CDC Volume 2 UREs 2AX5X
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The three states of matter are
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Liquids, solids, and gases
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Liquids, gases, and minerals
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Gases, solids, and minerals
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Gases, solids, and organic
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This CDC Volume 2 UREs 2AX5X quiz evaluates knowledge essential for understanding flight mechanics, focusing on atmospheric pressure, airfoil dynamics, and forces affecting aircraft. It's designed for aerospace professionals and students aiming to deepen their understanding of core flight principles.
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- 2.
The most outstanding characteristic of a liquid is its
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Rigidity
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Usability
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Ability to compress within its container
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Ability to conform to the shape of its container
Correct Answer
A. Ability to conform to the shape of its containerExplanation
The correct answer is "ability to conform to the shape of its container." Liquids have the unique property of being able to take the shape of their container, unlike solids which have a fixed shape. This is because the particles in a liquid are free to move and flow, allowing them to fill the container evenly. Liquids are not rigid like solids, and they cannot be compressed like gases. Therefore, the most outstanding characteristic of a liquid is its ability to conform to the shape of its container.Rate this question:
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- 3.
What is the purpose of the arrow on a check valve?
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Show filter position within the system
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Indicate left- and right-hand threading
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Show the direction of free flow through the valve
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Indicate installation points in relation with the pump
Correct Answer
A. Show the direction of free flow through the valveExplanation
The purpose of the arrow on a check valve is to show the direction of free flow through the valve. This is important because check valves are designed to allow flow in one direction only and prevent backflow. The arrow indicates the correct orientation of the valve to ensure that flow is moving in the intended direction.Rate this question:
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- 4.
When cleaning aircraft wheels, you should not use
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A fiber brush
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A wire brush
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Clean rags
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Fiber pads
Correct Answer
A. A wire brushExplanation
Using a wire brush to clean aircraft wheels can cause damage to the surface of the wheels. Wire brushes have hard bristles that can scratch or scrape the wheels, leading to potential structural integrity issues. It is important to use softer materials like fiber brushes, clean rags, or fiber pads to avoid any damage while effectively cleaning the wheels.Rate this question:
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- 5.
The force that acts upward at a right angle to the direction of the relative wind is
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Lift
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Drag
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Thrust
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Weight
Correct Answer
A. LiftExplanation
Lift is the force that acts upward at a right angle to the direction of the relative wind. It is the force that allows an object, such as an airplane, to stay in the air and counteracts the force of gravity. Lift is generated by the interaction between the shape of the object, such as the wings of an airplane, and the flow of air around it.Rate this question:
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- 6.
The purpose of aircraft trim system is to
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Reduce the amount of lift
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Prevent the aircraft from stalling
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Correct minor deviations in flight attitude
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Improve augmented lateral control surface movement
Correct Answer
A. Correct minor deviations in flight attitudeExplanation
The purpose of the aircraft trim system is to correct minor deviations in flight attitude. This system helps in maintaining the desired pitch, roll, and yaw of the aircraft during flight. It allows pilots to adjust the control surfaces to counterbalance any imbalances caused by factors like weight distribution, fuel consumption, or changes in the center of gravity. By making these minor adjustments, the trim system ensures that the aircraft flies smoothly and efficiently, reducing the workload on the pilot and improving overall flight stability.Rate this question:
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- 7.
Matter is any substance that has mass and
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Can be seen
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Occupies space
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Has constant volume
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Cannot be compressed
Correct Answer
A. Occupies spaceExplanation
The correct answer is "occupies space" because matter is defined as any substance that has mass and takes up space. This means that matter has volume and can be measured in terms of the space it occupies. Therefore, the statement "occupies space" accurately describes one of the essential characteristics of matter.Rate this question:
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- 8.
Atoms are made of
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Molecules, protons, neutrons
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Protons, molecules, electrons
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Molecules, neutrons, electrons
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Protons, neutrons, electrons
Correct Answer
A. Protons, neutrons, electronsExplanation
Atoms are made up of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus of an atom, while neutrons are neutrally charged particles also found in the nucleus. Electrons, on the other hand, are negatively charged particles that orbit around the nucleus. These three subatomic particles together make up the structure of an atom. Molecules, which are composed of two or more atoms, are not the fundamental building blocks of atoms. Therefore, the correct answer is protons, neutrons, electrons.Rate this question:
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- 9.
What term describes current that reverses its direction at regularly recurring intervals?
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Direct
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Inductive
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Reversing
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Alternating
Correct Answer
A. AlternatingExplanation
Alternating current (AC) is a term used to describe current that reverses its direction at regularly recurring intervals. Unlike direct current (DC), which flows in one direction, AC changes direction periodically, typically in a sinusoidal waveform. This type of current is commonly used in household electrical systems and is more efficient for long-distance power transmission.Rate this question:
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- 10.
What usually produces flow in a pneudraulic system?
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Relief valve in lines
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Piston pushing the fluid
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Scupper pushing the fluid
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Selector valve in the lines
Correct Answer
A. Piston pushing the fluidExplanation
In a pneudraulic system, flow is typically produced by the piston pushing the fluid. The piston creates pressure within the system, which then causes the fluid to flow through the lines. The other options mentioned, such as the relief valve, scupper, and selector valve, may have roles in regulating or controlling the flow of the fluid, but they do not directly produce the flow.Rate this question:
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- 11.
A barometer is designed to measure pressure in?
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Pounds per square inch
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Inches of mercury
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Milibars of alcohol
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Ounces of air
Correct Answer
A. Inches of mercuryExplanation
A barometer is designed to measure pressure in inches of mercury. This is because the most common type of barometer, called a mercury barometer, uses a column of mercury to measure atmospheric pressure. The height of the mercury column in the barometer is directly related to the atmospheric pressure, with higher pressure causing the mercury to rise and lower pressure causing it to fall. Therefore, the measurement is given in inches of mercury, indicating the height of the mercury column.Rate this question:
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- 12.
If you applied 24 volts through a total resistance of 6 ohms in a series circuit, the amperage would be?
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2
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4
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6
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18
Correct Answer
A. 4Explanation
In a series circuit, the total resistance is the sum of all resistances. Here, the total resistance is given as 6 ohms. According to Ohm's Law, the current (amperage) in a circuit is equal to the voltage divided by the resistance. Therefore, the amperage can be calculated by dividing the given voltage of 24 volts by the total resistance of 6 ohms. The result is 4 amperes, which is the correct answer.Rate this question:
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- 13.
The purpose of the landing gear warning horn is to
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Alert the pilot to marker beacons
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Sound when gear is not safe
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Sound when gear is safe
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Alert the pilot to a stall
Correct Answer
A. Sound when gear is not safeExplanation
The purpose of the landing gear warning horn is to alert the pilot when the gear is not safe. This is important because if the landing gear is not properly extended or locked in place, it can lead to a dangerous situation during landing or takeoff. The warning horn serves as an auditory signal to the pilot, indicating that there is an issue with the landing gear and prompting them to take necessary corrective actions to ensure the safety of the aircraft and its occupants.Rate this question:
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- 14.
A major disadvantage of multiple disc brakes is that they
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Warp when overheated
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Shatter during hard landings
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Must be adjusted after each landing
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Do not provide maximum stopping grip
Correct Answer
A. Warp when overheatedExplanation
Multiple disc brakes have a major disadvantage of warping when overheated. This means that excessive heat can cause the discs to deform, resulting in an uneven surface. This can lead to reduced braking performance and a less effective grip on the rotors, compromising the overall stopping power of the brakes.Rate this question:
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- 15.
Movement about the vertical axis is called
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Roll
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Yaw
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Crab
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Pitch
Correct Answer
A. YawExplanation
Yaw refers to the rotational movement about the vertical axis. It is the movement that causes an object to turn left or right. Roll refers to the rotational movement about the longitudinal axis, pitch refers to the rotational movement about the lateral axis, and crab refers to the sideways movement of an aircraft caused by the wind. Therefore, the correct answer is yaw.Rate this question:
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- 16.
Electrons can be released from their order orbit by all of the following forces except
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Heat
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Cold
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Chemical action
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Changing magnetic field
Correct Answer
A. ColdExplanation
Electrons can be released from their orbit by heat, chemical action, and changing magnetic fields. However, cold temperatures do not possess enough energy to disrupt the stability of electrons in their orbits and release them. Therefore, cold is the only force listed that cannot release electrons from their order orbit.Rate this question:
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- 17.
What is the electrical pressure that causes electrons to flow through the conductor called?
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Chemical swap
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Crossfeed field
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Electromotive force
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Transferring magnetic field
Correct Answer
A. Electromotive forceExplanation
Electromotive force is the correct answer because it refers to the electrical pressure or potential difference that causes the flow of electrons through a conductor. It is responsible for driving the current in a circuit and is typically measured in volts. The other options, chemical swap, crossfeed field, and transferring magnetic field, do not accurately describe the electrical pressure that causes electron flow.Rate this question:
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- 18.
When any force causes a solid to change permanently, the solid is said to have
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Passed its elastic limit
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Lost the ability to expand
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Failed to meet the elastic limit
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Passed the compression limit
Correct Answer
A. Passed its elastic limitExplanation
When any force causes a solid to change permanently, it means that the solid has passed its elastic limit. The elastic limit is the maximum stress or force that a solid material can withstand without undergoing permanent deformation. Once the elastic limit is exceeded, the solid will not be able to return to its original shape and size when the force is removed. Therefore, the correct answer is "passed its elastic limit".Rate this question:
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- 19.
Who was among the first to study the compressibility of gases?
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Hook
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Boyle
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Pascal
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Charles
Correct Answer
A. BoyleExplanation
Boyle was among the first to study the compressibility of gases. He formulated Boyle's law, which states that the pressure and volume of a gas are inversely proportional at a constant temperature. This groundbreaking work laid the foundation for the understanding of gas behavior and the development of the field of thermodynamics. Boyle's contributions to the study of gases were instrumental in advancing scientific knowledge in this area.Rate this question:
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- 20.
If 50 pounds per square inch of a cylinder pressure acts on a 5-square inch piston head, what will the resulting force be?
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150 pounds
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200 pounds
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250 pounds
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300 pounds
Correct Answer
A. 250 poundsExplanation
The resulting force can be calculated by multiplying the pressure (50 pounds per square inch) by the area of the piston head (5 square inches). This gives us a force of 250 pounds.Rate this question:
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- 21.
When an 8-square inch piston moves 5 inches within a cylinder, what volume of liquid is displaced?
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4 cubic inches
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40 cubic inches
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400 cubic inches
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4,000 cubic inches
Correct Answer
A. 40 cubic inchesExplanation
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.Rate this question:
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- 22.
The purpose of an actuating cylinder is to transform fluid pressure into
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Angular motion
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A mechanical force
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A constant velocity
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An electromotive force
Correct Answer
A. A mechanical forceExplanation
An actuating cylinder is a device that converts fluid pressure into a mechanical force. It uses the pressure of a fluid, typically hydraulic or pneumatic, to generate linear motion. This linear motion can then be used to produce a mechanical force, such as moving a piston or pushing a load. Therefore, the purpose of an actuating cylinder is to transform fluid pressure into a mechanical force.Rate this question:
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- 23.
The most common type of material used for fuselage construction is
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Steel
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Titanium
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Magnesium
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Aluminum alloy
Correct Answer
A. Aluminum alloyExplanation
Aluminum alloy is the most common type of material used for fuselage construction due to its favorable properties. It is lightweight, which helps reduce the overall weight of the aircraft, leading to improved fuel efficiency. Aluminum alloy also possesses high strength-to-weight ratio, making it durable and capable of withstanding the stresses and loads experienced during flight. Additionally, it is corrosion-resistant, ensuring the longevity of the fuselage. These factors make aluminum alloy a preferred choice for fuselage construction in the aviation industry.Rate this question:
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- 24.
The majority of aircraft circuit protection devise are normally located
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In the aircraft cabin
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In the nose wheel well
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In the utility compartments
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As far as possible from the unit being protected
Correct Answer
A. In the aircraft cabinExplanation
The majority of aircraft circuit protection devices are normally located in the aircraft cabin because it allows for easy accessibility and maintenance. Placing them in the cabin ensures that they can be easily monitored and repaired if necessary. Additionally, locating them in the cabin reduces the risk of damage or malfunction due to external factors such as weather conditions or physical impact.Rate this question:
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- 25.
A tube whose cross-section area is gradually reduced to a smaller size diameter is called
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Torus
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Pipette
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Vortex
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Venturi
Correct Answer
A. VenturiExplanation
A tube whose cross-section area is gradually reduced to a smaller size diameter is called a venturi. This type of tube is commonly used in fluid mechanics to measure the flow rate of fluids. The gradual reduction in diameter creates a pressure difference between the wider and narrower sections of the tube, causing the fluid to flow faster in the narrower section. This principle is utilized in various applications, such as carburetors and vacuum cleaners, where the venturi effect is used to create suction or mix air and fuel efficiently.Rate this question:
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- 26.
The size of one micron is
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Tenths of an inch
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Thousandths of an inch
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Millionths of an inch
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Billionths of an inch
Correct Answer
A. Millionths of an inchExplanation
One micron is a unit of measurement used to describe very small distances. It is equal to one millionth of an inch. This means that if you were to divide an inch into one million equal parts, each part would be one micron in size. Therefore, the correct answer is "millionths of an inch".Rate this question:
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- 27.
Which of these allows normal operating speed of a hydraulic actuator in one direction while limiting speed in the other direction?
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Automatic check valve
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Restrictor check valve
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Bypass valve
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Relief valve
Correct Answer
A. Restrictor check valveExplanation
A restrictor check valve allows normal operating speed of a hydraulic actuator in one direction while limiting speed in the other direction. This valve contains a restrictor that controls the flow of fluid, allowing it to pass freely in one direction but restricting it in the opposite direction. This restriction helps to control the speed of the actuator, preventing it from moving too quickly in the undesired direction.Rate this question:
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- 28.
What position must the landing gear control handle be in before emergency extension of the landing gear?
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UP
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DN
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AUX
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EMERG
Correct Answer
A. DNExplanation
The landing gear control handle must be in the "DN" (Down) position before emergency extension of the landing gear. This suggests that the landing gear needs to be in the retracted position before the emergency extension can be initiated.Rate this question:
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- 29.
What supplies rotary power to the input gear of the constant speed drive?
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Accessory gearbox
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Transmission shaft
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Torque converter
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Hydraulic gear
Correct Answer
A. Accessory gearboxExplanation
The accessory gearbox supplies rotary power to the input gear of the constant speed drive. It is responsible for transferring power from the engine to various accessories and components of the system. This gearbox allows for the efficient and controlled transmission of power, ensuring that the constant speed drive receives the necessary rotational force to operate effectively.Rate this question:
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- 30.
Which actuator type slows down piston travel when the piston nears either end of the cylinder?
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Tandem
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Internal locking
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Internal snubber
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Double-acting balanced
Correct Answer
A. Internal snubberExplanation
An internal snubber is an actuator type that slows down piston travel when the piston nears either end of the cylinder. It is designed to provide cushioning and absorb energy, preventing abrupt stops and reducing the impact on the piston and cylinder. This helps to prolong the lifespan of the actuator and ensures smoother operation. Tandem, internal locking, and double-acting balanced actuators do not have this specific feature, making internal snubber the correct answer.Rate this question:
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- 31.
The purpose of the antiskid system is to
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Reduce friction between the wheel and tire
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Increase friction between the wheel and tire
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Prevent wheel skid by applying pressure to the skidding wheel
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Prevent wheel skid by releasing pressure from the skidding wheel
Correct Answer
A. Prevent wheel skid by releasing pressure from the skidding wheelExplanation
The antiskid system is designed to prevent wheel skid by releasing pressure from the skidding wheel. When a wheel begins to skid, it loses traction with the road surface, which can lead to loss of control. By releasing pressure from the skidding wheel, the antiskid system allows the wheel to regain traction and maintain stability. This helps to prevent accidents and ensure safe driving conditions.Rate this question:
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- 32.
What maintains an airtight seal between spilt wheel halves?
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A rubber liner
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An O-ring seal
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A phenolic ring
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Machined mated surfaces
Correct Answer
A. An O-ring sealExplanation
An O-ring seal is used to maintain an airtight seal between split wheel halves. O-rings are made of rubber or other elastomers and are designed to fit into grooves or recesses to create a tight seal. When the wheel halves are joined together, the O-ring compresses, creating a barrier that prevents air or other fluids from leaking out. This type of seal is commonly used in various applications where a reliable and leak-proof connection is required.Rate this question:
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- 33.
Installed bearing races should be free of scratches, dents and
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Dye marks
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Paint marks
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Blister marks
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Overheating marks
Correct Answer
A. Overheating marksExplanation
Overheating marks on installed bearing races indicate that the bearing has been subjected to excessive heat, which can cause damage to the race and compromise its performance. This can result in premature wear, reduced lifespan, and potential failure of the bearing. Therefore, it is important for installed bearing races to be free of overheating marks to ensure optimal functioning and longevity of the bearing.Rate this question:
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- 34.
The main difference between inspection plates and panels is
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Size
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Material
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Location
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Installation
Correct Answer
A. SizeExplanation
Inspection plates and panels differ primarily in terms of their size. While the size of inspection plates may vary, they are typically smaller in comparison to panels. Inspection plates are generally designed to provide access to specific areas for inspection or maintenance purposes. On the other hand, panels are larger structures that serve as covers or enclosures for various components or systems. The difference in size between inspection plates and panels allows for their specific functions and applications in different contexts.Rate this question:
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- 35.
Aircraft wheels are normally constructed of
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Steel and/or titanium alloys
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Chromium and/or titanium alloys
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Palladium and/or aluminum alloys
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Magnesium and/or aluminum alloys
Correct Answer
A. Magnesium and/or aluminum alloysExplanation
Aircraft wheels are typically made of magnesium and/or aluminum alloys because these materials offer a good balance of strength, durability, and lightness. Magnesium alloys are lightweight and have good strength-to-weight ratio, making them suitable for reducing the overall weight of the aircraft. Aluminum alloys are also lightweight and have excellent corrosion resistance, making them ideal for aircraft applications. By using magnesium and/or aluminum alloys, aircraft wheels can provide the necessary strength while keeping the weight low, which is crucial for flight efficiency and fuel economy.Rate this question:
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- 36.
Engine mounts are typically made of corrosion-resistant steel that is able to withstand forces of
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120,000 to 140,000 PSI
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150,000 to 170,000 PSI
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180,000 to 200,000 PSI
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210,000 to 230,000 PSI
Correct Answer
A. 180,000 to 200,000 PSIExplanation
Engine mounts are designed to withstand the forces and vibrations generated by the engine. These forces can be quite high, and therefore, the engine mounts need to be made of a material that is strong and durable. Corrosion-resistant steel is commonly used for this purpose. The given answer range of 180,000 to 200,000 PSI indicates the tensile strength of the steel used in engine mounts. This means that the steel can withstand forces in the range of 180,000 to 200,000 pounds per square inch without breaking or deforming, making it suitable for the demanding conditions of engine mounting.Rate this question:
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- 37.
What are the reference locations in the vertical direction measured from a reference datum that is usually well below the aircraft called?
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Buttlines
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Waterlines
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Buttock stations
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Fuselage stations
Correct Answer
A. WaterlinesExplanation
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 measure the vertical position of various components of an aircraft, such as the wings, fuselage, and other structural elements. These waterlines are typically referenced to a point below the aircraft, such as the waterline on a ship or the ground level for land-based vehicles.Rate this question:
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- 38.
What provides for cooler operation in the Stratopower variable-volume hydraulic pump?
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Foot valves
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Oil radiator
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Creep plates
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Fluid radiator
Correct Answer
A. Creep platesExplanation
Creep plates provide for cooler operation in the Stratopower variable-volume hydraulic pump. These plates help to dissipate heat by increasing the surface area available for heat transfer. By allowing heat to escape more efficiently, the creep plates prevent the pump from overheating and ensure that it operates at a cooler temperature. This helps to prolong the lifespan of the pump and maintain its optimal performance.Rate this question:
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- 39.
The purpose of a hydraulic motor is to convert hydraulic pressure into
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Rotary mechanical motion
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Kinetic flow motion
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Straight-line motion
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Fluid locomotion
Correct Answer
A. Rotary mechanical motionExplanation
A hydraulic motor is designed to convert the pressure generated by hydraulic fluid into rotary mechanical motion. This means that it takes the energy from the fluid and uses it to create rotational movement, which can be used to power various types of machinery or equipment. It does not convert the pressure into kinetic flow motion, straight-line motion, or fluid locomotion.Rate this question:
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- 40.
Atmospheric pressure at sea level is?
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14.7 PSI
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17.4 PSI
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29.92 PSI
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29.29 PSI
Correct Answer
A. 14.7 PSIExplanation
Atmospheric pressure at sea level is commonly measured as 14.7 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 due to factors such as weather conditions and altitude, but 14.7 PSI is generally accepted as the standard measurement at sea level.Rate this question:
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- 41.
The stress that resists the force tending to cause one layer of material to slide over an adjacent layer is called
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Bending
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Tension
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Torsion
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Shear
Correct Answer
A. ShearExplanation
Shear stress refers to the stress that opposes the force that tries to cause one layer of material to slide over an adjacent layer. It occurs when two layers of material slide past each other in opposite directions. This type of stress is commonly observed in materials such as metals and can lead to deformation or failure if it exceeds the material's shear strength.Rate this question:
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- 42.
What is the design that uses any combination of longerons, stringers, bulkheads, and frames in the construction of the fuselage called?
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Fuselage
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Longerons
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Monocoque
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Semi-monocoque
Correct Answer
A. Semi-monocoqueExplanation
A semi-monocoque design is a type of fuselage construction that utilizes a combination of longerons, stringers, bulkheads, and frames. In this design, the skin of the fuselage is not solely responsible for carrying the structural loads but is supported by internal structural components such as longerons, stringers, bulkheads, and frames. This design provides a good balance between strength, weight, and flexibility, making it a commonly used construction method for modern aircraft fuselages.Rate this question:
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- 43.
Which of these is attached to the trailing edge of a horizontal stabilizer?
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Flap
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Spoiler
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Rudder
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Elevator
Correct Answer
A. ElevatorExplanation
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 position of the elevator, the pilot can adjust the aircraft's nose-up or nose-down attitude, allowing for changes in altitude and maintaining stability during flight.Rate this question:
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- 44.
When soft iron is brought to a permanent magnet it is
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Charged
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Repelled
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Energized
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Magnetized
Correct Answer
A. MagnetizedExplanation
When soft iron is brought near a permanent magnet, it becomes magnetized. This is because soft iron is a ferromagnetic material, meaning it can be easily magnetized. When it comes in contact with a permanent magnet, the domains within the soft iron align themselves with the magnetic field of the magnet, creating a magnetic field within the soft iron itself. This magnetization is temporary and will disappear once the soft iron is no longer in contact with the permanent magnet.Rate this question:
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- 45.
What type of motor can operate on alternating current or direct current?
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Shunt
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Circuit
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Universal
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Compound
Correct Answer
A. UniversalExplanation
A universal motor can operate on both alternating current (AC) and direct current (DC). This type of motor is designed with a series field winding and a parallel field winding, allowing it to work with both types of current. The series field winding provides high starting torque, making it suitable for applications that require a lot of power at startup. The parallel field winding helps regulate the speed and provides good speed control. Universal motors are commonly used in household appliances like blenders and vacuum cleaners, where they need to be able to operate on both AC and DC power sources.Rate this question:
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- 46.
The advantage of an electrically controlled solenoid valve is its
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Reduced weight
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Increased weight
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Ability to reduce turbulence
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Ability to increase turbulence
Correct Answer
A. Reduced weightExplanation
An electrically controlled solenoid valve is advantageous because it has a reduced weight. This means that it is lighter compared to other types of valves, making it easier to handle and install. The reduced weight also allows for more flexibility in terms of placement and integration into different systems or applications. Additionally, a lighter solenoid valve can contribute to overall weight savings in a system, which can be beneficial in industries such as aerospace or automotive where weight reduction is a key factor.Rate this question:
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- 47.
Another name for the flapper check valve is
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Ball check valve
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Gate check valve
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Cone check valve
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Restrictor check valve
Correct Answer
A. Gate check valve -
- 48.
A unit that is a combination of the landing gear shimmy damper and steering unit is known as
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A steer damper
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An uplock control
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A downlock control
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A servo oscillating damper
Correct Answer
A. A steer damperExplanation
A unit that combines the landing gear shimmy damper and steering unit is known as a steer damper. This unit is responsible for reducing vibrations and oscillations in the landing gear during steering, ensuring smooth and stable movement. It helps to prevent shimmy, which is a rapid side-to-side movement of the landing gear, and improves overall control and stability during landing and taxiing.Rate this question:
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- 49.
The main parts of an aircraft tire are the tread and sidewall,
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Cord body, and beads
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Valve core, and beads
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Cord body, vent holes
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Valve core, and cord body
Correct Answer
A. Cord body, and beadsExplanation
The main parts of an aircraft tire are the cord body and beads. The cord body provides the strength and structure to the tire, while the beads are the inner edges that hold the tire securely on the rim. These two components are crucial for the tire's performance and stability during flight. Other parts mentioned in the options, such as the tread and sidewall, valve core, and vent holes, are also important but not the main parts of the tire.Rate this question:
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