Natural Science Reviewer PDF

12. The total piston displacement of a specific engine is NATURAL SCIENCE REVIEWER a. Dependent on the compression ratio....

12. The total piston displacement of a specific engine is NATURAL SCIENCE REVIEWER a. Dependent on the compression ratio. b. The volume displaced by all the pistons during MATHEMATICS one revolution of the crankshaft. 1. How many gallons of fuel will be contained in a c. The total volume of all the cylinders. rectangular-shaped tank which measures 2 feet in 13. Find the area of the triangle shown. width, 3 feet in length, and 1 foot 8 inches in depth? (7.5 gal =1 cu ft ) 3” 7.5” a. 66.6 b. 75 4” c. 45 a. 12 square inches 2. What is the square root of 4 raised to the 5th power? b. 6 square inches a. 32 c. 15 square inches b. 64 14. Maximum life for a certain part is 1100 hours. c. 20 Recently, 15 of these parts were removed from 3. Select the fractional equivalent for a 0.0625-inch- different aircraft with an average life of 835.3 hours. thick sheet of aluminum. What percent of the maximum part life has been a. 1/16 achieved? b. 3/64 a. 75.9 percent c. 1/32 b. 76.9 percent 4. Which if the figure is using scientific notation? c. 75.0 percent 1. 3.47x 104 = 34, 700 15. Find the value of 10 raised to the negative sixth 2. 2(410 ) 2,097,152 power. a. 1 a. 0.000001 b. 2 b. 0.000010 c. Both 1 and 2 c. 0.0001 5. Which decimal is most nearly equal to a bend radius 16. What is the ratio of 10 feet to 30 inches? of 31/64? a. 4:1 a. 0.2065 b. 1:3 b. 0.4844 c. 3:1 c. 0.3164 17. Solve the equation. 6. What is the speed ratio of an input gear with 36 teeth -6[-9(-8+4)-2(7+3)] = meshed to a gear with 20 teeth? a. -332 a. 9:5 b. 216 b. 1:0.56. c. -96 c. 1:1.8 18. Solve the equation 2 2 √31+ √43 7. The result of 7 raised to the third power plus the = (17)2 square root of 39 is equal to a..0297. a. 349.24 b..1680. b. 34924 c..0419. c. 34324 19. Solve the equation. 8. A blueprint shows a hole of 0.171787 to be drilled. 4- 3[-6(2+3) + 4] = Which fraction size drill bit is most nearly equal? a. 82 a. 11/64 b. -25 b. 9/32 c. -71 c. 11/32 20. What size of sheet metal is required to fabricate a 9. Express 7/8 as a percent. cylinder 20 inches long and 8 inches in diameter? a. 8.75 percent (note C= pi x D) b. 875 percent a. 20 inches x25-5/32 inches. c. 87.5 percent b. 20 inches x24-9/64 inches. 10. Which alternative answer is equal to 16,300? c. 20 inches x25-9/64 inches. a. 1.63x10 to the fourth power. 21. 1.21875 is equal to b. 1.63x10 to the negative third power a. 83/64 c. 163x10 to the negative second power. b. 19/16 11. A four cylinder aircraft engine has a cylinder bore of c. 39/32 3.78 inches and is 8.5 inches deep. With the piston on 22. An engine develops 108 horse power at 87 percent bottom center, the top of the piston measures 4.0 power. What horsepower would be developed at 65 inches from the bottom of the cylinder. What is he percent power? approximate piston displacement of this engine? a. 81 a. 200 cubic inches b. 70 b. 360 cubic inches c. 61 c. 235 cubic inches 23. Select the fraction which is equal to 0.0250. 35. Convert the binary number 1111 to decimal form. a. ¼ a. 14 b. 1/40 b. 15 c. 1/400 c. 16 24. Find the square root of 1824 36. What is the ratio of a gasoline fuel load of 200 a. 42.708x10 to the negative second power gallons to one of 1680 pounds? b. 32708 a. 5:7 c..42708x10 to the second power b. 2:3 25. Find the square root of 1746 c. 5:42 a. 41.7852 37. What is defined as a group of bits representing a b. 41.7752 complete piece of information? c. 40.7742 a. Byte 26. The parts department’s profit is 12 percent on a new b. Bit part. How much does the part cost if the selling rice c. Word is $145.60? 38. Solve the equation. a. $128.13 (64x3/8) ÷ ¾ = b. $125.60 a. 18 c. $130.00 b. 24 27. Find the square root of 3,722.1835 c. 32 a. 61.00971 39. What power of 10 is equal to 1,000,000,000? b. 61.00 a. 10 to the sixth power c. 61.0097 b. 10 to the tenth power 28. A certain aircraft bolt has an overall length of 1-1/2 c. 10 to the ninth power inches, with a shank length of 1-3/16 inches, and a 40. If the volume of a cylinder with the piston at the threaded portio length of 5/8 inch. What s the grip bottom center is 84 cubic inches and the piston length. displacement is 70 cubic inches, then the a. 5625 inch compression ratio is b. 8750 inch a. 7:1 c. 3125 inch b. 1:2:1 29. Find the cube of 64 c. 6:1 a. 4 41. An airplane flying a distance of 750 miles used 60 b. 192 gallons of gasoline. How any gallons will it need to c. 262, 144 travel 2,500 miles? 30. What is the surface area of a cube where a side a. 31,250 (edge) measures 7.25 inches? b. 9,375 a. 381.078 cu. In. c. 200 b. 315.375 sq. in. 42. What is the piston displacement of a master cylinder c. 52.5625 sq. in. with a 1.5 inch diameter bore and a piston stroke of 4 31. A rectangular shaped fuel tank measures 27-1/2 inches? inches in length, ¾ foot in width, and 8-1/4 inches in a. 9.427 cubic inches depth. How (231 cu in = 1 gal) b. 7.0686 cubic inches a. 7.366 c. 6.1541cubic inches b. 8.83 43. Find the square root of 124.924 c. 170.156 a. 111.8x 10 to the third power 32. Solve the equation b. 1118x10 to the negative second power c. 1,118x10 to the negative second power (√100 + √36 − √16= 44. Compute the area of trapezoid. 4 inches a. 12 b. 60 2 inches c. 76 33. Sixty-five engines are what percent of 80 engines? 6 inches a. 81 percent a. 24 square feet b. 65 percent b. 48 square feet c. 52 percent c. 10 square feet 34. Solve the equation 45. A rectangular-shaped fuel tank measures 60 inches in (−35 + 25)(−7) + (𝜋)(16)−2 length, 30 inches in width and 12 inches in depth. √25 How many cubic feet are within the tank? a. 174.85 a. 12.5 b. 68.037 b. 15.0 c. 14.002 c. 21.0 46. What is the speed of a spur gear with 42 teeth drive a. +31.25 by a pinion gear with 14 teeth turning 420 RPM? b. -5.20 a. 588 RPM c. -31.25 b. 160 RPM 57. What is the squareroot of 16 raised to the fourth c. 140 RPM power? a. 1,024 47. Which alternative answer is equal to 5.59? b. 4,096 1. (√𝟑𝟏) + (√𝟒𝟑) ÷ 𝟏𝟕𝟐 c. 256 2. (√31 + √43) ÷ 172 58. The number 3.47x 10 to the negative fourth power is 3. ( √31 + √43) − 172 equal to 48. The radius of a piece of round stock is 7/32. Select the a. 00347 decimal which is most nearly equal to the diameter. b. 34700 a. 0.2187 c. 000347 b. 0.4375 59. Solve the equation c. 0.3531 (−5 + 23)(−2) + (3−3 )(√64) 49. If an engine is turning 1,965 rpm at 65 percent −27 ÷ 9 power, what is its maximum rpm? a. 11.9 a. 2653 b. 11.7 b. 3023 c. 11.09 c. 3242 60. Select the decimal which is most nearly equal to 50. A pinion gear with 14 teeth is driving a spur gear 77/64 with 42 teeth at 140 RPM. Determine the speed of the a. 0.08311 pinion gear. b. 0.8311 a. 588 RPM c. 1.2031 b. 420 RPM 61. Solve the equation. c. 126 RPM (32x 3/8) ÷ 1/6 = 51. Determine the area of the triangle formed by points A, B and C. A to a. 12 B=7.5 inches A to D= 16.8 inches b. 2 B C c. 72 62. Solve the equation. ½ (-30+34)5 a.10 A D b. 95 a. 42 square inches c. 160 b. 63 square inches 63. Solve the equation. c. 126 square inches [4 x -3) +(-9x2)] ÷2= 52. How much current does a 30-volt, 1/2 horsepower a. -30 motor that is 85 percent efficient draw from the bus? b. -15 (note: 1 horsepower = 746 watts) c. -5 a. 14.6 amperes 64. A rectangular shaped fuel tank measures 37-1/2 b. 12.4 amperes inches in length, 14 inches in width and 8-1/4 inches c. 14.3 amperes in depth. How many cubic inches are within the tank? 53. Which of the following is the square root of (-1776)/ a. 59.75 (-2)-632? b. 433.125 a. 128 c. 4331.25 b. 256 65. Compute the area of the trapezoid c. 16 9’ 54. What force is exerted on the piston in a hydraulic 5’ cylinder if the area of piston is 1.2 square inches and the fluid pressure is 850 PSI? 12’ a. 1,020 pounds a. 52.5 square feet b. 960 pounds b. 60 square feet c. 850 pounds c. 76.5 square feet 55. A 6 cylinder engine with bore of 3.5 inches, a cylinder 66. Express 5/8 as a percent height of 7 inches and a stroke of 4.5 inches will have a. 625 percent total piston displacement of b. 6.25 percent a. 256.88 cubic inches c. 62.5 percent b. 259.77 cubic inches 67. An engine of 98 horse power maximum Is running at c. 43.3 cubic inches 75 percent power. What is the horsepower being 56. Solve the equation. developed? −4√125 = −6√−36  a. 87.00 7. Which of the following is a main determinant of the b. 33.30 dwell time to use when conducting a dye r fluorescent c. 73.50 penetrant inspection? 68. Solve the equation. a. The size and shape of the discontinuities (-3+2) (-12 – 4)+(-4+6) x3 being looked for a. 20 b. The size and shape of the part being b.22 inspected c.28 c. The type and/or density of the part material 69. Select the container size that will be equal in volume 8. Which statement relating to the residual magnetizing to 60 gallons on fuel. (7.5 gal = 1 cu ft) inspection method is true? a. 7.5 cubic ft a. Subsurface discontinuities are made readily b. 8.0 cubic feet apparent c. 8.5 cubic feet b. It is used in practically all circular and 70. Solve the equation. longitudinal magnetizing procedures -4+6+103 (√1296) = c. It may be used with steels which have been a. 35,998 heat treated for stressed applications b. 36002 9. In examining and evaluating a welded joint, a c. 62,208 mechanic should be familiar with a. Likely ambient exposure conditions and MATERIALS AND PROCESSES intended use of the part, along with type of weld and original part material 1. Which statement regarding aircraft bolts is correct? composition a. When tightening castellated nuts on drilled bolts, b. The welding technique, filler material, if the cotter pin holes do not line up, it is and temperature range used permissible to overtighten the nut to permit c. The parts, proportions, and formation of alignment of the next slot with the cotter pin a weld hole 10. Circular magnetization of a part can be used to detect b. In general, bolt grip lengths should equal the which defects? material thickness a. Defects parallel to the long axis of the part c. Alloy steel bolts smaller than ¼ -inch diameter b. Defects perpendicular to the long axis of the should not be used in primary structure part 2. How many of these factors are considered essential c. Defects perpendicular to the concentric knowledge for x-ray exposure? circles of magnetic force within the part 1. Processing of the film 11. (1) In nondestructive testing a discontinuity may be 2. Material thickness and density defined as an interruption in the normal physical 3. Exposure distance and angle structure or configuration of a part 4. Film characteristics (2) A discontinuity may or may not affect the a. One usefulness of a part b. Three Regarding the above statements, c. Four a. Only No.1 is true 3. What precision measuring tool is used for measuring b. Only No.2 is true crankpin and main bearing journals for out-of-round c. Both No.1 and No.2 are true wear? 12. In performing a dye penetrant inspection, the a. Dial gauge developer b. Micrometer caliper a. Seeps into a surface crack to indicate the c. Depth gauge presence of a defect 4. On a fillet weld, the penetration requirement includes b. Acts as a blotter to produce a visible indication what percentage(s) of the base metal thickness? c. Thoroughly cleans the surface prior to inspection a. 100 percent 13. If it is necessary to accurately measure the diameter b. 25 – 50 percent of a hole approximately ¼ inch in diameter, the c. 60 – 80 percent mechanic should use a 5. What is descriptive of the annealing process of steel a. Telescoping gauge and determine the size of during after it has been annealed? the hole by taking a micrometer reading of a. Rapid cooling; high strength the adjustable end of the telescoping gauge b. Slow cooling; low strength b. 0 - to 1-inch inside micrometer and read the c. Slow cooling; increased resistance to wear measurement directly from the micrometer 6. Which tool can be used to determine piston pin out- c. Small-hole gauge and determine the size of the of-round wear? hole by taking a micrometer reading of the ball a. Telescopic gauge end of the gauge b. Micrometer caliper c. Dial indicator 14. What method of magnetic particle inspection is used c. A homogeneous mixture of pure aluminum most often to inspect aircraft parts for invisible and aluminum alloy cracks and other defects? 24. Which of the following defects are not acceptable for a. Residual metal lines? b. Inductance 1. Cracked flare c. Continuous 2. Seams 15. What two types of indicating mediums are available 3. Dents in the heel of a bend less than 20% of the for magnetic particle inspection? diameter a. Iron and ferric oxides 4. Scratches/nicks on the inside of a bend less than b. Wet and dry process materials 10% of wall thickness c. High retentivity and low permeability material 5. Dents in straight section that are 20% of tube 16. If dye penetrant inspection indications are not sharp diameter and clear, the most cause is that part a. 1,2,3,4 and 5 a. Was not correctly degaussed before the developer b. 1,2 and 3 was applied c. 1,2,3 and 5 b. Has no appreciable damage 25. Which heat-treating process of metal produces a c. Was not thoroughly washed before the hard, wear-resistant surface over a strong, tough developer was applied core? 17. What aluminum alloy designations indicate that the a. Case hardening metal has received no hardening or tempering b. Annealing treatment c. Tempering a. 3003-F 26. Generally speaking, bolt grip lengths should be b. 5052-H36 a. Equal to the thickness of the material which c. 6061-O is fastened together, plus approximately one 18. Which heat-treating operation would be performed diameter when the surface of the metal is changed chemically b. Equal to the thickness of the material by introducing a high carbide or nitride content? which is fastened together a. Tempering c. One and one half times the thickness of the b. Normalizing material which is fastened together c. Case hardening 27. Which of the following describe the effects of 19. Unless otherwise specified, torque values for annealing steel and aluminum alloys? tightening aircraft nuts and bolts relate to 1. Decrease in internal stress a. Clean, dry threads 2. Softening of the metal b. Clean, lightly oiled threads 3. Improved corrosion resistance c. Both dry and lightly oiled threads a. 1,2 20. What nondestructive testing method requires little or b. 1,3 no part preparation, is used to detect surface or near- c. 2,3 surface defects in most metals, and may also be used 28. A bolt with an X inside a triangle on the head is to separate metals or alloys and their heat-treat classified as an conditions? a. NAS standard aircraft bolt a. Eddy current inspection b. NAS close tolerance bolt b. Ultrasonic inspection c. AN corrosion-resistant steel bolt c. Magnetic particle inspection 29. When checking an item with the magnetic particle 21. How is the locking feature of the fiber-type locknut inspection method, circular and longitudinal obtained? magnetization should be used to a. By the use of an unthreaded fiber locking a. Reveal all possible defects insert b. Evenly magnetize the entire part b. By a fiber insert held firmly in place at the base c. Ensure uniform current flow of the load carrying section 30. Unless otherwise specified or required, aircraft bolts c. By making the threads in the fiber insert slightly should be installed so that the bolthead is smaller than those in the load carrying section a. Upward, or in rearward direction 22. When the specific torque value for nuts is not given, b. Upward, or in a forward direction where can the recommended torque value be found? c. Downward, or in a forward direction a. AC 43. 13-1B 31. (1) An aircraft part may be demagnetized by b. Technical Standard Order subjecting it to a magnetizing force from alternating c. AC43. 13-2A current that is gradually reduced in strength 23. Alclad is a metal consisting of (2) An aircraft part may be demagnetized by a. Aluminum alloy surface layers and a pure subjecting it to a magnetizing force from direct aluminum core current that is alternately reversed in direction b. Pure aluminum surface layers on an and gradually reduced in strength aluminum alloy core Regarding the above statements,  a. Both No. 1 and No. 2 are true 40. Identify the correct statement b. Only No.2 is true a. An outside micrometer is limited to c. Only No.1 is true measuring diameters 32. The society of Automotive Engineers (SAE) and the b. Tools used on certificated aircraft must be American Iron and Steel Institute use a numerical an approved type index system to identify the composition of various c. Dividers do not provide a reading when steels. In the number ‘4130’ designating chromium used as measuring device molybdenum steel, the first digit indicates the 41. One characteristics of a good weld is that no oxide a. Percentage of the basic element in the alloy should be formed on the base metal at a distance b. Percentage of carbon in the alloy in from the weld of more than hundredths of a percent a. ½ inch c. Basic alloying element b. 1 inch 33. Which of the following occurs when a mechanical c. ¼ inch force is repeatedly applied to most metals at room 42. Which statement regarding aircraft bolts is correct? temperature, such as rolling, hammering, or bending? a. When tightening castellated nuts on drilled 1. The metals become artificially aged. bolts, if the cotter pin holes do not line up, it 2. The metals become stress corrosion cracked is permissible to overtighten the nut to 3. The metals become cold worked, strain or work permit alignment of the next slot with the hardened cotter pin hole a. 2 b. In general, bolt grip lengths should equal b. 1 and 3 the material thickness c. 3. c. Alloy steel bolts smaller than ¼-inch 34. Which of the following materials may be inspected diameter should not be used in primary using the magnetic particle inspection method? structure 1. Magnesium alloys 43. What is generally used in the construction of aircraft 2. Aluminum alloys engine firewalls? 3. Iron alloys a. Stainless steel 4. Copper alloys b. Chrome-molybdenum alloy steel 5. Zinc alloys c. Titanium nickel alloy a. 1,2,3 44. Why is it considered good practice to normalize a part b. 1,2,3,4 after welding? c. 3 a. To relieve internal stresses developed 35. What is steel tempered after being hardened within the base metal a. To increase its hardness and ductility b. To increase the hardness of the weld b. To increase its strength and decrease its c. To remove the surface scale formed during internal stresses welding c. To relieve its internal stresses and reduce 45. Aircraft bolts are usually manufactured with a its brittleness a. Class 1 fit for the threads 36. Which condition indicates a part has cooled too b. Class 2 fit for the threads quickly after being welded? c. Class 3 fit for the threads a. Cracking adjacent to the weld 46. A fiber-type, self-locking nut must never be used on b. Discoloration of the base metal an aircraft if the bolt is c. Gas pockets, porosity, and slag inclusions a. Under shear loading 37. How is the locking feature of the fiber-type locknut b. Under tension loading obtained? c. Subject to rotation a. By the use of an unthreaded fiber locking 47. The aluminum code number 1100 identifies what type insert of aluminum b. By a fiber insert held firmly in place at the a. Aluminum alloy containing 11 percent copper base of the load carrying section b. Aluminum alloy containing zinc c. By making the threads in the fiber insert c. 99 percent commercially pure aluminum slightly smaller than those in the load 48. Magnetic particle inspection is used primarily to carrying section detect 38. Which material cannot be heat treated repeatedly a. Distortion without harmful effects? b. Deep surface flaws a. Unclad aluminum alloy in sheet form c. Flaws on or near the surface b. 6061-T9 49. The clearance between the piston rings and the ring c. Clad aluminum alloy lands is measured with a 39. Which number represents the Vernier scale a. Micrometer calliper graduation of a micrometer? b. Thickness gauge a..00001 c. Depth gauge b..001 c..0001 50. Which type crack can be detected by magnetic 59. How is a clevis bolt used with a fork-end cable particle inspection using either circular or terminal secured? longitudinal magnetization a. With a shear nut tightened to a snug fit, a. 45° but with no strain imposed on the fork and b. Longitudinal safe tied with a cotter pin c. Transverse b. With a castle nut tightened until slight 51. Where is an AN clevis bolt used in an airplane binding occurs between the fork and the a. For tension and shear load conditions fitting to which it is being attached b. Where external tension loads are applied c. With a shear nut and cotter pin or thin self- c. Only for shear load applications locking nut tightened enough to prevent 52. In magnetic particle inspection, a flaw that is rotation of the bolt in the fork perpendicular to the magnetic field flux lines 60. The testing medium that is generally used in generally causes magnetic particle inspection utilizes a ferromagnetic a. A large disruption in the magnetic field material that has b. A minimal disruption in the magnetic field a. High permeability and low retentivity c. No disruption in the magnetic field b. Low permeability and high retentivity 53. What type of corrosion may attack the grain c. High permeability and high retentivity boundaries of aluminum alloys when the heat 61. To detect a minute crack using dye penetrant treatment process has been improperly inspection usually requires accomplished? a. That the developer be applied to a flat a. Concentration cell surface b. Intergranular b. A longer-than-normal penetrating time c. Fretting c. The surface to be highly polished 54. Select a characteristics of a good gas weld 62. A mechanic has completed a bonded honeycomb a. The depth of penetration shall be sufficient repair using the potted compound repair technique. to ensure fusion off the filler rod What nondestructive testing method is used to b. The height of the weld bead should be 1/8 determine the soundness of the repair after the repair inch above the base metal has cured? c. The weld should taper off smoothly into a. Eddy current test the base metal b. Metallic ring test 55. The twist of a connecting rod is checked by installing c. Ultrasonic test push-fit arbors in both ends, supported by parallel 63. What may be used to check the stem on a poppet-type steel bars on a surface plate. Measurements are taken valve for stretch? between the arbor and the parallel bar with a a. Dial indicator a. Dial gauge b. Micrometer b. Height gauge c. Telescoping gauge c. Thickness gauge 64. What defects will be detected by magnetizing a part 56. The core material of Alclad 2024-T4 is using continuous longitudinal magnetization with a a. Heat-treated aluminum alloy, and the cable? surface material is commercially pure a. Defects perpendicular to the axis of the aluminum part b. Commercially pure aluminum, and the b. Defects parallel to the long axis of the part surface material is heat-treated aluminum c. Defects parallel to the concentric circles of alloy magnetic force within the part c. Strain- hardened aluminum alloy, and the 65. Which of the following methods may be suitable to surface material is commercially pure use to detect cracks open to the surface in aluminum aluminum forgings and castings? 57. Which tool is used to measure the clearance between 1. Dye penetrant inspection a surface plate and a relatively narrow surface being 2. Magnetic particle inspection checked for flatness? 3. Metallic ring (coin tap) inspection a. Depth gauge 4. Eddy current inspection b. Thickness gauge 5. Ultrasonic inspection c. Dial indicator 6. Visual inspection 58. What tool is generally used to calibrate a micrometer a. 1,4,5,6 or check its accuracy? b. 1,2,4,5,6 a. Gauge block c. 1,2,3,4,5,6 b. Dial indicator 66. How can the dimensional inspection of a bearing in a c. Machinist scale rocker arm be accomplished? a. Depth gauge and micrometer b. Thickness gauge and push-fit arbor c. Telescopic gauge and micrometer 67. Which tool can be used to measure the alignment of a 75. Which tool is used to find the center of a shaft or rotor shaft or the plane of rotation of a disk? other cylindrical work a. Dial indicator a. Combination set b. Shaft gauge b. Dial indicator c. Protractor c. Micrometer caliper 68. Holes and a few projecting globules are found in a 76. Normalizing is a process of heat treating weld. What action should be taken? a. Aluminum alloys only a. Reweld the defective portions b. Iron-base metal only b. Remove all the old weld, and Reweld the c. Both aluminum alloys and iron-base metals joint 77. Under magnetic particle inspection, a part will be c. Grind the rough surface smooth, inspect, and identified as having a fatigue crack under which Reweld all gaps/holes condition? 69. A particular component is attached to the aircraft a. The discontinuity pattern is straight structure by the use of an aircraft bolt and a castle b. The discontinuity is found in a nonstressed tension nut combination. If the cotter pin hole does area of the part not align within the recommended torque range, the c. The discontinuity is found in a highly acceptable practice is to stressed area of the part a. Exceed the recommended torque range by no 78. Which of these nondestructive testing methods is more than 10 percent suitable for the inspection of most metals, plastics b. Tighten below the torque range and ceramics for surface and subsurface defects? c. Change washers and try again a. Eddy current inspection 70. Liquid penetrant inspection methods may be used on b. Magnetic particle inspection which of the following? c. Ultrasonic inspection 1. Porous plastics 79. What metal has special short-time heat properties 2. Ferrous metals and is used in the construction of aircraft firewalls? 3. Nonferrous metals a. Stainless steel 4. Smooth primer-sealed wood b. Chrome molybdenum alloy steel 5. Nonporous plastics c. Titanium alloy a. 2,3,4 80. The reheating of het treated metal, such as with a b. 1,2,3 welding torch c. 2,3,5 a. Has little or no effect on a metal’s heat 71. Why should an aircraft maintenance technician be treated characteristics familiar with weld nomenclature? b. Has a cumulative enhancement effect on the a. So that accurate visual (pictorial) original heat treatment comparisons can be made c. Can significantly alter a metal’s properties b. In order to gain familiarity with the in the reheated area welding technique, filler material and 81. The pattern for an inclusion is a magnetic particle temperature range used build up forming c. In order to compare welds with written a. A fernlike pattern (non-pictorial) description standards b. A single line 72. Aircraft bolts with a cross or asterisk marked on the c. Parallel lines bolthead are 82. In the four-digit aluminum index system number a. Made of aluminum alloy 2024, the first digit indicates b. Close tolerance bolts a. The major alloying element c. Standard steel bolts b. The number of major alloying elements used 73. Select a characteristics of a good gas weld in the metal a. The depth of penetration shall be sufficient c. The percent of alloying metal added to ensure fusion of the filler rod 83. A bolt with a single raised dash on the head is b. The height of the weld bead should be 1/8 classified as an inch above the base metal a. AN corrosion-resistant steel bolt c. The weld should taper off smoothly into b. NAS standard aircraft bolt the base metal c. NAS close tolerance bolt 74. One way a part may be demagnetized after magnetic 84. A part which is being prepared for dye penetrant particle inspection is by inspection should be clean with a. Subjecting the part to high voltage, low a. A volatile petroleum-based solvent amperage ac b. The penetrant developer b. Slowly moving the part out of an ac c. Water-base solvents only magnetic field of sufficient strength 85. What tool is generally used to set a divider to an c. Slowly moving the part into an ac magnetic exact dimension? field of sufficient strength a. Machinist scale b. Surface gauge c. Dial indicator Basic physics 8. If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will 1. Which statement concerning heat and/or temperature is a. Triple true? b. Be reduced to one third its original volume a. The speed of sound in the atmosphere energy c. Remain the same of the molecules of any substance 9. Which atmospheric conditions will cause the true b. There is an inverse relationship between landing speed of an aircraft to be the greatest? temperature and heat a. Low temperature with low humidity c. Temperature is a measure of the kinetic b. High temperature with low humidity energy of the molecules of any substance c. High temperature with high humidity 2. The boiling point of a given liquid varies 10. Which of the following is newton’s first law of motion, a. Directly with pressure generally termed the law of inertia b. Inversely with pressure a. To every action is an equal and opposite c. Directly with density reaction 3. If a double acting actuating cylinder in a 3000 psi system b. Force is proportional to the product of mass has a piston with a surface rea of three square inches on and acceleration the extension side, and a rod with a cross-section area of c. Everybody persists in its state of rest, or one square inch attached to the piston on the other side, of motion in a straight line, unless acted approximately how much force will the actuator be able upon by some force. to produce when retracting? 11. Which of the following is NOT considered a method of a. 9,000 pounds heat transfer? b. 6,000 pounds a. Convection c. 3,000 pounds b. Conduction 4. Which is the ratio of the water vapor actually present c. Diffusion in the atmosphere to the amount that would be present 12. Which will weigh the least? if the air were saturated at the prevailing temperature a. 98 parts of dry air and 2 parts of water and pressure vapor a. Absolute humidity b. 35 parts of dry air and 65 parts of water a. Relative humidity vapor b. Dewpoint c. 50 parts of dry air and 50 parts of water 5. An airplane wing is designed to produce lift resulting vapor from 13. Aspect ratio of a wing is defined as the ratio of the a. A positive air pressure below and above the a. Wingspan to the wing root wing’s surface along with the downward b. Square of the chord to the wingspan deflection of air c. Wingspan to the mean chord b. Positive air pressure below the wing’s 14. Under which conditions will the rate of flow of a liquid surface and negative air pressure above through a metering orifice (or jet) be the greatest (all the wing’s surface along with the other factors being equal)? downward deflection of air. a. Unmetered pressure,18 PSI;metered c. Negative air pressure below the wing’s pressure,17.5 PSI;atmospheric pressure 14.5 surface and positive air pressure above the PSI wing’s surface along with the downward b. Unmetered pressure,23 PSI; metered defection of air. pressure, 12 PSI;atmospheric pressure 14.3 6. If the volume of a confined gas is doubled (without the PSI addition of more gas), the pressure will (assume the c. Unmetered pressure, 17 PSI; metered temperature remains constant) pressure, 5 PSI; atmospheric pressure, a. Increase In direct proportion to the volume 14.7 PSI increase 15. Which condition is actual amount of water vapor in a b. Remain the same mixture of air and water? c. Be reduced to one half its original value a. Relative humidity 7. If all or a significant part of a stall strip is missing on an b. Dewpoint airplane wing, a likely result will be. c. Absolute humidity a. Asymmetrical lateral control at a near 16. In physics, which of the following factors are necessary stall angles of attack to determine power? b. Decreased lift In the area of installation at 1. Force exerted high angles 2. Distance moved c. Asymmetrical lateral control at low angles of 3. Time required attack. a. 1 and 2 b. 2 and 3 c. 1,2 and 3 17. The speed of sound in the atmosphere is most affected by 26. What is absolute humidity? variations in which of the following? a. The temperature to which humid air must be a. Sound frequency (cps) cooled at constant pressure to become b. Ambient temperature statured. c. Barometric pressure b. The actual amount of the water vapor in a 18. The desire effect of using winglets on an aircraft’s mixture of air and water. wingtips is to c. The ratio of the water vapor actually present a. Increase the lift to drag ratio in the atmosphere to the amount that would b. B. reduce the aspect ratio be present if the air were saturated at the c. Optimize wing dihedral and improve lateral prevailing temperature and pressure. stability 27. The purpose of aircraft wing dihedral is to 19. If the fluid pressure is 800 psi in a ½ inch line a. Increase lateral stability supplying an actuating cylinder with a piston area of b. Increase longitudinal stability 10 square inches, the force exerted on the piston will c. Increase lift coefficient of the wing be 28. The speed of sound in the atmosphere a. 4000 pounds a. Varies according to the frequency of the b. 8000 pounds sound c. 800 pounds b. Changes with a change in temperature 20. Temperature is a measure of the potential If both the c. Changes with a change in pressure volume and the absolute temperature of a confined gas 29. An engine that weighs 350 pounds is removed from an are doubled, the pressure will aircraft by means of a mobile hoist. The engine is raised a. Not change 3 feet above its attachment mount, and the entire b. Be halved assembly is then moved forward 12 feet. Constant force c. Become four times as great of 70 pounds is required to move the loaded hoist. What 21. The purpose of stall strips on airplane wings is to is the total work input required to move the hoist? a. Increase lift in the areas of installation a. 840 foot pounds b. Prevent stall in the areas of installation b. 1,890 foot pounds c. Ensure that the wing root areas stall first c. 1,050 foot pounds 22. A wing with very high aspect ratio (in comparison with low aspect ratio wing) will have. a. Increased drag at high angles of attack b. A low stall speed c. Poor control qualities at low airspeeds 23. How much work input is required to lower (not drop) a 120 pound weight from the top of a 3 foot table to the floor. a. 120 pounds of force b. 360 foot-pounds c. 40 foot-pounds 24. What force must be applied to roll a 120 pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)? L÷I=R÷E L = length of ramp, measured along the slope I = height of ramp R = weight of object to be raised or lowered. E = Force required to raise or lower object a. 40 pounds b. 120 pounds c. 360 pounds 25. The temperature to which humid air must be cooled at constant pressure to become saturated is called a. Dew point b. Absolute humidity c. Relative humidity