1213. A fiber-type, self-locking nut must never be used on an aircraft if the bolt is under shear loading. under tension loading. subject to rotation.
1214. Aircraft bolts with a cross or asterisk marked on the bolthead are made of aluminum alloy. close tolerance bolts. standard steel bolts.
1215. Alclad is a metal consisting of aluminum alloy surface layers and a pure aluminum core. pure aluminum surface layers on an aluminum alloy core. a homogeneous mixture of pure aluminum and aluminum alloy.
1216. Generally speaking, bolt grip lengths should be equal to the thickness of the material which is fastened together, plus approximately one diameter. equal to the thickness of the material which is fastened together. one and one half times the thickness of the material which is fastened together.
1217. Normalizing is a process of heat treating aluminum alloys only. iron-base metals only. both aluminum alloys and iron-base metals.
1218. The reheating of a heat treated metal, such as with a welding torch has little or no effect on a metal's heat treated characteristics. has a cumulative enhancement effect on the original heat treatment. can significantly alter a metal's properties in the reheated area.
1219. The Society of Automotive Engineers (SAE) and the American Iron and Steel Institute use a numerical index system to identify the composition of various steels. In the number '4130' designating chromium molybdenum steel, the first digit indicates the percentage of the basic element in the alloy. percentage of carbon in the alloy in hundredths of a percent. basic alloying element.
1220. Unless otherwise specified or required, aircraft bolts should be installed so that the bolthead is upward, or in rearward direction. upward, or in a forward direction. downward, or in a forward direction.
1221. Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to clean, dry threads. clean, lightly oiled threads. both dry and lightly oiled threads.
1222. What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment? 3003-F. 5052-H36. 6061-0.
1223. What is descriptive of the annealing process of steel during and after it has been annealed? Rapid cooling; high strength. Slow cooling; low strength. Slow cooling; increased resistance to wear.
1224. What is generally used in the construction of aircraft engine firewalls? Stainless steel. Chrome-molybdenum alloy steel. Titanium nickel alloy.
1225. What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment process has been improperly accomplished? Concentration cell. Intergranular. Fretting.
1226. Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content? Tempering. Normalizing. Case hardening.
1227. Which heat-treating process of metal produces a hard, wear- resistant surface over a strong, tough core? Case hardening. Annealing. Tempering.
1228. Which material cannot be heat treated repeatedly without harmful effects? Unclad aluminum alloy in sheet form. 6061-T9 stainless steel. Clad aluminum alloy.
1229. Which of the following describe the effects of annealing steel and aluminum alloys? decrease in internal stress and softening of the metal. decrease in internal stress and improved corrosion resistance. softening of the metal and improved corrosion resistance.
1230. Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending? The metals become stress corrosion cracked. The metals become artifically age and the metals become cold worked, strain or work hardened. The metals become cold worked, strain or work hardened.
1231. Which statement regarding aircraft bolts is correct? When tightening castellated nuts on drilled bolts, if the cotter pin holes do not line up, it is permissible to overtighten the nut to permit alignment of the next slot with the cotter pin hole. In general, bolt grip lengths should equal the material thickness. Alloy steel bolts smaller than 1/4- inch diameter should not be used in primary structure.
1232. Why is steel tempered after being hardened? To increase its hardness and ductility. To increase its strength and decrease its internal stresses. To relieve its internal stresses and reduce its brittleness.
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