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Peters1103
Final Review
| Question | Answer |
|---|---|
| Which property of sheet metal is most important when selecting a material to be formed into curved shapes such as fairings and wheel parts? | a. Malleability b. Ductilty c. Elasticity |
| Aircraft aluminum skins are easily worked because it possesses these two characteristics. | a. It’s malleable and ductile b. It’s elastic and strong c. It’s permeable and hard |
| The aluminum code number 1100 identifies what type of aluminum | a. Aluminum alloy containing copper b. Aluminum alloy containing zinc c. 99% commercially pure aluminum |
| What is the main alloying element of 2024 aluminum | a. Zinc b. Copper c. Magnesium |
| What aluminum alloy designation indicates that the metal has received no hardening or tempering treatment? | a. 2024-F b. 6063-O c. 7002-T3 |
| The cast housing of a turbine engine gearbox must be quenched during the heat treatment process. Which of the following has the slowest cooling potential? | a. Oil b. Water c. Brine |
| When torqueing a nut and bolt, to ensure the most accurate result, it is best to | a. Apply torque to the bolt head b. Apply torque to the nut c. Lubricate the threads before torquing |
| Normalizing is a process of heat treating for | a. Aluminum alloys only b. Iron-base metals only c. Both aluminum alloys and iron based metals |
| Why is steel tempered after being hardened? | a. To increase its hardness and ductility b. To increase its strength and decrease its internal stresses c. To relieve its internal stresses and reduce brittleness |
| Case hardening may be in the form of | a. Carburizing, nitriding, or cyaniding b. Nitrating, cycling, or quenching c. Carburizing, neutralizing, or sanitizing |
| The core material of alclad 2024-T4 is | a. Heat treated aluminum alloy, and the surface is commercially pure aluminum b. Commercially pure aluminum, and the surface is heat treated aluminum alloy c. Strain hardened aluminum alloy, and the surface material is commercially pure aluminum |
| Regarding the use of respirators when working with composite material; which is the best indication that the masks filters need to be replaced? | a. You can smell resin with the mask on b. The mask is clogged with debris, making breathing more difficult c. The expiration date of the mask has passed |
| What type of synthetic rubber offers the best resistance to aviation fuels and oils and is therefore used for fuel hoses, fuel tank linings, and gaskets. | a. Buna-N b. Buna-S c. Neoprene |
| A class three bolt thread is | a. A tight fit b. A loose fit c. A medium fit |
| When is a AN clevis bolt used in an airplane | a. For tension and shear load conditions b. For area where external tension loads are applied c. Only for shear load applications |
| A bolt with a raised or recessed triangle on the head is classified as | a. NAS standard aircraft bolt b. NAS close tolerance bolt c. AN corrosion resistant steel bolt |
| Aircraft nuts are made of stainless steel, anodized 2024T aluminum alloy, or | a. Copper plated carbon steel b. Copper plated nickel steel c. Cadmium plated carbon steel |
| Which precaution must be taken every time a self locking nut is used on an aircraft | a. The head of the bolt must be safety wired b. A lock washed must be used with the nut c. Ensure the bolt is not subject to rotation |
| The looking feature of the nylon type locknut is obtained by | a. The use of an unthreaded nylon locking insert b. A nylon insert held firmly in place at the base of the load carrying section c. Making the threads in the nylon insert slightly smaller than those in the load carrying section |
| Unless otherwise specified or required, aircraft bolts should be installed so the bolt head is facing | a. Upward, or in a rearward direction b. Upward, or in a forward direction c. Downward, or in a forward direction |
| A helicoil insert is used | a. To replace damaged rivets in aircraft structures b. To replace damaged threads in aircraft structures c. When the next smaller size bolt is desired |
| Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to | a. Clean, dry threads b. Clean, lightly oiled threads c. Both dry and oiled threads |
| Which type of specialty fastener would be best suited to secure an aircraft cowling? | a. Camloc fasteners b. Dzus fasteners c. Turnlock fasteners |
| What is the most common reason why a fastener may become loose and so must be safetied in some way upon installation? | a. Corrosion b. Insufficient torque c. Vibration |
| Safety wire is always installed in a manner which | a. Exerts tension on the fastener b. Attaches the fastener to a fixed object c. Immobilizes the fastener |
| Which of these materials is the most anodic? | a. Cadmium b. Aluminum 1100 c. Magnesium |
| In most cases corrosion on an aluminum surface appears as | a. Whisker like deposits b. White or grey powder c. A rough surface varying in colors |
| 1. In the corrosion process, it is the cathodic area or dissimilar cathodic material that corrodes 2. In the galvanic or electro-chemical series for metals, the most anodic metals are those that will give up electrons most easily | a. Only 1 is true b. Only 2 is true c. Both are true |
| Which of these materials is most cathodic? | a. Zinc b. 2024 Aluminum Alloy c. Stainless Steel |
| Of the following, when and/or where is galvanic corrosion most likely to occur? | a. When an electrolyte covers the surface of an aluminum skin, seeps into the cracks between lap joints, and oxygen is excluded from the area b. At the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte |
| In which way is filiform corrosion best removed? | a. Solvents b. Abrasive blasting c. Filiform corrosion can not be removed |
| Which is the best method to detect intergranular corrosion? | a. Mag-Particle inspection b. Ultrasonic inspection c. Liquid Penetrant |
| Galvanic corrosion is most likely to be most rapid and severe when the surface area of the | a. Cathodic metal is smaller that the surface area of the anodic metal b. Anodic and cathodic metals are approximately the same c. Anodic metal is smaller than the surface area of the cathodic metal |
| Which of the following may not be detectable even by careful visual inspection of the surface of aluminum alloy parts or structures ? | a. Filiform corrosion b. Intergranular corrosion c. Uniform etch corrosion |
| The lifting and flaking of the metal at the surface due to delamination of the grain boundaries caused by the pressure of corrosion residual product buildup is called | a. Brinelling b. Granulation c. Exfoliation |
| Corrosion problems downstream of engine exhaust areas is caused by | a. Chemical makeup of exhaust gasses b. Heat from engine exhaust c. Moisture mixed in the exhaust gasses |
| Fretting corrosion is most likely to occur | a. When 2 surfaces fit tightly together but can move relative to one another b. Only when 2 dissimilar metals are in contact c. When 2 surfaces fit loosely together and can move relative to one another |
| In which area of a piano hinge type attachment to a control surface is corrosion most likely to occur? | a. Contact between the hinge halves b. Contact between the hinge and hinge pin c. Contact between the hinge and flight control |
| Which procedure is recommended to keep aircraft control cables free of corrosion? | a. Keep cables clean and dry b. Keep cable routing as straight as possible and free of unnecessary tension c. Keep cables coated with a light oil film |
| Ferrous oxide corrosion is typically formed by | a. Atmospheric humidity b. Dissimilar metal contact c. Exposure to a slight but constant electrical charge |
| What is the principal benefit of an alclad aluminum surface? | a. It is easy to keep clean b. Pure aluminum is less susceptible to corrosion than aluminum alloys c. The hardened surface protects internal structure of material |
| When an anodized surface coating is damaged in service, it can be partially restored by | a. Applying a thin coat of zinc chromate primer b. Chemical surface treatment c. Use of a suitable mild cleaner |
| Corrosion should be removed from magnesium parts with a | a. Silicon carbide brush b. Carborundum abrasive c. Stiff, hog bristle brush |
| A nonelectrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint bonding qualities is called | a. Anodizing b. Alodizing c. Dichromating |
| Which of the following is an acceptable first step procedure to help prevent scratching when cleaning a transparent plastic surface? | a. Gently wipe the surface with clean water b. Flush the surface with clean water c. Gently wipe the surface with a clean, soft cloth moistened with demineralized or distilled water |
| Select the solvent used to clean acrylics and rubber | a. Aliphatic naptha b. Methyl Ethyl Ketone c. Aromatic Naptha |
| The best tool for cutting aluminum tubing, or any tubing of moderately soft metal is a | a. Hand operated wheel-type tubing cutter b. Fine tooth hacksaw c. Circular-saw equipped with an abrasive cutting wheel |
| Metal tubing fluid lines are sized by wall thickness and | a. Outside diameter in 1/16th inch increments b. Inside diameter in 1/16th inch increments c. Outside diameter in 1/32nd inch increments |
| Which statement is true regarding flattening of tubing in bends? | a. Flattening by a maximum of 20% of the original diameter is permissible b. Flattening by not more than 25% of the original diameter is permissible c. Thesmall diameter position in the bend cannot exceed more than 75% of the diameter of straight tubing |
| When bending metal tubing, what is the maximum amount of flattening permissible in the bend area of the tube? | a. Flattened portion diameter not less than 75% of the original tube diameter b. Flattened portion diameter not less than 50% of the original tube diameter c. Flattened portion diameter not less than 2/3rds the original tube diameter |
| Flexible hose used in aircraft systems is classified in size according to the | a. Outside diameter b. Wall thickness c. Inside diameter |
| Which of the following may be a result of over-torquing a flareless tube fitting | a. A deformed joint resulting in leakage b. Weakening of the tube leading to failure c. A crushed tube causing a blockage of flow |
| A gas or fluid line marked with the letters PHDAN is | a. A dual purpose pneumatic and/or hydraulic line for normal and emergency system use b. Used to carry physically dangerous materials c. A pneumatic or hydraulic system drain or discharge line |
| If a standard AN flared fitting is colored black, what material is it made from? | a. Aluminum b. Bronze c. Steel |
| When joining and torquing flared tubes and fittings, | a. Apply sealing compound between the fitting and flare b. Apply lubricant between the fitting and flare c. Assure the connection is clean and dry |
| A scratch or nick in aluminum tubing can be repaired, provided it does not | a. Appear in the heel of a bend b. Appear on the inside of the bend c. Exceed 10% of the tube OD on a straight section |
| Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than | a. 20% of the wall thickness b. 1/32 inch or 20% of wall thickness, whichever is less c. 10% of the wall thickness |
| A flexible hose marked with the MIL-H-3000-Size-4-3/23. What does the 3/23 mean? | a. The hose was manufactured in the third quarter of 2023 b. The hose was manufactured in March of 2023 c. The hoses service life expires in March of 2023 |
| The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to | a. Clear obstacles and make turns in aircraft structures b. Provide for access within aircraft structures c. Prevent excessive stress on the tubing |
| Which of the following materials are compatible with phosphate-ester base hydraulic fluids? 1. Butly 2. Teflon 3. Buna-N 4. Neoprene | a. 1 and 2 b. 2 and 4 c. 1 and 3 |
| The term cold flow is generally associated with | a. The effects of low temperature gasses or liquids flowing in the hose or tubing. b. Impressions left in natural synthetic rubber hose material c. Flexibility characteristics of various hose materials at low ambient temperatures |
| Flexible fluid lines must be installed with | a. Enough slack to allow maximum flexing during operation b. Slack equal to approximately 5% of their length c. Snuggly around its path to prevent entanglement with other lines or components |
| When installing bonded clamps to support metal tubing, | a. Paint removal from tube is not recommended as it will increase corrosion b. Repaint clamp and tube after clamp installation to prevent corrosion c. Remove paint and anodizing from tube at clamp location |
| If a flexible hose with swaged fittings develops a leak; | a. The hose may be repaired with a factory approved sleeve b. Refit a new length of hose within the fittings c. The complete hose assembly with fittings must be replaced |
| When must a flexible hose assembly be pressure checked? | a. Upon its manufacturer b. During each annual or 100 hour inspection c. When an inspection of the hose suggests it has deteriorated |
| A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it | a. Expands in length and diameter b. Expands in length and contracts in diameter c. Contracts in length and expands in diameter |
| What type of pliers are typically used for twisting safety wire? | a. Round nose pliers b. Duckbill pliers c. Needle Nose pliers |
| Which file type will provide the smoothest cut and finest finish | a. Vixen file b. Mill file c. Double round file |
| Which tap type is used to cut full threads in a blind hole? | a. A taper tap b. A plug tap c. A bottom tap |
| Which system provides the most accuracy in measuring drill bit diameters | a. The numbering system sizes 1-80 b. The lettering system, sizes A-Z c. The fraction system by 64th of an inch |
| Which number is represents the vernier scale graduation of a micrometer? | a. .01 b. .001 c. .0001 |
| Identify the correct statement | a. An outside micrometer is limited to measuring diameters b. Tools used on certified aircraft must be an approved type c. Dividers do not provide a reading when used as a measuring device |
| What tool is generally used to set a divider to an exact dimension? | a. Machinist scale or rule b. Surface Gauge c. Dial indicator |
| If it is necessary to accurately measure the diameter of a hole approximately ¼” in diameter, the mechanic should use a | a. Telescoping gauge determine the size of the hole by taking a micrometer reading of the adjustable end of gauge c. Small hole gauge determines the size of the hole by taking a micrometer reading of the ball end of the gauge. |
| Which of the following is not an appropriate use of a center punch? | a. Removing rivets from holes b. Transfer dimensions from a paper template to metal c. Create an indentation to start a twist drill. |
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cpeters2
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