Aircraft Systems, Part 1 Trivia Questions

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  • 1/100 Questions

    The three states of matter are

    • Liquids, gases, and minerals.
    • Gases, solids, and minerals
    • Gases, solids, and organic.
    • Liquids, gases, and solids.
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About This Quiz

Explore the fundamentals of aircraft systems with this trivia, focusing on atmospheric pressure, forces affecting airfoils, and material stresses. This quiz is designed to assess and enhance your understanding of key aerospace concepts, crucial for professionals in the field.

Aircraft Systems Quizzes & Trivia

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  • 2. 

    The purpose of aircraft trim systems is to

    • Reduce the amout of lift.

    • Prevent the aircraft from stalling.

    • Correct minor deviations in flight attitude.

    • Improve augmented lateral control surface movement.

    Correct Answer
    A. Correct minor deviations in flight attitude.
    Explanation
    Aircraft trim systems are designed to adjust the aircraft's control surfaces in order to maintain a desired flight attitude. These systems help to correct any minor deviations in the aircraft's pitch, roll, or yaw, ensuring that the aircraft stays in a stable and controlled state of flight. By making these adjustments, the trim systems help pilots to maintain a balanced and efficient flight, without the need for constant manual control inputs.

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  • 3. 

    Matter is any substance that has mass and

    • Can be seen.

    • Occupies space.

    • Has constant volume.

    • Cannot be compressed.

    Correct Answer
    A. Occupies space.
    Explanation
    The correct answer is "occupies space" because matter refers to anything that takes up space and has mass. This means that matter has a physical presence and can be measured in terms of volume. Therefore, the statement "occupies space" accurately describes one of the fundamental characteristics of matter.

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  • 4. 

    Atoms are made up of

    • Molecules, protons, neutrons.

    • Protons, molecules, electrons.

    • Molecules neutrons, electrons.

    • Protons, neutrons and electrons.

    Correct Answer
    A. Protons, neutrons and electrons.
    Explanation
    Atoms are the basic building blocks of matter, and they are composed of three main subatomic particles: protons, neutrons, and electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. These particles are held together in the nucleus of an atom, with protons and neutrons making up the nucleus and electrons orbiting around it. Therefore, the correct answer is that atoms are made up of protons, neutrons, and electrons.

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  • 5. 

    What is the purpose of the arrow on a check valve?

    • Show filter position within the system

    • Indicate left-and right-hand threading,

    • Show the direction of free flow through the valve.

    • Indicate installation points in relation to the pump.

    Correct Answer
    A. Show the direction of free flow through the valve.
    Explanation
    The purpose of the arrow on a check valve is to show the direction of free flow through the valve. This arrow indicates the direction in which the fluid or gas can flow through the valve, allowing for proper installation and operation of the check valve.

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  • 6. 

    The most outstanding characteristic of a liquid is its

    • Rigidity.

    • Usability.

    • Ability to compress within its container.

    • Ability to conform to the shape of its container.

    Correct Answer
    A. Ability to conform to the shape of its container.
    Explanation
    The correct answer is the ability to conform to the shape of its container. Unlike solids, liquids do not have a fixed shape and can take the shape of the container they are placed in. This is due to the weak intermolecular forces between liquid particles, allowing them to flow and move freely. Liquids are not rigid, as they can be poured or transferred from one container to another. They also cannot be compressed within their container, as their particles are already close together.

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  • 7. 

    The purpose of the landing gear warning horn is to

    • Alert the pilot to marker beacons.

    • Sound when gear is not safe.

    • Sound when gear is safe.

    • Alert the pilot to a stall.

    Correct Answer
    A. Sound when gear is not safe.
    Explanation
    The landing gear warning horn is designed to sound when the gear is not safe. This means that if the landing gear is not properly extended or locked in place, the warning horn will alert the pilot to the potential danger. It serves as a crucial safety feature, ensuring that the pilot is aware of any issues with the landing gear before landing or taking off.

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  • 8. 

    If 50 pounds per square inch (PSI) of cylinder pressure acts on a 5-square-inch piston head, what will the resulting force be?

    • 150 pounds.

    • 200 pounds.

    • 250 pounds.

    • 300 pounds.

    Correct Answer
    A. 250 pounds.
    Explanation
    The resulting force can be calculated by multiplying the cylinder pressure (50 PSI) by the piston head area (5 square inches). This gives us a force of 250 pounds.

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  • 9. 

    When cleaning aircraft wheels, you should not use

    • A fiber brush.

    • A wire brush.

    • Clean rags.

    • Fiber pads.

    Correct Answer
    A. A wire brush.
    Explanation
    Using a wire brush to clean aircraft wheels can cause damage to the surface of the wheels. Wire bristles can be too abrasive and may scratch or scrape the wheels, potentially leading to corrosion or other issues. It is important to use non-abrasive materials, such as fiber brushes, clean rags, or fiber pads, to safely and effectively clean aircraft wheels without causing any damage.

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  • 10. 

    What term describes current that reverses its direction at regularly recurring intervals?

    • Direct.

    • Inductive.

    • Reversing.

    • Alternating

    Correct Answer
    A. Alternating
    Explanation
    The term that describes current that reverses its direction at regularly recurring intervals is "alternating." This type of current is commonly used in electrical power systems, where the flow of electricity changes direction periodically. Unlike direct current, which flows in only one direction, alternating current alternates between positive and negative directions, allowing for efficient transmission of electricity over long distances.

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  • 11. 

    A mojor disadvantage of multiple disc brakes is that they

    • Warp when overheated.

    • Shatter during hard landings.

    • Must be adjusted after each landing.

    • Do not provide maximum stopping grip.

    Correct Answer
    A. Warp when overheated.
    Explanation
    Multiple disc brakes have a major disadvantage of warping when overheated. This means that when the brakes get too hot, they can become distorted and lose their shape, causing them to be less effective in stopping the vehicle. This can lead to decreased braking performance and potentially unsafe driving conditions.

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  • 12. 

    The force that acts upward at a right angle to the direction of the relative wind is

    • Lift.

    • Drag.

    • Thrust.

    • Weight.

    Correct Answer
    A. Lift.
    Explanation
    The force that acts upward at a right angle to the direction of the relative wind is called lift. Lift is the force that allows an object, such as an airplane, to overcome gravity and stay in the air. It is generated by the shape of the object's wings or airfoils and the flow of air over them. This upward force counters the weight of the object, allowing it to stay aloft.

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  • 13. 

    If you apply 24 volts through a total resistance of 6 ohms is a series circut, the amperage would be

    • 2.

    • 4.

    • 6.

    • 18.

    Correct Answer
    A. 4.
    Explanation
    When 24 volts are applied to a total resistance of 6 ohms in a series circuit, the amperage can be calculated using Ohm's Law, which states that current (amperage) is equal to voltage divided by resistance. In this case, the current can be calculated as 24 volts divided by 6 ohms, which equals 4 amperes.

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  • 14. 

    When a 8-square-inch piston moves 5 inches within a cylinder, what volume of liquid is displaced?

    • 4 cubic inches.

    • 40 cubic inches.

    • 400 cubis inches.

    • 4,000 cubic inches.

    Correct Answer
    A. 40 cubic inches.
    Explanation
    The volume of liquid displaced can be calculated by multiplying the area of the piston (8 square inches) by the distance it moves (5 inches). This gives us a volume of 40 cubic inches.

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  • 15. 

    What is the design that uses any combination of longerons, stringers, bulkheads, and frames in the construction of the fuselage called?

    • Fuselage.

    • Longerons.

    • Monocoque.

    • Semi-monocoque.

    Correct Answer
    A. Semi-monocoque.
    Explanation
    A semi-monocoque design is a type of fuselage construction that combines longerons, stringers, bulkheads, and frames. In this design, the skin of the fuselage carries a significant portion of the structural load, while the internal framework provides additional support and strength. This design is commonly used in modern aircraft as it offers a good balance between strength and weight.

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  • 16. 

    What is the electrical pressure that causes electrons to flow through the conductor called?

    • Chemical swap.

    • Crossfeed field.

    • Electromotive force.

    • Tranferring magnetic field.

    Correct Answer
    A. Electromotive force.
    Explanation
    Electromotive force is the correct answer because it refers to the electrical pressure that causes electrons to flow through a conductor. It is the driving force that pushes the electrons in a circuit, enabling the flow of electrical current. The other options, such as chemical swap, crossfeed field, and transferring magnetic field, do not accurately describe the electrical pressure that causes electron flow.

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  • 17. 

    What usually produces flow in a pneudraulic system?

    • Relief valve in the lines.

    • Piston pushing the fluid.

    • Scrupper pushing the fluid.

    • Selector valve in the lines.

    Correct Answer
    A. Piston pushing the fluid.
    Explanation
    In a pneudraulic system, flow is typically produced by the piston pushing the fluid. The piston creates pressure within the system, which then forces the fluid to flow through the system. This flow is essential for the proper functioning of the pneudraulic system, as it allows for the transfer of power and the operation of various components. The relief valve, scrupper, and selector valve may play important roles in controlling the flow or regulating the pressure, but they do not directly produce the flow in the system.

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  • 18. 

    Who was among the first to study the compressibility of gases?

    • Hook.

    • Boyle.

    • Pascal.

    • Charles.

    Correct Answer
    A. Boyle.
    Explanation
    Boyle was among the first to study the compressibility of gases. His work in the 17th century led to Boyle's Law, which states that the volume of a gas is inversely proportional to its pressure, when temperature is held constant. Boyle conducted experiments using a J-shaped tube filled with mercury and observed the relationship between the volume and pressure of gases. His contributions laid the foundation for the understanding of gas behavior and the development of the field of thermodynamics.

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  • 19. 

    The most common type of material used for fuselage construction is

    • Steel.

    • Titanium.

    • Magnesium.

    • Aluminum alloy.

    Correct Answer
    A. Aluminum alloy.
    Explanation
    The most common type of material used for fuselage construction is aluminum alloy. This is because aluminum alloys offer a good balance of strength and weight, making them ideal for aircraft structures. They have high strength-to-weight ratio, corrosion resistance, and can withstand the stresses and pressures experienced during flight. Additionally, aluminum alloys are relatively easy to work with and can be formed into complex shapes, making them suitable for the curved and streamlined design of fuselages. Steel, titanium, and magnesium are also used in aircraft construction, but aluminum alloy is the most commonly used material for fuselages.

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  • 20. 

    The majority of the aircraft circuit protection devices are normally located

    • In the aircraft cabin.

    • In the nose wheel well.

    • In the utility compartments.

    • As far as possible from the unit being pretected.

    Correct Answer
    A. In the aircraft cabin.
    Explanation
    The correct answer is in the aircraft cabin. This is because the aircraft cabin is the central location where the majority of the aircraft's electrical systems and components are housed. Placing the circuit protection devices in the cabin allows for easy access and maintenance. Additionally, locating them in the cabin ensures that they are protected from external elements and potential damage.

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  • 21. 

    A ture whose cross-section area is gradually reduced to smaller size diameter is called a

    • Torus.

    • Pipette.

    • Vortex.

    • Venturi.

    Correct Answer
    A. Venturi.
    Explanation
    A venturi is a tube with a gradually decreasing cross-sectional area, which results in an increase in fluid velocity. This phenomenon is known as the venturi effect. The reduction in diameter creates a pressure difference between the wider and narrower sections of the tube. This principle is utilized in various applications such as fluid flow measurement and creating suction in devices like vacuum cleaners. A torus is a doughnut-shaped object, a pipette is a laboratory tool used for transferring small amounts of liquid, and a vortex refers to the swirling motion of fluids.

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  • 22. 

    What type of motor can operate on alternating current (AC) or direct current (DC)?

    • Shunt.

    • Circuit.

    • Universal.

    • Compound.

    Correct Answer
    A. Universal.
    Explanation
    A universal motor is able to operate on both alternating current (AC) and direct current (DC). This type of motor is designed with a special configuration that allows it to work efficiently with either type of current. It is commonly used in household appliances, power tools, and other applications where flexibility in power supply is required. The other options, such as shunt, circuit, and compound motors, are not capable of operating on both AC and DC.

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  • 23. 

    The purpose of the antiskid system is to

    • Reduce friction between the wheel and tire.

    • Increase friction between the wheel and tire.

    • Prevent wheel skid by applying pressure to the skidding wheel.

    • Prevent wheel skid by releasing pressure from the skidding wheel.

    Correct Answer
    A. Prevent wheel skid by releasing pressure from the skidding wheel.
    Explanation
    The antiskid system is designed to prevent wheel skid by releasing pressure from the skidding wheel. When a wheel begins to skid, the antiskid system detects this and reduces the pressure on that wheel, allowing it to regain traction and prevent further skidding. By releasing pressure, the system helps to maintain control and stability of the vehicle, reducing the risk of accidents. Increasing friction between the wheel and tire would actually contribute to skidding, so it is not the purpose of the antiskid system.

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  • 24. 

    Atmospheric pressure at sea level is

    • 14.7 pounds per square inch (psi)

    • 17.4 psi

    • 29.92 psi

    • 29.29 psi

    Correct Answer
    A. 14.7 pounds per square inch (psi)
    Explanation
    Atmospheric pressure at sea level is commonly measured as 14.7 pounds per square inch (psi). This value represents the average pressure exerted by the Earth's atmosphere at sea level. It is important to note that atmospheric pressure can vary slightly depending on factors such as weather conditions and altitude. However, 14.7 psi is considered the standard value used for reference in various scientific and engineering applications.

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  • 25. 

    A barometer is designed to measure pressure in

    • Pounds per square inch (psi)

    • Inches of mercury

    • Milibars of alcohol

    • Ounces of air

    Correct Answer
    A. Inches of mercury
    Explanation
    A barometer is a device used to measure atmospheric pressure. The most common unit for measuring pressure using a barometer is inches of mercury (inHg). This unit is derived from the height of a column of mercury that is supported by the atmospheric pressure. As the pressure changes, the height of the mercury column also changes, allowing for the measurement of pressure in inches of mercury. This unit is widely used in meteorology and aviation.

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  • 26. 

    Electrons can be released from their outer orbit by all of the following forces except

    • Heat.

    • Cold.

    • Chemical action.

    • Changing magnetic field.

    Correct Answer
    A. Cold.
    Explanation
    Electrons can be released from their outer orbit by various forces such as heat, chemical action, and changing magnetic fields. However, cold temperatures do not have enough energy to overcome the binding forces holding electrons in their orbits. Therefore, cold is the only force mentioned that cannot release electrons from their outer orbit.

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  • 27. 

    Current flow in the most aircraft circuits is controlled by

    • Fuses.

    • Signals.

    • Batteries.

    • Switches.

    Correct Answer
    A. Switches.
    Explanation
    In aircraft circuits, the current flow is controlled by switches. Switches are used to open or close the circuit, allowing or stopping the flow of electric current. They act as control devices that enable the pilot or operator to activate or deactivate various electrical components or systems in the aircraft. Fuses protect the circuit from excessive current, batteries provide the power source, and signals are used for communication or indicating purposes. However, neither fuses, batteries, nor signals directly control the current flow in aircraft circuits.

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  • 28. 

    The nickel-cadmium battery can be fully charged only by

    • Pulsating current.

    • Constant current.

    • Varying curent.

    • Eddy current.

    Correct Answer
    A. Constant current.
    Explanation
    The nickel-cadmium battery can be fully charged only by a constant current. This is because a constant current ensures a steady flow of electrons into the battery, allowing for a controlled and efficient charging process. Pulsating current, varying current, and eddy current would not provide a consistent and stable flow of electrons, which could result in incomplete or inefficient charging of the battery.

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  • 29. 

    The main difference between inspection plates and panels is

    • Size.

    • Material.

    • Location.

    • Installation.

    Correct Answer
    A. Size.
    Explanation
    The main difference between inspection plates and panels is their size. Inspection plates are typically smaller in size and are used for accessing specific areas or components for inspection or maintenance purposes. On the other hand, panels are larger and are used to cover larger areas or enclosures. The size difference allows for easier access and maintenance of different parts or systems in a given structure or equipment.

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  • 30. 

    A network of ultra cracks that form on or under the surfave of transparent pastics is called

    • Crazing.

    • Casting.

    • Fretting.

    • Pitting.

    Correct Answer
    A. Crazing.
    Explanation
    Crazing refers to the formation of a network of fine cracks on or under the surface of transparent plastics. This phenomenon typically occurs due to the stress or strain applied to the material, causing it to develop small fractures that resemble a spider web pattern. Casting, fretting, and pitting are unrelated terms and do not describe the specific cracking behavior observed in crazing.

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  • 31. 

    What are the reference locations in the vertical direction measured from a reference datum that is usually well below the aircraft called?

    • Buttlines.

    • Waterlines.

    • Buttock stations.

    • Fuselage stations.

    Correct Answer
    A. Waterlines.
    Explanation
    The reference locations in the vertical direction measured from a reference datum that is usually well below the aircraft are called waterlines. Waterlines are horizontal reference lines that are used to determine the position of various components of an aircraft, such as the wings, fuselage, and tail, in relation to the waterline. These reference locations help in ensuring proper balance and stability of the aircraft during flight and are crucial for design, maintenance, and performance purposes.

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  • 32. 

    Movement about the vertical axis is called

    • Roll.

    • Yaw.

    • Crab.

    • Pitch.

    Correct Answer
    A. Yaw.
    Explanation
    Movement about the vertical axis is called "yaw." Yaw refers to the rotation of an object or body around its vertical axis, which is an imaginary line passing through the center of gravity and extending vertically from the object. This movement causes the object to turn left or right, similar to the motion of a ship or an airplane changing its direction horizontally. Roll refers to the rotation around the longitudinal axis, pitch refers to the rotation around the lateral axis, and crab refers to a sideways movement caused by crosswinds.

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  • 33. 

    When soft iron is brought close to a permanent magnet it is

    • Charged.

    • Repelled.

    • Energized.

    • Magnetized.

    Correct Answer
    A. Magnetized.
    Explanation
    When soft iron is brought close to a permanent magnet, it becomes magnetized. Soft iron is a ferromagnetic material, which means it can be easily magnetized and demagnetized. When it is brought close to a permanent magnet, the magnetic field of the permanent magnet induces a magnetic field in the soft iron, aligning its domains and making it temporarily magnetic. This magnetization disappears when the soft iron is no longer in the presence of the permanent magnet. Therefore, the correct answer is magnetized.

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  • 34. 

    The greater the current flow through an electromagnet, the

    • Less the strength.

    • Greater the strength.

    • Greater the retentivity.

    • Higher the reluctance of the core.

    Correct Answer
    A. Greater the strength.
    Explanation
    The strength of an electromagnet is directly proportional to the current flow through it. As the current increases, the magnetic field produced by the electromagnet becomes stronger. This is because the magnetic field is created by the alignment of the magnetic domains within the core material, and a higher current flow leads to a greater alignment of these domains, resulting in a stronger magnetic field. Therefore, the greater the current flow through an electromagnet, the greater its strength.

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  • 35. 

    What supplies rotary power to the input gear of the constant speed drive (CSD)?

    • Accessory gearbox.

    • Transmission shaft.

    • Torque converter.

    • Hydraulic gear.

    Correct Answer
    A. Accessory gearbox.
    Explanation
    The accessory gearbox supplies rotary power to the input gear of the constant speed drive (CSD). This means that the accessory gearbox is responsible for providing the necessary power to the CSD, allowing it to function properly. The other options, such as the transmission shaft, torque converter, and hydraulic gear, are not directly involved in supplying power to the CSD.

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  • 36. 

    The purpose of a hydraulic motor is to convert hydraulic pressure into

    • Rotary mechanical motion.

    • Kinetic flow motion.

    • Straight-line motion.

    • Fluid locomotion.

    Correct Answer
    A. Rotary mechanical motion.
    Explanation
    A hydraulic motor is designed to utilize hydraulic pressure to generate rotary mechanical motion. It is commonly used in various applications such as construction equipment, manufacturing machinery, and vehicles. By harnessing the power of hydraulic fluid, the motor can convert the pressure into rotational force, allowing it to drive different types of machinery and perform tasks such as rotating a shaft or powering a hydraulic pump. This enables the hydraulic system to efficiently transmit power and control the movement of various mechanical components.

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  • 37. 

    What maintains an airtight seal between split wheel halves?

    • A rubber liner.

    • An O-ring seal.

    • A phenolic ring.

    • Machined mated surfaces.

    Correct Answer
    A. An O-ring seal.
    Explanation
    An O-ring seal is used to maintain an airtight seal between split wheel halves. O-rings are made of rubber or other elastomer materials and are designed to fit into a groove between two mating surfaces. When compressed, the O-ring creates a tight seal, preventing any air or fluid from leaking between the split wheel halves. This type of seal is commonly used in various applications where a reliable and leak-proof connection is required.

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  • 38. 

    Installed bearing races should be free of scratches, dents, and

    • Dye marks.

    • Paint marks.

    • Blister marks.

    • Overheating marks.

    Correct Answer
    A. Overheating marks.
    Explanation
    Installed bearing races should be free of scratches, dents, dye marks, and paint marks as these can indicate damage or contamination. However, overheating marks are particularly important to avoid as they can indicate excessive heat and potential damage to the bearing race. Overheating can lead to premature wear and failure of the bearing, so it is crucial to ensure that there are no signs of overheating marks on the installed bearing races.

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  • 39. 

    For tires 24 inches or greater outside diameter, the tire must be removed when wear reaches the bottom of any tread groove of any tread groove for a continuous length of

    • 4 inches.

    • 6 inches.

    • 12 inches.

    • 16 inches.

    Correct Answer
    A. 12 inches.
    Explanation
    When the wear on a tire reaches the bottom of any tread groove for a continuous length of 12 inches, the tire must be removed. This means that if there is a section of the tire where the tread is worn down to the bottom of the groove for a distance of 12 inches or more, it is no longer safe to use the tire and it should be replaced.

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  • 40. 

    The stress that resists the force tending to cause one layer of material to slide over an adjacent layer is called

    • Bending.

    • Tension.

    • Torsion.

    • Shear.

    Correct Answer
    A. Shear.
    Explanation
    Shear stress refers to the stress that resists the force that tries to cause one layer of material to slide over an adjacent layer. It occurs parallel to the plane of contact between the layers and acts in opposite directions on each layer. Bending stress is related to the deformation of a material due to bending, tension stress is caused by the pulling force applied to a material, and torsion stress is the stress caused by twisting or rotating forces. However, shear stress specifically addresses the resistance to sliding between layers, making it the correct answer in this case.

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  • 41. 

    The structural members used to give shape to the aircraft and provide a means for attaching the skin to the structure are called

    • Longerons.

    • Bulkheads.

    • Stringers.

    • Frames.

    Correct Answer
    A. Stringers.
    Explanation
    Stringers are structural members that are used to give shape to the aircraft and provide a means for attaching the skin to the structure. They are long, thin strips of material that run longitudinally along the fuselage or wing. Stringers help to distribute the loads and stresses evenly throughout the structure, providing strength and rigidity. They also help to maintain the shape of the aircraft and prevent deformation. Therefore, stringers are the correct answer in this case.

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  • 42. 

    When any force causes a solid to change permanently, the solid is said to have

    • Passed the elastic limit.

    • Lost the ability to expand.

    • Failed to meet elastic limit.

    • Passed the compression limit.

    Correct Answer
    A. Passed the elastic limit.
    Explanation
    When a solid is subjected to a force that causes it to change permanently, it means that the solid has exceeded its elastic limit. The elastic limit is the maximum stress or force that a material can withstand without undergoing permanent deformation. Once the elastic limit is surpassed, the solid loses its ability to return to its original shape and size after the force is removed. Therefore, the correct answer is that the solid has passed the elastic limit.

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  • 43. 

    What position must the landing gear control handle be in before emergency extension of the landing gear?

    • UP.

    • DN.

    • AUX.

    • EMERG.

    Correct Answer
    A. DN.
    Explanation
    Before emergency extension of the landing gear, the landing gear control handle must be in the DN (Down) position. This allows for the emergency extension process to be initiated, causing the landing gear to be lowered manually. The UP position is for normal retraction of the landing gear, AUX is for auxiliary operations, and EMERG is for emergency operations after the gear has been manually extended.

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  • 44. 

    Engine mounts are typically made of corrosion-resistant steel that is able to withstand forces of

    • 120,000 to 140,000 pounds per square inch (psi).

    • 150,000 to 170,000 psi.

    • 180,000 to 200,000 psi.

    • 210,000 to 230,000 psi.

    Correct Answer
    A. 180,000 to 200,000 psi.
    Explanation
    Engine mounts are typically made of corrosion-resistant steel that is able to withstand forces of 180,000 to 200,000 pounds per square inch (psi). This range of psi ensures that the engine mounts can endure the high levels of stress and pressure generated by the engine during operation.

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  • 45. 

    The advantages of an electricity controlled solenoid valve is its

    • Reduced weight.

    • Increased weight.

    • Ability to reduce turbulence.

    • Ability to increase turbulence.

    Correct Answer
    A. Reduced weight.
    Explanation
    The correct answer is reduced weight. An electricity controlled solenoid valve is advantageous because it has a reduced weight compared to other types of valves. This reduced weight makes it easier to install and transport, and also reduces the strain on the system where it is being used. Additionally, the reduced weight allows for more flexibility in design and placement, making it a preferred choice in many applications.

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  • 46. 

    Which of these allows normal operating speed of hydraulic actuator in one direction while limiting speed in the other direction?

    • Automatic check valve.

    • Restricter check valve.

    • Bypass valve.

    • Relief valve.

    Correct Answer
    A. Restricter check valve.
    Explanation
    A restrictor check valve is designed to allow the normal operating speed of a hydraulic actuator in one direction while limiting the speed in the other direction. This valve contains a check valve that allows flow in one direction and a restrictor that limits the flow rate in the opposite direction. This setup ensures that the actuator can move quickly in the desired direction while controlling the speed and preventing excessive movement in the opposite direction.

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  • 47. 

    Wich of these is attached to the trailing edge of a horizontal stabilizer?

    • Flap.

    • Spoiler.

    • Rudder.

    • Elevator.

    Correct Answer
    A. Elevator.
    Explanation
    The elevator is attached to the trailing edge of a horizontal stabilizer. It is a movable control surface that is used to control the pitch of an aircraft. By changing the angle of the elevator, the pilot can control the aircraft's nose-up or nose-down attitude, allowing for changes in altitude. Flaps are attached to the wings and are used to increase lift during takeoff and landing. Spoilers are also attached to the wings and are used to decrease lift and increase drag. The rudder is attached to the vertical stabilizer and is used to control the yaw of the aircraft.

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  • 48. 

    The purpose of a hydraulic reservoir are to

    • Store fluid and act as a surge chamber.

    • Restrict fluid-flow in selected directions.

    • Pressurize and direct fluid to an actuator.

    • Replenish fluid, allow for thermal expansion, and provide a means of bleeding air from the system.

    Correct Answer
    A. Replenish fluid, allow for thermal expansion, and provide a means of bleeding air from the system.
    Explanation
    The purpose of a hydraulic reservoir is to replenish fluid, allow for thermal expansion, and provide a means of bleeding air from the system. Replenishing fluid is important to ensure that the hydraulic system always has an adequate amount of fluid to operate effectively. Allowing for thermal expansion is necessary because as the fluid heats up during operation, it expands and needs space to accommodate this expansion. Lastly, providing a means of bleeding air from the system is crucial as air in the hydraulic system can cause inefficiencies and potential damage.

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  • 49. 

    The size of one micron is four

    • Tenths of an inch.

    • Thousandths of a inch.

    • Millionths of a inch.

    • Billionths of a inch.

    Correct Answer
    A. Millionths of a inch.
    Explanation
    One micron is a unit of length equal to one millionth of a meter. Since there are 39.37 inches in a meter, one millionth of a meter is equivalent to one millionth of 39.37 inches, which is approximately 0.00003937 inches. Therefore, the size of one micron is millionths of an inch.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 12, 2014
    Quiz Created by
    Mariscal
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