Pof 151-200

If angle of attack is increased beyond the critical angle of attack, the lift coefficient _ and the stagnation point moves _ .

• decreases; rearward

• increases; rearward

• decreases; forward

• increases; forward

Assuming standard atmospheric conditions, in order to generate the same amount of lift as altitude is increased, an aeroplane must be flown at:

• a higher TAS for any given angle of attack.

• the same TAS regardless of angle of attack.

• a lower TAS and a lower angle of attack.

• a lower TAS for any given angle of attack.

The lift coefficient CL versus angle of attack curve of a negatively cambered aerofoil section intersects the vertical axis of the graph:

• below the origin.

• above the origin.

• nowhere.

• at the origin.

For a given elevator deflection, aeroplane longitudinal manoeuvrability decreases when:

• the CG moves aft.

• flaps are retracted at constant IAS.

• the CG moves forward.

• IAS increases.

Which of these statements about an oblique shock wave are correct or incorrect? 1) The Mach number behind an oblique shock wave is lower than in front of it. 2) The total pressure behind an oblique shock wave is lower than in front of it.

• 1) is incorrect, 2) is incorrect

• 1) is correct, 2) is correct.

• 1) is incorrect, 2) is correct.

• 1) is correct, 2) is incorrect.

Given: Aeroplane mass: 50 000 kg; Lift/Drag ratio: 12; Thrust per engine: 20 000 N; Assumed g: 10 m/s²; For a straight, steady, wings level climb of a four-engine aeroplane. the all engines climb gradient will be:

• 4.3%

• 7.7%

• 60%

• 8.5%

Stall speed (IAS) varies with:

• altitude (below approximately 10 000 ft)

• weight.

• density.

• temperature.

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

• 1) is correct, 2) is correct.

• 1) is correct, 2) is incorrect.

• 1) is incorrect, 2) is correct.

• 1) is incorrect, 2) is incorrect

Two identical aeroplanes A and B, with the same mass, are flying steady level coordinated 20° bank turns. If the TAS of A is 130 kts and the TAS of B is 200 kts:

• the turn radius of A is greater than that of B.

• the load factor of A is greater than that of B.

• the rate of turn of A is greater than that of B.

• the lift coefficient of A is less than that of B.

Which direction from the primary control surface does an elevator adjustable trim tab move when the control surface is moved?

• Same direction.

• Opposite direction.

• In the same direction at high speeds to increase the stick force, but in the opposite direction at low speed.

• Remains fixed for all positions.