1-39. 1-40. 1-41. 1-42. 1-43. 1-44. 1-45. 1-46. When in flight,    the wing spars of an aircraft-undergo bending stresses. These stresses are actually a combination of what other stresses? 1. Shear and tension 2. Bending and torsion 3. Compression and tension 4. Shear, torsion, and compression The fundamental advantage of the helicopter over the conventional aircraft is its ability to move independent of forward speed. 1. True 2. False Which of the following helicopter components provides lift? 1. The engines 2. The fuselage 3. The tail rotor 4. The rotor blades The fuselage of an H-3 helicopter is of what type of construction? Monocoque 2. Semimonocoque 3. Reinforced shell 4. Welded steel truss Which of the following terms is NOT associated with the movement of helicopter rotor blades? 1. Lag 2. Lead 3. Flip 4. Flap Rotor blade movement in relationship to the hub is limited by what component(s)? 1. The hinges 2. The gearbox 3. The transmission 4. The pitch control beam What rotor blade component is NOT made of aluminum alloy? 1. cuff 2. Spar 3. Tip cap 4. Tip pocket The resistance to stretching of an object produced by two forces pulling in opposite directions along the same straight line is known as what type of stress? 1. Shear 2. Bending 3. Torsion 4. Tension 1-47. When an aircraft is operating, which of the following components 1-48. 1-49. 1-50. 1-51. 1-52. 1-53. is subject to torsional stresses? A shock strut 2. A tailhook shank 3. A propeller shaft 4. A reservoir piston What is the world’s lightest structural metal? Steel 2. Titanium 3. Aluminum 4. Magnesium What is the largest portion of metal present in an alloy? 1. Main metal 2. Base metal 3. Foundation metal 4. Major component metal The core material of reinforced plastic consists of a honeycomb structure. 1. True 2. False The strength of all metals is closely related to what other characteristic? Hardness 2. Denseness 3. Brittleness 4. Conductivity Metals possessing which of the following properties should NOT be used in aircraft structures? 1. Ductility 2. Elasticity 3. Brittleness 4. Contraction What metallic property is necessary for sheet metal used in wing tip construction? 1. Conductivity 2. Malleability 3. Fusibility 4. Ductility 1. 4 1. 1. 1.