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Aerodynamics Flashcards

1
Q

8359

What procedure is recommended for an engines-out approach and landing?

A

The flightpath and procedures should be almost identical to a normal approach and landing.

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2
Q

8377
What will be the ratio between airspeed and lift if the angle of attack and other factors remain constant and airspeed is double? Lift will be

A

Four times greater.

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3
Q

8390

At what Mach range does the subsonic flight range normally occur?

A

Below .75 Mach

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4
Q

8326

Which of the following is considered a primary flight control?

A

Elevator.

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5
Q

8345
What effect does an increase in airspeed have on a coordinated turn while maintaining a constant angle of bank and altitude?

A

The rate of turn will decrease resulting in no change in load factor.

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6
Q

8394.2
A turbojet airplane has an increase in specific range with altitude, which can be attributed to three factors. One of those factors is

A

An increase in proportion of velocity versus thrust required.

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7
Q

8341

Which is a purpose of wing-mounted vortex generators?

A

Delays the onset of drag divergence at high speeds and aids in maintaining aileron effectiveness at high speeds.

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8
Q

8332

What is a purpose of flight spoilers?

A

Reduce lift without decreasing airspeed.

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9
Q

8378

What true airspeed and angle of attack should be used to generate the same amount of lift as altitude is increased?

A

A higher true airspeed for any given angle of attack.

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10
Q

8345.2

A bank angle of 15 degree will increase induced drag by about

A

7%

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11
Q

8328

What is the purpose of a control tab?

A

Move the flight controls in the event of manual reversion.

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12
Q

8365
Identify the type stability if the aircraft attitude remains in the new position after the controls have been neutralized,

A

Neutral longitudinal static stability.

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13
Q

8384

The primary purpose of high-lift devices is to increase the

A

Lift and reduce airspeed.

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14
Q

8373
Identify the type stability if the aircraft attitude tends to return to its original position after the controls have been neutralized.

A

Positive static stability.

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15
Q

8368

What is the reason for variations in geometric pitch along a propeller or rotor blade?

A

It permits a relatively constant angle of attack along its length when in cruising flight.

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16
Q

8346
What is the effect on total drag of an aircraft if the airspeed decreases in level flight below that speed for maximum L/D?

A

Drag increases because of increased induced drag.

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17
Q

9793.1

Aerodynamic braking is only effective up to approximately

A

60 to 70% of touchdown speed.

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18
Q

8340

What is the purpose of an elevator trim tab?

A

Modify the downward tail load for various airspeeds in flight eliminating flight-control pressures.

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19
Q

8324

When are inboard ailerons normally used?

A

Low-speed and high-speed flight.

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20
Q

8351

How can the pilot increases the rate of turn and decrease the radius at the same time?

A

Steepen the bank and decrease airspeed.

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21
Q

8333

For which purpose may flight spoilers be used?

A

Reduce the wings’lift upon landing.

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22
Q

8339
Which direction from the primary control surface does an elevator adjustable trim tab move when the control surface is moved?

A

Remains fixed for all positions.

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23
Q

8391

What is the principal advantage of a sweepback design wing over a straight wing design?

A

The critical Mach number will increase significantly.

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24
Q

9793.2

Ground spoilers used after landing are

A

More effective at high speed.

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25
Q

8330

What is the purpose of a servo tab?

A

Reduce control forces by deflecting in the proper direction to move a primary flight control.

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26
Q

8348

What affects indicated stall speed?

A

Weight, load factor, and power.

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27
Q

9740

During a skidding turn to the right, what is the relationship between the component of lift and centrifugal force?

A

Centrifugal force is greater than the horizontal lift component.

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28
Q

8331

Which is a purpose of leading-edge flaps?

A

Increase the camber of the wing.

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29
Q

9771

When compared to plain flaps, flaps

A

Produce only slightly more lift, but much more drag.

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30
Q

8397

What is the relationship between induced and parasite drag when the gross weight is increased?

A

Induced drag increases more than parasite drag.

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31
Q

8387

Within what Mach range does transonic flight regimes usually occur?

A

.75 to 1.20 Mach

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32
Q

8362

What effect, if any, does altitude have on V(MC) for an airplane with unsupercharged engines?

A

Decreases with altitude.

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33
Q

8337

Which direction from the primary control surface does an anti-servo tab move?

A

Same direction.

34
Q

8391.1

Swept wings

A

Increases the critical Mach number.

35
Q

8392
What is the result of a shock-induced separation of airflow occurring symmetrically near the wing root of a sweptwing aircraft?

A

A severe moment or ‘Mach tuck.’

36
Q

8350

Why must the angle of attack be increased during a turn to maintain altitude?

A

Compensate for loss of vertical component of lift.

37
Q

8361

Which engine is the ‘critical’ engine of a twin-engine airplane?

A

The one with the center of thrust closest to the centerline of the fuselage.

38
Q

8338

Which direction from the primary control surface does a servo tab move?

A

Opposite direction.

39
Q

8389

What is the free stream Mach number which produces first evidence of local sonic flow?

A

Critical Mach number.

40
Q

9767

How does Vs (KTAS) speed vary with altitude?

A

Varies directly with altitude.

41
Q

8334

Which is a purpose of leading -edge slats on high-performance wings?

A

Increase lift at relative slow speeds.

42
Q

8375

What flight condition should be expected when an aircraft leaves ground effect?

A

An increase in induced drag requiring a higher angle of attack.

43
Q

8349
If no corrective action is taken by the pilot as angle of bank is increased, how is the vertical component of lift and sink rate affected?

A

Lift decreases and the sink rate increases.

44
Q

8329

What is the purpose of an anti-servo tab?

A

Prevent a control surface from moving to a full-deflection position due to aerodynamic forces.

45
Q

9759

If the boundary layer separates

A

The wing is about to stall and stop producing lift.

46
Q

8352
What is the relationship of the rate of turn with the radius of turn with a constant angle of bank but increasing airspeed?

A

Rate will decrease and radius will increase.

47
Q

8342

Why do some airplanes equipped with inbound/outbound ailerons use the outboards for slow flight only?

A

Aerodynamic loads on the outboard ailerons tend to twist the wingtip at high speeds.

48
Q

9823

During a turn with constant power

A

The aircraft nose will pitch down.

49
Q

8353

Upon which factor does wing loading during a level coordinated turn in smooth air depend?

A

Angle of bank.

50
Q

8347

What is load factor?

A

Lift divided by the total weight.

51
Q

8336

Which is a purpose of ground spoilers?

A

Reduce the wings’ lift upon landing

52
Q

8395

What is the movement of the center of pressure when the wingtip of a sweptwing airplane are shock-stalled first?

A

Inward and forward.

53
Q

8343

Precise roll control using a rudder on a transport category airplane

A

Is difficult and therefore not recommended.

54
Q

8363

Under what condition should stalls never be practiced in a twin-engine airplane?

A

With one engine inoperative.

55
Q

8379

How can an airplane produce the same lift in ground effect as when out of ground effect?

A

A lower angle of attack.

56
Q

8393

What is one disadvantage of a sweptwing design?

A

The wingtip section stalls prior to the wing root.

57
Q

8366

What is a characteristic of longitudinal instability?

A

Pitch oscillations becoming progressively greater.

58
Q

8372
Identify the type stability if the aircraft attitude tends to move farther from its original position after the controls have been neutralized.

A

Negative static stability

59
Q

8325

When are outboard ailerons normally used?

A

Low-speed flight only.

60
Q

8356

Airflow separation over the wing can be delayed by using vortex generators

A

Making the wing surface rough and/or directing high pressure air over the top of the wing or flap through slots.

61
Q

8385

What is the primary function of the leading edge flaps in landing configuration during the flare before touchdown?

A

Prevent flow separation.

62
Q

8345.1

Generally, the turning performance of an airplane is defined by

A

Aerodynamic and structural limits at low altitude.

63
Q

9808

The stall speed of an airplane

A

Is affected by weight, and bank angle.

64
Q

9942

How does the stall speed (KCAS) vary as you climb from sea level to 33,000 feet?

A

It remains relatively unchanged throughout the climb.

65
Q

8388

What is the highest speed possible without supersonic flow over the wing?

A

Critical Mach number.

66
Q

8327

Which of the following is considered an auxiliary flight control?

A

Leading-edge flaps.

67
Q

9765

What is a difference between the Fowler flap system and split flap system?

A

Fowler flaps produce the greatest change in pitching moment.

68
Q

8376

What characteristic should exist if an airplane is loaded to the rear of its CG range?

A

Unstable about the lateral axis.

69
Q

8380

What are some characteristics of an airplane loaded with the CG at the aft limit?

A

Lowest stall speed, highest cruise speed, and least stability.

70
Q

9921

An airplane loaded with the Center of Gravity aft of the rear CG limit could

A

make it more difficult to flare for landing.

71
Q

8382

By changing the angle of attack of a wing, the pilot can control the airplane’s

A

Lift, airspeed, and drag.

72
Q

9803

Swept wings causes a significant

A

reduction in effectiveness of flaps.

73
Q

8386

What effect does the leading edge slot in the wing have on performance?

A

Change the stalling angle of attack to a higher angle.

74
Q

8367

Describe dynamic longitudinal stability.

A

Motion about the the lateral axis.

75
Q

8396
For a given angle of bank, the load factor imposed on both the aircraft and pilot in a coordinated constant-altitude turn

A

remains constant regardless of airspeed changes.

76
Q

8354
If an aircraft with a gross weight of 2,000 pounds were subjected to a total load of 6,000 pounds in flight, the load factor would be

A

3 Gs.

77
Q

8391.2

For significant benefit, wing sweep must be at least

A

30 to 35 degrees.

78
Q

9793

Upon landing, spoilers

A

function by increasing tire to ground friction.

79
Q

8399

At which speed will increasing the pitch attitude cause an airplane to climb?

A

High speed.

80
Q

9766

On which type of wing are flaps most effective?

A

Thick wing.

Dispatcher (4 decks)

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