low-mounted wing.

• decrease with podded engines located beneath a low-mounted wing.

• increase with engines located on the rear fuselage.

Which statement about propeller noise is correct? 1) Propeller noise increases when the blade tip speed increases. 2) For a given engine and propeller blade shape, a decrease in the number of propeller blades allows for a reduction in propeller noise.

• 1) is incorrect, 2) is correct.

• 1) is correct, 2) is correct.

• 1) is correct, 2) is incorrect.

• 1) is incorrect, 2) is incorrect.

Considering subsonic incompressible airflow through a Venturi, which statement is correct? 1) The dynamic pressure in the throat is the same as in the undisturbed airflow. 2) The total pressure in the throat is higher than in the undisturbed airflow.

• 1) is incorrect, 2) is correct.

• 1) is correct, 2) is incorrect.

• 1) is correct, 2) is correct.

• 1) is incorrect, 2) is incorrect.

During the retraction of the flaps at a constant angle of attack the aeroplane starts to:

• bank.

• sink suddenly.

• climb.

• yaw.