1. What is the system that controls the direction in which a plane flies?
Answer
Correct Answer:
Flight Control Systems
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2. What type of system has the disadvantage of having flammable fluids?
Answer
Correct Answer:
Hydraulic system
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3. What theory describes the idealised flow of a propeller disk?
Answer
Correct Answer:
Froude’s
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4. What is the process known as when resonance occurs?
Answer
Correct Answer:
Excitation
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5. What does divergence stiffness go to zero as?
Answer
Correct Answer:
Buckling instability
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6. What type of mode is present in the coupled mode flutter graph?
Answer
Correct Answer:
Two
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7. What value does the torsion mode and bending mode asymptote?
Answer
Correct Answer:
Critical velocity of flutter
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8. When does coupled mode flutter occur?
Answer
Correct Answer:
When the real part of the damping is zero
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9. Along with coupled mode flutter, what happens when the real part of the damping is zero?
Answer
Correct Answer:
Critical velocit
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10. What can you do to simplify the static equation?
Answer
Correct Answer:
Simplify with symmetric wing
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11. What is the first step in Lagrange formalism?
Answer
Correct Answer:
First, write out the degrees of freedom
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12. What type of fatigue is due to Sonic?
Answer
Correct Answer:
Due to vibrations excited by jet / propeller noise
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13. Stress fluctuations induced by thermal expansion are known as what?
Answer
Correct Answer:
Thermal fatigue
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14. What does fretting fatigue cause?
Answer
Correct Answer:
Small scale rubbing movement/abrasion of adjacent parts
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15. What type of corrosion develops on a material that is exposed to moisture?
Answer
Correct Answer:
Corrosion fatigue
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16. What causes corrosion fatigue?
Answer
Correct Answer:
Surface corrosion
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17. What is a property of cyclic fatigue?
Answer
Correct Answer:
Repeated fluctuation loads
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18. What is the scientific term for cyclic fatigue?
Answer
Correct Answer:
Repeated fluctuation loads
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19. How many types of fatigue are in aircraft structures?
Answer
Correct Answer:
Five
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20. What is the goal of the Master event sequence?
Answer
Correct Answer:
Development of flight by flight for spectrum of 1900 cycles
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21. What kind of manoeuvres should a mission have in order to withstand gust loads?
Answer
Correct Answer:
Ground
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22. How many flight cycles are in the spectrum for fatigue evaluation for transport planes?
Answer
Correct Answer:
1,000
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23. What is the name of the mission that represents a/c structural life defined?
Answer
Correct Answer:
Missions that represent a/c structural life defined
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24. What is the term for the failure of an aircraft due to a defect in the construction of the airframe?
Answer
Correct Answer:
Structural failure
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25. Along with corrosion, what event can cause a plane to break apart from its constituent parts?
Answer
Correct Answer:
Fatigue
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26. What is the period of time during which aircraft structure is reasonably free from significant cracking?
Answer
Correct Answer:
Design service goal
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27. How long does the structure retain the required residual strength?
Answer
Correct Answer:
A period of use
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28. What does the residual strength plot give information about?
Answer
Correct Answer:
How much less loads/stress a part can withstand with a growing crack
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29. In which facility is curved panel testing done?
Answer
Correct Answer:
Level 4
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30. What type of testing is performed on aircraft components on Level 3?
Answer
Correct Answer:
Structural components
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31. What is the term for tests on structural details?
Answer
Correct Answer:
Level 2
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32. What are the tests done on at the second level of testing?
Answer
Correct Answer:
Structural details
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33. What level of testing is Coupon tests?
Answer
Correct Answer:
Level 1
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34. In what area are coupon tests conducted?
Answer
Correct Answer:
Aircraft testing
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35. What are coupon tests?
Answer
Correct Answer:
Stress-strain diagrams
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36. What term refers to the ratio of minimum stress to maximum stress?
Answer
Correct Answer:
Stress ratio
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37. What does the secondary structure of a building act as?
Answer
Correct Answer:
Air
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38. What does the secondary structure of a plane do?
Answer
Correct Answer:
Carries only air
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39. What are the primary structural elements?
Answer
Correct Answer:
Aircraft structure elements
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40. What is an example of insufficient torsional stiffness?
Answer
Correct Answer:
Control reversal
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41. What is the name of the Torsional stiffness not sufficient to maintain structure in a stable position as speed increases?
Answer
Correct Answer:
Divergence on a wing
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42. What can Flutter on a wing be compared to?
Answer
Correct Answer:
Dynamic instability of elastic structure in an airstream
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43. What is the result of increasing speeds on a wing?
Answer
Correct Answer:
Dynamic instability of the elastic structure
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44. What is a single event?
Answer
Correct Answer:
Static loading
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45. What are multiple events as cycles with variable stress levels called?
Answer
Correct Answer:
Dynamic loading
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46. What is an example of the interaction of flow with aircraft structural components?
Answer
Correct Answer:
Aeroelasticity
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47. What does aeroelasticity refer to?
Answer
Correct Answer:
Structural response
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48. What are the loads on components due to unsteady flow?
Answer
Correct Answer:
Buffeting loads
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49. What aspect of an aircraft's structure responds to external atmospheric disturbances?
Answer
Correct Answer:
Dynamic response
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50. What is one example of an external atmospheric disturbance?
Answer
Correct Answer:
Gusts
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51. What can flutter occur on besides aircraft?
Answer
Correct Answer:
Structures
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52. What kind of vibration occurs when a lifting surface bends?
Answer
Correct Answer:
Flutter
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53. What is an example of a dynamic aeroelastic phenomenon?
Answer
Correct Answer:
Dynamic Aeroelasticity studies the interactions among aerodynamic, elastic, and inertial forces
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54. What type of forces are involved in dynamic aeroelasticity?
Answer
Correct Answer:
Aerodynamic, elastic, and inertial forces
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55. What is the term used to describe the interactions among aerodynamic, elastic, and inertial forces?
Answer
Correct Answer:
Dynamic Aeroelasticity
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56. What type of deformation can cause control surface reversal?
Answer
Correct Answer:
Structural
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57. What is the loss of expected response of a control surface?
Answer
Correct Answer:
Control surface reversal
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58. When does divergence occur?
Answer
Correct Answer:
When a lifting surface deflects under aerodynamic load
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59. When a structure deflects under aerodynamic load, it is said to have experienced what phenomenon?
Answer
Correct Answer:
Divergence
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60. What type of interaction between aerodynamic and elastic forces is aeroelasticity?
Answer
Correct Answer:
Static aeroelasticity studies
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61. The interaction between what two types of forces is studied by aeroelasticity?
Answer
Correct Answer:
Aerodynamic and elastic
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62. What property is not significant in a study of aeroelasticity?
Answer
Correct Answer:
Mass properties
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63. What does the term 'buffeting' refer to?
Answer
Correct Answer:
A high-frequency instability
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64. What is another name for the high frequency instability caused by airflow separation or shock wave oscillations from one object striking another?
Answer
Correct Answer:
Buffeting
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65. What is the flutter speed of an aircraft that flies through transonic Mach numbers?
Answer
Correct Answer:
Close to flight speed
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66. In which year was the first report of "transonic dip"?
Answer
Correct Answer:
1976
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67. Failures of what lead to flutter on aircraft?
Answer
Correct Answer:
Engine supports
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68. Which company had an accident due to flutter in 1959?
Answer
Correct Answer:
Braniff Flight 542
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69. What structure is supporting the rotating propeller in flutter?
Answer
Correct Answer:
Nacelle
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70. What is another name for flutter?
Answer
Correct Answer:
Propeller whirl flutter
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71. Failure of engine supports caused the phenomenon known as what?
Answer
Correct Answer:
Whirl flutter
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72. What can cause the destruction of an aircraft?
Answer
Correct Answer:
Flutter
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73. Flutter refers to the destruction of an aircraft due to what?
Answer
Correct Answer:
The uncontained vibration
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74. What is the term used to describe the vibration that can lead to the destruction of an aircraft?
Answer
Correct Answer:
Flutter
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75. What type of moment does reversal of control activation produce?
Answer
Correct Answer:
Aerodynamic
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76. Where does control reversal occur?
Answer
Correct Answer:
Control reversal where control activation produces an opposite aerodynamic moment
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77. What causes control reversal?
Answer
Correct Answer:
Control activation
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78. What increases the angle of attack of wing?
Answer
Correct Answer:
Aerodynamic forces
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79. Where do aerodynamic forces increase the angle of attack of a wing?
Answer
Correct Answer:
Divergence
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80. Where does divergence occur?
Answer
Correct Answer:
Divergence where the aerodynamic forces increase the angle of attack of a wing
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81. What type of response is dynamic aeroelasticity concerned with?
Answer
Correct Answer:
Vibrational
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82. What is the study of the interactions between the inertial, elastic and aerodynamic forces occurring while an elastic body is exposed to a fluid flow?
Answer
Correct Answer:
Aeroelasticity
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