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2AX5X Vol.2 URE
Question | Answer |
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1. (201) Atmospheric pressure at sea level is | a. 14.7 pounds per square inch (psi). |
2. (201) A barometer is designed to measure pressure in | b. inches of mercury. |
3. (202) The primary force an airfoil has to defeat is | d. weight. |
4. (202) The force that acts upward at a right angle to the direction of the relative wind is | a. lift. |
5. (202) The force that acts parallel to the relative wind is | b. drag. |
6. (203) The stress that resists the force tending to cause one layer of material to slide over an adjacent layer is called | d. shear. |
7. (203) What is the design that uses any combination of longerons, stringers, bulkheads and frames in the construction of the fuselage called? | d. Semi-monocoque. |
8. (203) The structural members used to give shape to the aircraft and provide a means for attaching the skin to the structure are called | c. stringers. |
9. (203) The most common type of material used for fuselage construction is | d. aluminum alloy. |
10. (203) The wing design used on most modern military aircraft is | a. cantilever. |
11. (203) The fixed vertical surface of the empennage is called the | d. fin. |
12. (203) Engine mounts are typically made of corrosion- resistant steel that is able to withstand forces of | c. 180,000 to 200,000 psi. |
13. (203) The main difference between inspection plates and panels is | a. size. |
14. (203) A network of ultrafine cracks that form on or under the surface of transparent plastics is called | a. crazing. |
15. (203) What are the reference locations in the vertical direction measured from a reference datum that is usually well below the aircraft called? | b. Waterlines. |
16. (204) Movement about the vertical axis is called | b. yaw. |
17. (204) Which flight control surface is a longitudinal control surface? | c. Elevator. |
18. (204) Which of these is attached to the trailing edge of a horizontal stabilizer? | d. Elevator. |
19. (204) When making a right turn, the relative position of the ailerons is the right aileron trailing edge is | b. up, left aileron trailing edge is down. |
20. (204) The purpose of wing flaps is to | a. increase lift and drag. |
21. (204) The purpose of aircraft trim systems is to | c. correct minor deviations in flight attitude. |
22. (205) Matter is any substance that has mass and | b. occupies space. |
23. (205) Atoms are made up of | d. protons, neutrons, and electrons. |
24. (205) Electrons can be released from their outer orbit by all of the following forces except | b. cold. |
25. (205) What is the electrical pressure that causes electrons to flow through the conductor called? | c. Electromotive force. |
26. (205) If you apply 24 volts through a total resistance of 6 ohms in a series circuit, the amperage would be | b. 4. |
27. (206) A permanent magnet is produced from a material with | b. high reluctance and low permeability. |
28. (206) When soft iron is brought close to a permanent magnet it is | d. magnetized. |
29. (206) The greater the current flow through an electromagnet, the | b. greater the strength. |
30. (207) Current flow in most aircraft circuits is controlled by | d. switches. |
31. (207) The majority of aircraft circuit protection devices are normally located | a. in the aircraft cabin. |
32. (208) What term describes current that reverses its direction at regularly recurring intervals? | d. Alternating. |
33. (208) The methods used to cool brushless alternating current (AC) generators are | b. engine oil and blast air. |
34. (208) The output of the constant speed drive (CSD) used to drive a 60/80 kilovolt ampere (KVA) generator is approximately | c. 8,000 RPM. |
35. (208) The underspeed switch (USS) on the 60/80 kilovolt ampere (KVA) generator constant speed drive (CSD) actuates at | c. 365 Hz. |
36. (208) What supplies rotary power to the input gear of the constant speed drive (CSD)? | a. Accessory gearbox. |
37. (209) A battery’s internal component that is a grid or framework which supports the active chemical materials is called the | a. plate. |
38. (209) A 24-volt nickel-cadmium battery has | b. 19 cells. |
39. (209) The nickel-cadmium battery can be fully charged only by | b. constant current. |
40. (209) What type of motor can operate on alternating current (AC) or direct current (DC)? | c. Universal. |
41. (209) A shunt-type motor has | c. low starting torque and good speed regulation. |
42. (210) The three states of matter are | d. liquids, gases, and solids. |
43. (210) When any force causes a solid to change permanently, the solid is said to have | a. passed the elastic limit. |
44. (210) The most outstanding characteristic of a liquid is its | d. ability to conform to the shape of its container. |
45. (210) What usually produces flow in a pneudraulic system? | b. Piston pushing the fluid. |
46. (210) Who was among the first to study the compressibility of gases? | b. Boyle. |
47. (211) If 50 pounds per square inch (psi) of cylinder pressure acts on a 5-square-inch piston head, what will the resulting force be? | c. 250 pounds. |
48. (211) When an 8-square-inch piston moves 5 inches within a cylinder, what volume of liquid is displaced? | b. 40 cubic inches. |
49. (211) Turbulence affects fluid-flow in a hydraulic line by | c. creating resistance and loss of energy. |
50. (211) A tube whose cross-section area is gradually reduced to a smaller size diameter is called a | d. venturi. |
51. (212) The purposes of a hydraulic reservoir are to | d. replenish fluid, allow for thermal expansion, and provide a means of bleeding air from the system. |
52. (212) The purpose of a standpipe in a reservoir is to | c. reserve fluid for the emergency pump. |
53. (212) The amount of fluid a pump produces on each cycle or revolution is called its | a. displacement. |
54. (212) When referring to hydraulic hand pumps, double-action means | a. fluid-flow is created with each stroke of the pump handle. |
55. (212) Variable-volume pumps do not require a separate pressure-regulating device in the system because | b. they have an integral compensator. |
56. (212) What provides for cooler operation in a Stratopower variable-volume hydraulic pump? | c. Creep plates. |
57. (212) In the Stratopower variable-volume pump, what holds the pistons in contact with the cam plate? | b. Nutating plate. |
58. (212) The purpose of a hydraulic motor is to convert hydraulic pressure into | a. rotary mechanical motion. |
59. (213) How is the piston installed in an accumulator? | b. Hollow end toward the air side of the accumulator. |
60. (213) The size of one micron is four | c. millionths of an inch. |
61. (213) In a hydraulic system, the hydraulic manifold provides a location where the | c. common fluid lines can come together. |
62. (214) The purpose of an actuating cylinder is to transform fluid pressure into | b. a mechanical force. |
63. (214) What pneudraulic system component uses a single-acting actuating cylinder? | c. Brake assembly. |
64. (214) What pneudraulic system component uses a double-acting balanced actuating cylinder? | d. Nosewheel steering. |
65. (214) Which actuator type slows down piston travel when the piston nears either end of the cylinder? | c. Internal snubber. |
66. (214) A manual poppet-type selector valve is in a working position when the camshaft is rotated to | d. unseat one pressure poppet and one return poppet. |
67. (214) The major advantage of the manual slide-type hydraulic selector valve is its | b. metering ability. |
68. (214) Normally, what positions hydraulic selector valves? | d. Solenoid. |
69. (214) The advantage of an electrically controlled solenoid valve is its | a. reduced weight. |
70. (214) The difference between a selector valve and a servo valve is that the | c. servo valve controls fluid-flow. |
71. (214) Another name for a flapper check valve is | b. gate check valve. |
72. (214) What is the purpose of the arrow on a check valve? | c. Show the direction of free flow through the valve. |
73. (214) Which of these allows normal operating speed of a hydraulic actuator in one direction while limiting speed in the other direction? | b. Restrictor check valve. |
74. (215) What are the basic units of a hydraulic hand pump system? | d. Reservoir, pump, actuator, and manual shutoff valve. |
75. (215) The reservoir supplies hydraulic fluid to a hand pump | c. by gravity and the suction effect of the pump. |
76. (215) When pressure in a hydraulic system with a variable-volume pump increases, the fluid-flow | c. decreases. |
77. (216) The purpose of the torsion links on a main landing gear is to | d. prevent the inner cylinder from rotating within the outer cylinder. |
78. (216) How is the motion of the landing gear control lever transmitted to the selector valve? | c. By a cable system. |
79. (216) What prevents the lock solenoid from energizing when the nose landing gear is off center? | b. Safety switch. |
80. (216) Electromagnetic devices capable of sensing magnetically conducive metal targets on landing gears are known as | b. proximity sensors. |
81. (217) A unit that is a combination of the landing gear shimmy damper and steering unit is known as | a. a steer damper. |
82. (218) What position must the landing gear control handle be in before emergency extension of the landing gear? | b. DN. |
83. (218) What slows the free fall of the main landing gear during the emergency extension sequence? | d. Snubbing mechanism. |
84. (218) The purpose of the landing gear warning horn is to | b. sound when gear is not safe. |
85. (219) Brake fade is defined as a gradual braking action | a. loss due to overheating. |
86. (219) A major disadvantage of multiple disc brakes is that they | a. warp when overheated. |
87. (219) What automatically compensates for brake wear on the segmented rotor brake? | d. Adjusters. |
88. (219) The purpose of the antiskid system is to | d. prevent wheel skid by releasing pressure from the skidding wheel. |
89. (219) The purpose of deboosters is to | b. reduce braking pressure. |
90. (220) Aircraft wheels are normally constructed of | d. magnesium and/or aluminum alloys. |
91. (220) Split wheels are balanced | c. individually by halves. |
92. (220) What maintains an airtight seal between split wheel halves? | b. An O-ring seal. |
93. (220) What prevents tire explosion from excessive heat buildup? | d. Thermal relief plugs. |
94. (220) What the type of bearings is used on aircraft wheels? | c. Tapered roller. |
95. (220) The bearing cone of an aircraft wheel bearing is also called the | b. inner race. |
96. (220) When cleaning aircraft wheels, you should not use | b. a wire brush. |
97. (220) Installed bearing races should be free of scratches, dents, and | d. overheating marks. |
98. (220) The main parts of an aircraft tire are the tread and sidewall, | a. cord body, and beads. |
99. (220) What prevents pressure buildup and separation of cord plies or tread rubber on an aircraft tire? | c. Vent holes. |
100. (220) For tires 24 inches or greater outside diameter, the tire must be removed when wear reaches the bottom of any tread groove for a continuous length of | c. 12 inches. |