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Vol #2 - 2A551

100 Q & A

1. (201) The maintenance stand with an adjustable height of 13 to 20 feet is the B–2.
2. (201) Of the following, the maintenance stand that is a scissor-type is the B–4.
3. (201) The type of jack normally used to change a tire on the aircraft is the axle.
4. (201) The boiling point of liquid oxygen (LOX) is –297°F.
5. (201) The low- and high-pressure capabilities, as measured in pounds per square inch gage (psig),of the NSU-L75 nitrogen-servicing unit are 0–350; 350–3,600.
6. (201) The high-pressure pump provides a hydraulic filler pressurization unit with a maximum pressure of 3,000 psi.
7. (201) The model 4000 engine trailer can support a maximum load of 8,000 pounds.
8. (202) The usable pressure range, as measured in pounds per square inch (psi), of the MC–1A air compressor is 0–3,200.
9. (202) The MC–2A air compressor is capable of delivering air at a maximum pressure, measured in pounds per square inch (psi), of 200.
10. (202) The H–1 heater has an adjustable heat output that ranges from 150°F to 280°F.
11. (202) The stationary, skid-mounted power unit that produces aircraft electrical power for use in shops and hangars is the MD-4
12. (202) The unit capable of providing both alternating current (AC) and direct current (DC) electrical power in addition to pneumatic power for ground maintenance is the A/M32A–60.
13. (202) The hydraulic systems on the MK–3A–1 hydraulic test stand are designated No. 1 and No. 2.
14. (202) The amount of fluid the MJ–2A reservoir holds is 27 gallons.
15. (202) A Class I MB–2 tractor weighs 40,000 pounds.
16. (203) The structural members, whose chief use is to give shape to the aircraft and provide a means for attaching the skin to the structure, are called stringers.
17. (203) The most common type of material used for fuselage construction is aluminum alloy.
18. (203) The wing components that provide strength and contour shape to the wing are the ribs.
19. (203) The main difference between inspection plates and panels is size.
20. (203) A cracked radome could cause microwave distortion.
21. (203) The reference locations, which are in the vertical direction measured from a reference datum that is usually well below the aircraft, are called Waterlines
22. (204) The category of –21 equipment used for life support and crew comfort is III.
23. (204) The effective range of a fully charged handheld fire extinguisher is 20 feet.
24. (205) The first practical laminated composite formed was plywood
25. (206) A barometer is designed to measure pressure in inches of mercury.
26. (206) Atmospheric pressure at sea level is 14.7 pounds per square inch (psi).
27. (206) The force that acts parallel to the relative wind is drag
28. (207) The axis that extends lengthwise through the fuselage from the nose to the tail is the longitudinal.
29. (207) The axis that extends crosswise from wing tip to wing tip is the lateral.
30. (207) Movement about the vertical axis is called yaw.
31. (207) The flight control located on the longitudinal control surface is the elevator.
32. (207) The type of flight control system that allows the pilot to control the aircraft if hydraulic pressure is lost is manual
33. (207) When making a right turn, the relative position of the ailerons is the right aileron up, left aileron down.
34. (207) The flight control surfaces used to make an aircraft climb or dive are elevators.
35. (207) The type of flap normally incorporated on bomber and cargo type aircraft is fowler.
36. (207) Aircraft have trim systems to correct minor deviations in flight attitude.
37. (208) The law that states, “the distortion of any elastic body is proportional to the distorting force” is known as Hook’s Law.
38. (208) When any force causes a solid to change permanently, the solid is said to have passed the elastic limit.
39. (208) The most outstanding characteristic of a liquid is its ability to conform to the shape of its container.
40. (208) Pascal’s Law applies to confined fluids at rest.
41. (208) Among the first to study the compressibility of gases was Boyle.
42. (208) The person who found that all gases expand and contract in direct proportion to the change in temperature, provided the pressure remains constant, was Charles.
43. (209) If 50 pounds per square inch (psi) of cylinder pressure acts on a 5-square-inch piston head, the resulting force will be 250 pounds.
44. (209) When an 8-square-inch piston moves 5 inches within a cylinder, the volume of liquid displaced will be 40 cubic inches.
45. (209) The principle, which states that as the velocity of a gas or liquid increases, pressure decreases, is Bernoulli’s.
46. (209) As fluid enters the narrow portion of a venturi, it accelerates.
47. (210) When referring to hydraulic hand pumps, double-action means fluid-flow is created with each stroke of the pump handle.
48. (210) Variable-volume pumps do not require a separate pressure-regulating device in the system because they have an integral compensator.
49. (210) Cooler operation in a variable-volume hydraulic pump is provided by creep plates.
50. (210) In the Stratopower variable-volume pump, the pistons are held in contact with the cam plate by the nutating plate.
51. (211) An accumulator’s piston is installed with the hollow end toward the air side of the accumulator.
52. (211) The size of one micron is four millionths of an inch.
53. (211) If a filter is rated at 10 microns nominal, it may allow some particles 10 microns or larger to get through.
54. (211) Hydraulic manifolds are used in a hydraulic system to provide a location where the common fluid lines can come together.
55. (212) The pneudraulic system component that uses a single-acting actuating cylinder is the brake assembly
56. (212) What pneudraulic system component uses a double-acting balanced actuating cylinder? nosewheel steering
57. (212) Some aircraft manufactures use the term “power control cylinders” when referring to tandem actuators
58. (212) The pressure at which the relief valve ball is slightly unseated is called the cracking pressure
59. (212) The major advantage of the manual slide-type hydraulic selector valve is its metering ability
60. (212) The difference between a selector valve and a servo valve is the servo valve will control fluid-flow
61. (212) The purpose of a hydraulic system check valve is to allow flow in only one direction
62. (212) Another name for a flapper check valve is gate check valve
63. (212) Allowing normal operating speed of a hydraulic actuator in one direction while limiting speed in the other direction is done by the restrictor check valve
64. (213) The four major sections of a basic hydraulic system are supply, pressure, return, and auxiliary
65. (213) The basic units of a hydraulic hand pump system are the reservoir, pump, actuator and manual shutoff valve
66. (213) The reservoir supplies hydraulic fluid to a hand pump by gravity and the suction effect of the pump
67. (213) A relief valve is installed in a variable-volume hydraulic pump to relieve pressure if the pump compensator fails
68. (213) In most hydraulic subsystems, the actuating units are connected in parallel
69. (214) The shock strut component that controls the rate of fluid-flow through the orifice is the metering pin
70. (214) The purpose of the torsion links on a main landing gear is to prevent the inner cylinder from rotating within the outer cylinder
71. (214) The motion of the landing gear control lever is transmitted to the selector valve by a cable system
72. (214) Landing gear safety switches are actuated by torsion links
73. (214) The two most common types of shimmy dampers used in nose wheel steering are the piston and vane
74. (215) The purpose of aircraft brakes is to retard motion using friction
75. (215) The purpose of deboosters is to reduce braking pressure
76. (215) The two types of emergency brake systems are hydraulic and pneumatic
77. (215) The purpose of the antiskid system is to prevent wheel skid by releasing pressure from the skidding wheel
78. (216) Split wheels are balanced individually by halves
79. (216) An airtight seal is maintained between split wheel halves by use of an O-ring seal
80. (216) The type of bearings used on aircraft wheels is tapered roller
81. (216) The bearing cone of an aircraft wheel bearing is also called the inner race
82. (216) The kinds of pitting that affect bearings are corrosive and mechanical
83. (216) The two types of brinelling are true and false
84. (217) An aircraft tire’s maximum recommended static load is called the ply rating
85. (217) The term “ply rating” refers to the index of tire casting strengths
86. (217) For tires 24 inches or greater outside diameter, the tire shall be removed when wear reaches the bottom of any tread groove for a continuous length of 12 inches
87. (218) Matter is any substance that has mass and occupies space
88. (218) Atoms are made up of protons, neutrons and electrons
89. (218) Electrons can be released from their outer orbit by all of the following forces except cold
90. (219) The greater the current flow through an electromagnet, the greater the strength
91. (219) To determine the direction a current-carrying conductor will move in a magnetic field, you should use the left-hand rule for conductors
92. (220) Current that periodically reverses is called alternating
93. (220) The term used to express a condition in which two moving objects are changing in or out of step is phase
94. (220) The methods used to cool brushless alternating current (AC) generators are engine oil and blast air
95. (220) The underspeed switch (USS) on the 60/80 kilovolt ampere (KVA) generator constant speed drive (CSD) actuates at 365 Hz.
96. (221) The internal component of a battery that is a grid or framework, which supports the active chemical materials, is the plate.
97. (221) A 24-volt nickel-cadmium battery has 19 cells
98. (221) The nickel-cadmium battery electrolyte will appear to be low when the cells are partially discharge
99. (221) The component designed to convert 115/220-volt alternating current (AC) power into 28-volts (or less) direct current (DC) to operate the aircraft DC system is the transformer-rectifier (T-R).
100. (222) When measuring resistance on a multimeter, the letters OL indicate infinity.
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