Metallic Structures Part 1

8138: The primary alloying agent of 2024-T3 is indicated by the number A-2. B-20. C-24.

A-2.

8139: Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture? A-2. B-17. C-20.

A-2.

8112: Which is correct concerning the use of a file? A-Apply pressure on the forward stroke, only, except when filing very soft metals, such as lead or aluminum. B-A smoother finish can be obtained by using a double-cut file than by using a single-cut file. C-The terms "double-cut" and "second-cut" have the same meaning in reference to files.

A-Apply pressure on the forward stroke, only, except when filing very soft metals, such as lead or aluminum.

8061: What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure? A-Prime the repair with a corrosion inhibitor and seal from the atmosphere. B-Paint the outside area with several coats of exterior paint. C-None. Honeycomb is usually made from a man-made or fibrous material which is not susceptible to corrosion.

A-Prime the repair with a corrosion inhibitor and seal from the atmosphere.

8042: A main difference between Lockbolt/Huckbolt tension and shear fasteners(other than their application) is in the A-number of locking collar grooves. B-shape of the head. C-method of installation.

A-number of locking collar grooves.

8045: The shop head of a rivet should be A-one and one-half times the diameter of the rivet shank. B-one-half times the diameter of the rivet shank. C-one and one-half times the diameter of the manufactured head of the rivet.

A-one and one-half times the diameter of the rivet shank.

8120: Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally A-repairable, using approved methods. B-repairable, except when subjected to compressive loads. C-not repairable, but must be replaced when damaged or deteriorated.

A-repairable, using approved methods.

8117: When straightening members made of 2024-T4, you should A-straighten cold and reinforce. B-straighten cold and anneal to remove stress. C-apply heat to the inside of the bend.

A-straighten cold and reinforce.

8114: When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be A-the shear strength of the riveted joint. B- to use rivet spacing similar to a seam in the skin. C-that the bond between the patch and the skin is sufficient to prevent dissimilar metal corrosion.

A-the shear strength of the riveted joint.

8058: When repairing puncture-type damage to a metal-faced laminated honeycomb panel, the edges of the doubler should be tapered to A-two times the thickness of the metal. B-100 times the thickness of the metal. C-whatever is desired for a neat, clean appearance.

B-100 times the thickness of the metal.

8115: Which procedure is correct when using a reamer to finish a drilled hole to the correct size? A-Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole. B-Turn the reamer only in the cutting direction. C-Apply considerable pressure on the reamer when starting the cut and reduce the pressure when finishing the cut.

B-Turn the reamer only in the cutting direction.

8118: Clad aluminum alloys are used in aircraft because they A-are naturally corrosion resistant, so they do not require corrosion resistant materials for protection. B-have surface layers of pure aluminum or aluminum alloy bonded to the core material to inhibit corrosion. C-are highly corrosion resistant because an oxide film forms on their surfaces upon contact with air.

B-have surface layers of pure aluminum or aluminum alloy bonded to the core material to inhibit corrosion.

8044: The general rule for finding the proper rivet diameter is A-three times the thickness of the materials to be joined. B-two times the rivet length. C-three times the thickness of the thickest sheet.

C-three times the thickness of the thickest sheet.

8107: Which Statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded? A-If rivets show no visible distortion, further investigation is unnecessary B-If bearing failure has occurred, the rivet shanks will be joggled. C-If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction.

C-If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction.

8175: The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked A-one-half radius from either bend tangent line. B-one radius from either bend tangent line. C-one radius from the bend tangent line that is placed under the brake.

C-one radius from the bend tangent line that is placed under the brake.

8116: Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually A-not permitted. B-permitted only if the damage does not exceed 6 inches in any direction. C-permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.

C-permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.

8123: Parts fabricated Alclad 2024-T3 aluminum sheet stock must have all A-bends made with a small radius to develop maximum strength. B-bends 90º to the grain. C-scratches, kinks, tool marks, nicks, etc., held to a minimum.

C-scratches, kinks, tool marks, nicks, etc., held to a minimum.

8170: You can distinguish between aluminum and aluminum alloy by A-filing the metal. B-testing with an acetic acid solution. C-testing with a 10 percent solution of caustic soda.

C-testing with a 10 percent solution of caustic soda.

8046: One of the main advantages of HI-LOK type fasteners over earlier generations is that A-they can be removed and reused again. B-the squeezed on collar installation provides a more secure, tighter fit. C-they can be installed with ordinary hand tools.

C-they can be installed with ordinary hand tools.

8161: If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be a placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be A-distributed evenly over the face of the aluminum at all times rather than being started at the edges or center. B-started by tapping the aluminum lightly around the edges and gradually working down into the center. C-started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions.

B-started by tapping the aluminum lightly around the edges and gradually working down into the center.