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