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FAA Aviation Mechanic General (AMG) practice questions

211 free questions with answers and explanations.

Practice test
  1. 151.A shop manager tells a technician, 'The customer is waiting at the airport — get this engine back together in the next 20 minutes.' The technician skips a torque check to save time. Which Dirty Dozen factor is the primary cause of the error?Regulations, Records and Human Factors
  2. 152.A repair station heat-treats 2024 aluminum sheet by heating it to solution temperature and quenching in water. A technician notices the material continues to gain hardness over the following days at room temperature without further processing. What process accounts for this?Materials, Hardware and Processes
  3. 153.An aircraft is subject to a recurring Airworthiness Directive (AD) that requires compliance every 100 hours. In addition to the standard information required by 14 CFR 43.9, what must the mechanic also record in the maintenance record entry?Regulations, Records and Human Factors
  4. 154.A technician wants to reduce the resistance of a copper conductor without changing its material or length. Which modification will achieve this?Fundamentals of Electricity and Electronics
  5. 155.A ground crew is using an engine hoist and sling to remove a heavy powerplant from an aircraft for overhaul. Which practice is critical to prevent the engine from shifting or dropping during the lift?Ground Operations and Servicing
  6. 156.A technician is selecting a self-locking nut for installation on an engine exhaust clamp that will be exposed to temperatures exceeding 400°F. Which type of self-locking nut should be selected?Materials, Hardware and Processes
  7. 157.A sheet metal part has a surface inclined at an angle to the front, top, and side projection planes, causing that surface to appear foreshortened in all three standard orthographic views. Which type of view should be added to show the true size and shape of that inclined surface?Aircraft Drawings, Weight and Balance
  8. 158.A technician torques a bolt to a table value that assumes dry, unlubricated cadmium-plated threads. If the technician instead applies engine oil to the threads before torquing to that same table value, what is the most likely effect on the bolt's actual clamping force (preload)?Materials, Hardware and Processes
  9. 159.A large transport-category aircraft is being weighed using jacks because platform scales cannot be positioned under the main landing gear. Which precaution is most important during this jack weighing procedure?Aircraft Drawings, Weight and Balance
  10. 160.An aircraft component assembly has three weights positioned along a beam: 100 lb at station 20, 150 lb at station 60, and 50 lb at station 100. What is the location of the combined center of gravity (CG)?Physics, Math and Fluid Lines
  11. 161.A mechanic uses a hoist to lift a 550-pound engine component a vertical distance of 10 feet in 20 seconds. How much horsepower is required to perform this work (1 hp = 550 ft-lb/sec)?Physics, Math and Fluid Lines
  12. 162.A technician reviewing an illustrated parts catalog sees a three-dimensional pictorial view of a landing gear strut in which the three principal axes are drawn 120° apart and all dimensions are drawn to true scale along those axes. What type of drawing is this?Aircraft Drawings, Weight and Balance
  13. 163.A repair facility processes aluminum wing skins through a chromic acid anodizing bath prior to painting. What is the primary purpose of this process?Materials, Hardware and Processes
  14. 164.A technician must mix oil and fuel in a 20:1 ratio for a two-stroke ground support engine. If the fuel tank holds 1 gallon (128 fluid ounces) of fuel, how many ounces of oil should be added?Physics, Math and Fluid Lines
  15. 165.A technician going through a difficult divorce finds himself unable to concentrate on a wiring diagram and installs a connector backward, though he is well-rested and not being rushed by anyone. Which Dirty Dozen factor best describes this situation?Regulations, Records and Human Factors
  16. 166.A technician is testing a 12-volt lead-acid aircraft battery composed of six cells connected in series, each with a fully charged open-circuit voltage of 2.1 volts. What is the expected total open-circuit voltage of the battery?Fundamentals of Electricity and Electronics
  17. 167.A mechanic is weighing an aircraft on portable platform scales and places small wooden chocks under each wheel to keep it from rolling. The chocks weigh 2 lb each and rest on the scale platforms. How should the chock weight be handled when computing the aircraft's net weight?Aircraft Drawings, Weight and Balance
  18. 168.A technician discovers a small crack in a non-critical sheet metal skin panel during inspection. Before applying a doubler repair, the technician drills a small hole at the end of the crack. What is the purpose of this hole?Materials, Hardware and Processes
  19. 169.A mechanic checks a lead-acid aircraft battery and finds the electrolyte level below the plates. What should be added to correct the level?Ground Operations and Servicing
  20. 170.During a pushback operation, the tow tractor operator loses sight of the wing walker's hand signals momentarily. The wing walker then crosses both arms rapidly above the head. What action does this signal require?Ground Operations and Servicing
  21. 171.A technician wants to create N-type semiconductor material from pure silicon, which has 4 valence electrons per atom. Which doping element should be added to accomplish this?Fundamentals of Electricity and Electronics
  22. 172.Before departing on a flight, a pilot notices that the aircraft's Certificate of Registration is not aboard, although the Airworthiness Certificate is properly displayed at the cabin entrance. According to 14 CFR 91.203, is this aircraft eligible for flight?Regulations, Records and Human Factors
  23. 173.A materials instructor asks a student to identify the property that describes a metal's ability to be drawn into a thin wire without fracturing. Which property is being described?Materials, Hardware and Processes
  24. 174.A mechanic is reviewing an aircraft's maintenance records prior to a pre-purchase inspection. Under 14 CFR 91.417, for how long must records of the total time in service of the airframe be retained?Regulations, Records and Human Factors
  25. 175.A technician needs to join two pieces of thin-wall 4130 steel tubing on a fuselage cluster without melting the base metal. The filler metal selected flows and bonds at a temperature above 800°F but below the melting point of the tubing. Which joining process is being performed?Materials, Hardware and Processes
  26. 176.At a junction in a DC parallel circuit, two branch currents of 4 amps and 6 amps flow into the junction. According to Kirchhoff's Current Law, what must be the current flowing out of the junction through the third branch?Fundamentals of Electricity and Electronics
  27. 177.A tube has an outside diameter of 1.0 inch and a wall thickness of 0.049 inch. The tube material has an ultimate tensile strength of 40,000 psi. Using the thin-wall pressure vessel formula P = 2tS/D, what is the approximate internal burst pressure of the tube?Physics, Math and Fluid Lines
  28. 178.Hydraulic fluid flows at 8 ft/sec through a line section with a cross-sectional area of 0.60 square inch. The line then necks down to a section with an area of 0.30 square inch. Assuming incompressible flow, what is the fluid velocity in the smaller section?Physics, Math and Fluid Lines
  29. 179.A technician installs an autopilot system on a certificated airplane under an FAA-issued Supplemental Type Certificate (STC) that specifically covers that installation on that aircraft model. What must be documented on the FAA Form 337 to properly reflect FAA approval of the installation?Regulations, Records and Human Factors
  30. 180.A technician needs to determine the height of a cylindrical reservoir with a known volume of 157 cubic inches and a radius of 2 inches. Using the formula V = πr²h, what is the height of the reservoir?Physics, Math and Fluid Lines
  31. 181.A technician wants to create P-type semiconductor material by doping pure silicon, which has four valence electrons per atom. Which type of impurity atom should be added to achieve this?Fundamentals of Electricity and Electronics
  32. 182.A tool falls freely from a maintenance stand and strikes the floor after falling 64.4 feet. Using the formula d = ½gt² with g = 32.2 ft/sec² and ignoring air resistance, how long did the tool take to fall?Physics, Math and Fluid Lines
  33. 183.A mechanic must torque a fitting to 200 in-lb but cannot fit a standard wrench due to clearance, so an extension is added that increases the effective length from the pivot to the fastener by 2 inches, giving a total length of 12 inches (original wrench length was 10 inches). What torque wrench reading should the mechanic use to achieve the true 200 in-lb at the fastener?Materials, Hardware and Processes
  34. 184.A certificated repair station performs a major alteration on an aircraft under its air agency certificate and approved procedures. Regarding FAA Form 337, which statement is correct?Regulations, Records and Human Factors
  35. 185.A technician reviewing an engineering drawing wants to find the drawing number, revision letter, scale, and the name of the part depicted. Where on the drawing is this information found?Aircraft Drawings, Weight and Balance
  36. 186.A confined gas at constant pressure occupies 15 cubic inches at an absolute temperature of 500°R. If the temperature is increased to 1,000°R while pressure remains constant, what is the new volume according to Charles's Law?Physics, Math and Fluid Lines
  37. 187.A single-engine airplane operated under IFR in controlled airspace has a functioning ATC transponder installed. According to 14 CFR 91.413, how often must the transponder system be tested and inspected?Regulations, Records and Human Factors
  38. 188.A shop receives a shipment of compressed oxygen cylinders for servicing aircraft oxygen systems. Which storage practice is correct?Ground Operations and Servicing
  39. 189.A technician replaces a wing spar section that, if improperly repaired, could appreciably affect the structural strength of the aircraft. Under 14 CFR Part 43, Appendix A, this repair is classified as which type of repair?Regulations, Records and Human Factors
  40. 190.Air flows through the constricted throat of a carburetor venturi at increased velocity. According to Bernoulli's principle, what happens to the static pressure at the throat compared to the wider section of the venturi?Physics, Math and Fluid Lines
  41. 191.A technician compares two prints of the same engineering drawing and notices they carry different revision letters. Where on the drawing should the technician look to find a description of what was changed, when, and by whom?Aircraft Drawings, Weight and Balance
  42. 192.During a complex engine installation, a junior mechanic notices the lead technician torquing a fitting to a value that seems incorrect but says nothing, assuming the senior mechanic knows best. The fitting later fails. This scenario best illustrates which Dirty Dozen human factor?Regulations, Records and Human Factors
  43. 193.A technician uses the right-hand rule for conventional current flow to determine the magnetic field direction around a straight current-carrying conductor. If the thumb points in the direction of current flow, what do the curled fingers represent?Fundamentals of Electricity and Electronics
  44. 194.An aircraft is used exclusively to give flight instruction for hire and has accumulated 97 hours since its last 100-hour inspection. The nearest facility capable of performing the inspection is 2 hours away by flight time. According to 14 CFR 91.409(a), what is the mechanic's/operator's correct course of action?Regulations, Records and Human Factors
  45. 195.A technician suspects a subsurface flaw located deep within a thick aluminum landing gear forging, undetectable by eddy current or liquid penetrant methods. Which nondestructive inspection method uses high-frequency sound waves transmitted through a couplant to detect internal discontinuities at varying depths within the material?Materials, Hardware and Processes
  46. 196.A technician completes an avionics upgrade without realizing that a previous modification rerouted a bundle of wires directly behind the panel he is about to drill into, because he did not check for recent wiring changes before starting work. Which Dirty Dozen factor is illustrated?Regulations, Records and Human Factors
  47. 197.A structural repair manual lists a fuel quantity sensor location as 'WL 95.' What does this designation identify?Aircraft Drawings, Weight and Balance
  48. 198.A 24-volt aircraft battery is rated at 40 ampere-hours. If a continuous electrical load draws 8 amps, theoretically how long can the battery supply this load before it is fully discharged?Fundamentals of Electricity and Electronics
  49. 199.A technician needs a calibrated torque wrench in a specific range to properly torque critical engine fasteners, but the shop's only calibrated wrench in that range is checked out to another crew. Under time pressure, the technician uses an uncalibrated wrench and estimates the torque by feel. This scenario best represents which 'Dirty Dozen' factor?Regulations, Records and Human Factors
  50. 200.A technician is testing a three-phase AC generator. If the generator has 4 poles and is rotating at 1,800 revolutions per minute (RPM), what is the frequency of the AC output in Hertz?Fundamentals of Electricity and Electronics