POF 201-250

The regime of flight from the critical Mach number up to approximately M = 1.3 is called the:

• hypersonic range.

• supersonic range.

• transonic range.

• subsonic range.

Which of these statements about a trimmable horizontal stabilizer is correct?

• A trimmed aeroplane with an aft CG requires the stabiliser leading edge to be higher than in the case of a forward CG in the same condition.

• A trimmed aeroplane with an aft CG requires the stabilizer leading edge to be lower than in the case of a forward CG in the same condition.

• Because cake-off speeds do not vary with CG position, the need for stabilizer adjustment is dependent on flap position only.

• At the aft CG limit, stabilizer trim is adjusted fully nose up to obtain maximum elevator authority at rotation during take-off.

As the centre of gravity is changed, recovery from a stall becomes progressively:

• more difficult as the centre of gravity moves aft.

• more difficult as the centre of gravity moves forward.

• less difficult as the centre of gravity moves aft.

• is unaffected by centre of gravity position. only by weight.

The point, where the aerodynamic lift acts on a wing is:

• the CG location.

• the centre of pressure.

• the point of maximum thickness of the wing.

• the suction point of the wing.

An aeroplane flying at 200 kts in straight and level flight is subjected to a disturbance that suddenly decreases the speed by 40 kt. Assuming the angle of attack remains constant, the load factor will initially:

• decrease to 0.60.

• decrease to 0.64.

• decrease to 0.80.

• remain unchanged, since the angle of attack does not change.

Which of these statements about the gust load factor on an aeroplane are correct or incorrect? 1) When the mass increases, the gust load factor increases. 2) When the altitude increases, the gust load factor increases.

• 1) is correct, 2) is incorrect.

• 1) is incorrect, 2) is correct.

• 1) is incorrect, 2) is incorrect.

• 1) is correct, 2) is correct.

When the blades of a propeller are in the feathered position:

• the wind milling RPM is the maximum.

• the propeller produces an optimal windmilling RPM.

• the drag of the propeller is then minimal.

• the RPM is then just sufficient to lubricate the engine.

In order to fly a rate one turn at a higher airspeed, the bank angle must be:

• decreased and the turn radius will increase.

• increased and the turn radius will decrease.

• increased and the turn radius will increase.

• decreased and the turn radius will decrease.

Which statement is correct regarding the gyroscopic effect of a clockwise rotating propeller on a single engine aeroplane? 1) Pitch up produces left yaw. 2) Right yaw produces pitch up.

• 1) is correct, 2) is correct.

• 1) is incorrect, 2) is incorrect.

• 1) is correct, 2) is incorrect.

• 1) is incorrect, 2) is correct.

The application of the area rule on aeroplane design will decrease the:

• wave drag.

• skin friction drag.

• induced drag.

• form drag.