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