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Question Aerodynamics

The document consists of a series of questions and multiple-choice answers related to aerodynamics, aircraft control surfaces, and flight mechanics. It covers topics such as the effects of angle of attack, types of flaps, control surfaces, and the principles of lift and drag. Each question tests knowledge on specific aspects of aviation and aerodynamics, providing options for the correct answers.

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0% found this document useful (0 votes)
21 views10 pages

Question Aerodynamics

The document consists of a series of questions and multiple-choice answers related to aerodynamics, aircraft control surfaces, and flight mechanics. It covers topics such as the effects of angle of attack, types of flaps, control surfaces, and the principles of lift and drag. Each question tests knowledge on specific aspects of aviation and aerodynamics, providing options for the correct answers.

Uploaded by

hafidhadam2002
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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1. If the angle of attack is increased, it usually leads to an increase in what?

Option A. Speed

Option B. Lift

Option C. Drag

Option D. Drag coefficient

2. When flying straight and level, moving the control stick to the right will raise what on the right
wing?

Option A. Flap

Option B. Elevator

Option C. Rudder

Option D. Aileron

3. Ailerons on each wing are used for what?

Option A. Make the aircraft roll

Option B. Aid in flight

Option C. Control the aircraft's attitude

Option D. Change the aircraft's flight path

4. What are the four basic types of aircraft?

Option A. Airplanes, jets and submarines

Option B. Planes, helicopters and blimps

Option C. Airplanes, helicopters, dirigibles and balloons

Option D. Airplanes, helicopters, blimps and jets

5. Which of the following will increase the Critical Mach Number of an aerofoil?.
Option A. Using a thin airfoil and sweeping the wings back.
Option B. Decreasing the fineness ratio of the wings.
Option C. Increasing the aspect ratio of the wings.

6. As an aircraft accelerates through the transonic region, the centre of pressure tends
to.
Option A. turn into a shock wave.
Option B. move rearward.
Option C. move forward.

7. Mach trim in some aircraft assists.


Option A. lateral stability.
Option B. vertical stability.
Option C. longitudinal stability.

8. Before an aircraft reaches critical mach.


Option A. the nose pitches up because the CP moves Forward.
Option B. the aircraft buffets because the CP moves to the shock wave.
Option C. the nose pitches down because the CP moves rear.

9. On a standard day, at which altitude will the speed of sound be the greatest?.
Option A. 20,000 ft.
Option B. 10,000 ft.
Option C. Sea level.

10. A symmetrical aerofoil is accelerating through Mach 1 with an angle of attack of 0°. A shock
wave will form.
Option A. on the upper and lower surface and will move aft until the point of maximum
camber.
Option B. on the upper and lower surface and will move aft.
Option C. on the upper surface only and move aft.

11. Shock stall.


Option A. occurs at high speeds.
Option B. is a flap down stall and occurs at high speeds.
Option C. occurs at low speeds.

12. As you approach supersonic speed.


Option A. thrust is reduced.
Option B. total drag is increased.
Option C. lift is reduced.

13. An elevator controls the aircraft motion in.


Option A. yaw.
Option B. roll.
Option C. pitch.

14. Air above Mach 0.7 is.


Option A. compressible only when above the speed of sound.
Option B. incompressible.
Option C. compressible.

15. If an aircraft is yawing left, the trim tab on the rudder would be positioned.
Option A. to the right, moving the rudder left.
Option B. to the centre.
Option C. to the left, moving the rudder right.

16. Instability giving roll and yaw.


Option A. is dutch roll.
Option B. is longitudinal stability.
Option C. is lateral stability.
17. Vortex generators are fitted to.
Option A. move transition point rearwards.
Option B. move transition point forwards.
Option C. advance the onset of flow separation.

18. Leading edge flaps.


Option A. increase stalling angle of the wing.
Option B. decrease stalling angle of the wing.
Option C. do not change the stalling angle.

19. Krueger flaps are on.


Option A. the leading edge.
Option B. either the leading or training edge.
Option C. the trailing edge.

20. Sweepback will.


Option A. decrease lateral stability.
Option B. not affect lateral stability.
Option C. increase lateral stability.

21. A plain flap.


Option A. does not increase the wing area on deployment.
Option B. is attached to the leading edge of the wing.
Option C. forms part of lower trailing edge.

22. A split flap, when deployed.


Option A. is used only on high speed aircraft.
Option B. increases lift without a corresponding increase in drag.
Option C. increases drag with little lift coefficient increase, from intermediate to fully down.

23. Which leading edge device improves the laminar flow over the wing?.
Option A. Flap and slat.
Option B. Slat.
Option C. Flap.

24. The balance tab is an auxiliary surface fitted to a main control surface.
Option A. operating automatically to assist the pilot in moving the controls.
Option B. operated independently at which point in the length of cable the tensiometer is
applied.
Option C. operating automatically to provide feel to the controls.

25. Aerodynamic balancing of flight controls is achieved by.


Option A. placing a weight ahead of the hinge point.
Option B. placing a weight in the leading edge of the control surface.
Option C. providing a portion of the control surface ahead of the hinge point.
26. Aerodynamic balance is used to.
Option A. reduce the control load to zero.
Option B. make the flying controls easier to move.
Option C. prevent flutter of the flying controls.

27. Aerodynamic balance of a control surface may be achieved.


Option A. by a horn at the extremity of the surface forward of the hinge line.
Option B. by weights added to the control surface aft of the hinge line.
Option C. by a trimming strip at the trailing edge of the surface.

28. A wing flap which has dropped or partially extended on one wing in flight will lead to.
Option A. a fixed banked attitude which would be corrected by use of the rudder.
Option B. a pitching moment which would be corrected by used of the elevators.
Option C. a steady rolling tendency which would be corrected by use of the ailerons.

29. With an increase in the amount of flap deployment, the stalling angle of a wing.
Option A. remains the same.
Option B. increases.
Option C. decreases. .

30. A differential aileron control system results in.


Option A. aileron drag being reduced on the inner wing in a turn.
Option B. aileron drag being reduced on the outer wing in a turn.
Option C. aileron drag being compensated by small rudder movements.

31. The primary function of a flap is.


Option A. to trim the aircraft longitudinally.
Option B. to alter the position of the centre of gravity.
Option C. to alter the lift of an aerofoil.

32. The angle of attack at which stall occurs.


Option A. can be varied by using flaps and slats.
Option B. depends on the weight of the aircraft.
Option C. cannot be varied, it is always constant.

33. The stalling speed of an aircraft.


Option A. is increased when it is heavier.
Option B. does not change.
Option C. is increased when it is lighter.

34. The aircraft stalling speed will.


Option A. only change if the MTWA were changed.
Option B. be unaffected by aircraft weight changes since it is dependant upon the angle of
attack.
Option C. increase with an increase in weight.

35. In a bank and turn.


Option A. extra lift is not required if thrust is increased.
Option B. extra lift is not required.
Option C. extra lift is required.

36. The method employed to mass balance control surfaces is to.


Option A. fit bias strips to the trailing edge of the surfaces.
Option B. attach weights forward of the hinge line.
Option C. allow the leading edge of the surface to project into the airflow.

37. What is a controlling factor of turbulence and skin friction?.


Option A. Countersunk rivets used on skin exterior.
Option B. Aspect ratio.
Option C. Fineness ratio.

38. Changes in aircraft weight.


Option A. cause corresponding changes in total drag due to the associated lift change.
Option B. will not affect total drag since it is dependant only upon speed.
Option C. will only affect total drag if the lift is kept constant.

39. When an aircraft stalls.


Option A. lift increases and drag decreases.
Option B. lift and drag increase.
Option C. lift decreases and drag increases.
Correct Answer is. lift decreases and drag increases.

40. A control surface which forms a slot when deployed is called a.


Option A. slat.
Option B. slot.
Option C. flap.

41. Asymmetric flaps will cause.


Option A. the aircraft to descend.
Option B. the aircraft to ascend.
Option C. one wing to rise.

42. When airflow velocity over an upper cambered surface of an aerofoil decreases, what takes
place?.
Option A. Pressure decreases, lift increases.
Option B. Pressure increases, lift decreases.
Option C. Pressure increases, lift increases.

43. Which of the following is not a primary flying control?.


Option A. Elevator.
Option B. Tailplane.
Option C. Rudder.

44. A leading edge slat is a device for.


Option A. increasing the stalling angle of the wing.
Option B. decreasing the stalling angle of the wing.
Option C. decreasing wing drag.

45. A Krueger flap is.


Option A. a flap which extends rearwards but does not lower.
Option B. a leading edge flap which hinges forward.
Option C. a leading edge slat which extends forward.

46. A tab which assists the pilot to move a flying control by moving automatically in the opposite
direction to the control surface is called a.
Option A. servo tab.
Option B. geared balance tab.
Option C. trim tab.

47. What is attached to the rear of the vertical stabilizer?.


Option A. Elevator.
Option B. Aileron.
Option C. Rudder.

48. What is fitted on the aircraft to enable the pilot to reduce his speed rapidly in event of severe
turbulence, or speed tending to rise above the Never Exceed Limit?.
Option A. Lift dumpers.
Option B. Air brakes.
Option C. Wheel brakes.

49. When spoilers are used asymmetrically, they combine with.


Option A. ailerons.
Option B. rudder.
Option C. elevators.

50. "What is used to correct any tendency of the aircraft to move


towards an undesirable flight attitude?."
Option A. Trim tabs.
Option B. Spring tabs.
Option C. Balance tabs.

51. The layer of air over the surface of an aerofoil which is slower moving, in relation to the rest of
the airflow, is known as.
Option A. none of the above are correct.
Option B. camber layer.
Option C. boundary layer.

52. The type of flap which extends rearwards when lowered is called a.
Option A. plain flap.
Option B. split flap.
Option C. Fowler flap.
Correct Answer is. Fowler flap.

53. Which of the following trailing edge flaps give an increase in wing area?.
Option A. Split flap.
Option B. Fowler flap.
Option C. Slotted flap.

54. What is the term used for the amount of water in the atmosphere?.
Option A. Relative humidity.
Option B. Absolute humidity.
Option C. Dew point. .

55. An anti-balance tab is moved.


Option A. via a fixed linkage.
Option B. hydraulically.
Option C. when the C.G. changes.

56. A servo tab is operated.


Option A. directly by the pilot to produce forces which in turn move the main control
surfaces.
Option B. automatically, and moves in the same direction as the main control surfaces.
Option C. by a trim wheel and moves in the opposite direction to the main control surfaces
when moved.

57. Dutch roll is.


Option A. a combined yawing and rolling motion.
Option B. primarily a pitching instability.
Option C. a type of slow roll.

58. Wing loading of an aircraft.


Option A. varies with dynamic loading due to air currents.
Option B. is independent of altitude.
Option C. decreases with density.

59. An automatic slat will lift by itself when the angle of attack is.
Option A. high.
Option B. high or low.
Option C. low.

60. Which flap will increase wing area and camber?.


Option A. Slot.
Option B. Split.
Option C. Fowler.

61. Slats.
Option A. keep the boundary layer from separating for longer.
Option B. increase the overall surface area and lift effect of wing.
Option C. act as an air brake.

62. Due to the change of lift forces resulting from the extension of flaps in flight.
Option A. nose should be lowered, reducing AOA.
Option B. nose should be raised, increasing AOA.
Option C. nose should remain in the same position, maintaining same AOA.

63. What effect does lowering the flaps for take-off have?.
Option A. Increases lift & reduces drag.
Option B. Increases lift and drag.
Option C. Increase lift only.
Correct Answer is. Increases lift and drag.

64. What effect does lowering flaps for takeoff have?.


Option A. Reduces takeoff speeds only.
Option B. Reduces landing speeds only.
Option C. Reduces takeoff and landing speeds.

65. If an aircraft is aerodynamically stable.


Option A. aircraft returns to trimmed attitude.
Option B. CofP moves back.
Option C. aircraft becomes too sensitive.

66. What are ground spoilers used for?.


Option A. To assist the aircraft coming to a stop.
Option B. To slow the aircraft.
Option C. To dump lift.

67. Mass balance weights are used to.


Option A. balance the trailing edge of flying control surfaces.
Option B. counteract flutter on control surfaces.
Option C. balance the tabs.

68. What is a slot used for?.


Option A. Increased angle of attack during approach.
Option B. Increase the speed of the airflow.
Option C. To reinforce the boundary layer.

69. Angle of Attack is the angle between cord line and.


Option A. horizontal axis.
Option B. relative air flow.
Option C. tip path plane.

70. A high lift device is used for.


Option A. take-off only.
Option B. take-off and landing.
Option C. landing only.

71. Servo tabs.


Option A. enable the pilot to bring the control surface back to neutral.
Option B. move in such a way as to help move the control surface.
Option C. provide artificial feel.

72. Spring Tabs.


Option A. provide artificial feel.
Option B. enable the pilot to bring the control surface back to neutral.
Option C. move in such a way as to help move the control surface.

73. Extending a leading edge slat will have what effect on the angle of attack of a
wing?.
Option A. Increase the angle of attack.
Option B. Decrease the angle of attack.
Option C. No effect on angle of attack.

74. To ensure that a wing stalls at the root first, stall wedges are.
Option A. installed on the wing leading edge at the wing root.
Option B. installed on the wing leading edge at the wing tip.
Option C. installed at the wing trailing edge at the wing root.

75. Krueger flaps make up part of the.


Option A. wing lower surface leading edge.
Option B. wing lower surface trailing edge.
Option C. wing upper surface leading edge.

76. The stall margin is controlled by.


Option A. speed bug cursor.
Option B. EPR limits.
Option C. angle of attack and flap position.

77. Other than spoilers, where are speed brakes located?.


Option A. Under the Fuselage.
Option B. Either side of the Fuselage.
Option C. On the wing.

78. With a trailing edge flap being lowered, due to rising gusts, what will happen to the angle of
attack?.
Option A. Tend to decrease.
Option B. Stay the same.
Option C. Tend to increase.

79. A device used do dump lift from an aircraft is.


Option A. leading edge flaps.
Option B. trailing edge flaps.
Option C. spoiler.

80. The purpose of a slot in a wing is to.


Option A. provide housing for the slat.
Option B. speed up the airflow and increase lift.
Option C. act as venturi, accelerate the air and re-energise boundary layer.

81. Large flap deployment.


Option A. causes increased span wise flow towards tips on wing upper surface.
Option B. causes increased span wise flow towards tips on wing lower surface.
Option C. has no effect on span wise flow.

82. Which part of the wing of a swept-wing aircraft stalls first?.


Option A. Tip stalls first.
Option B. Both stall together.
Option C. Root stalls first.

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