CDC Volume 2 UREs 2AX5X

The greater the current flow through an electromagnet, the greater the strength. This is because the strength of an electromagnet is directly proportional to the amount of current flowing through it. As the current increases, the magnetic field produced by the electromagnet becomes stronger, resulting in a greater overall strength.

In aircraft circuits, the current flow is controlled by switches. Switches are used to open or close the circuit, allowing or preventing the flow of electricity. They provide a means to control the electrical system, turning it on or off as needed. Fuses are used to protect the circuit from excessive current, but they do not directly control the flow of current. Signals are used for communication and do not control current flow. Batteries provide the power source for the electrical system but do not control the flow of current.

A nickel-cadmium battery can be fully charged only by a constant current. This is because the charging process for this type of battery requires a steady flow of current to ensure that the nickel and cadmium materials within the battery are properly charged. Pulsating current, varying current, and eddy current are not suitable for fully charging the battery as they do not provide a consistent and stable flow of current. Only a constant current can ensure that the battery reaches its maximum charge capacity.

Deboosters are used to reduce braking pressure. When the brakes are applied, the deboosters decrease the force exerted on the brake system, resulting in a reduction of the braking pressure. This is important in certain situations where excessive braking force could lead to skidding or loss of control. By reducing the braking pressure, deboosters help to ensure a safer and more controlled braking experience.

The torsion links on a main landing gear are designed to prevent the inner cylinder from rotating within the outer cylinder. This is important because if the inner cylinder were allowed to rotate, it could cause instability and potential damage to the landing gear system. By preventing this rotation, the torsion links help to maintain the proper alignment and function of the landing gear during operation.

Proximity sensors are electromagnetic devices that can detect magnetically conducive metal targets on landing gears. These sensors are designed to sense the presence or absence of an object without physical contact. They are commonly used in various applications, including industrial automation, robotics, and security systems, to detect the proximity of objects. Therefore, proximity sensors are the correct answer to this question.

A 24-volt nickel-cadmium battery typically consists of multiple cells connected in series. Each cell has a nominal voltage of 1.2 volts. To achieve a total voltage of 24 volts, the battery would require 20 cells (20 cells x 1.2 volts = 24 volts). Therefore, the correct answer is 20 cells.

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Drag is the force that acts parallel to the relative wind. It is a resistance force that opposes the motion of an object through a fluid, such as air. In the context of aerodynamics, drag is caused by the interaction between the object and the air molecules. It is important to minimize drag in order to maximize the efficiency and speed of an object moving through a fluid medium.

A shunt type motor has low starting torque and good speed regulation because it has a field winding that is connected in parallel (shunt) with the armature. This configuration allows the motor to have a relatively constant speed regardless of the load, resulting in good speed regulation. However, the shunt motor has a lower starting torque compared to other types of motors, which means it may struggle to start heavy loads.

A hydraulic reservoir serves multiple purposes. Firstly, it replenishes fluid in the hydraulic system, ensuring that an adequate supply of fluid is available for operation. Secondly, it allows for thermal expansion, as hydraulic systems generate heat during operation, causing the fluid to expand. The reservoir provides space for this expansion, preventing damage to the system. Lastly, the reservoir provides a means of bleeding air from the system, as air can enter the hydraulic system and cause inefficiencies or malfunctions. Therefore, the correct answer is that a hydraulic reservoir replenishes fluid, allows for thermal expansion, and provides a means of bleeding air from the system.

A standpipe in a reservoir is designed to reserve fluid specifically for the emergency pump. In case of any unforeseen circumstances or emergencies, the standpipe ensures that there is a sufficient amount of fluid available to power the emergency pump, allowing it to function properly and provide the necessary fluid supply. This helps to ensure the safety and reliability of the system in critical situations.

The amount of fluid a pump produces on each cycle or revolution is referred to as its displacement. This term is commonly used in pump technology to describe the volume of fluid that is moved or transferred by the pump during each rotation or cycle. It is an important parameter to consider when selecting a pump for a specific application, as it determines the pump's capacity and efficiency.

The correct answer is 8,000 RPM. A constant speed drive is used to maintain a consistent rotational speed in a generator. In this case, the drive is used for a 60/80 kilovolt ampere generator. The speed at which the drive operates is approximately 8,000 RPM, ensuring that the generator produces a steady output of power.

Crazing refers to the network of ultrafine cracks that develop on or under the surface of transparent plastics. This phenomenon occurs due to stress or environmental factors, causing the material to weaken and form these cracks. Crazing is commonly seen in acrylics and other transparent plastics, and it can affect the appearance and structural integrity of the material.

The pistons in the Stratopower variable-volume pump are held in contact with the cam plate by the nutating plate. The nutating plate is responsible for maintaining the necessary pressure and contact between the pistons and the cam plate during operation. This ensures efficient pumping and proper functioning of the pump.

The piston is installed in an accumulator with the hollow end facing towards the air side. This is because the air side of the accumulator is where the compressed gas is stored, and the hollow end of the piston allows the gas to flow freely. By positioning the hollow end towards the air side, the piston can effectively separate the gas and fluid sides of the accumulator, preventing any mixing or contamination.

The hydraulic manifold is a component in a hydraulic system that allows multiple fluid lines to come together in a common location. This is important because it enables the system to distribute hydraulic fluid to different components or actuators efficiently. By having a central point where the fluid lines can join together, the system can maintain proper fluid pressure and flow, ensuring optimal performance. Therefore, the correct answer is that the hydraulic manifold allows common fluid lines to come together.

The correct answer is plate. In a battery, the plate is the internal component that acts as a grid or framework to support the active chemical materials. The plate helps to hold the active chemicals in place and allows for the flow of electrons during the battery's operation. Without the plate, the battery would not be able to function properly.

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 run longitudinally along the fuselage and wings, helping to distribute loads and maintain the structural integrity of the aircraft. Longerons are longer structural members that run parallel to the fuselage, providing additional strength and support. Bulkheads are vertical partitions that separate different compartments within the aircraft. Frames are horizontal structural members that provide support and shape to the aircraft structure. Therefore, out of the given options, stringers are the correct answer.

Turbulence in a hydraulic line disrupts the smooth flow of fluid, causing resistance to the flow. This resistance leads to a loss of energy as the fluid encounters obstacles and experiences friction. Therefore, turbulence affects fluid-flow in a hydraulic line by creating resistance and resulting in a loss of energy.

The centering switch prevents the lock solenoid from energizing when the nose landing gear is off center. This switch is designed to detect the position of the landing gear and ensure that it is properly centered before allowing the lock solenoid to be energized. If the landing gear is not centered, the switch will prevent the solenoid from engaging, thereby ensuring the safety of the aircraft during takeoff and landing.

Variable-volume pumps do not require a separate pressure-regulating device in the system because they have an integral compressor. This means that the pump itself is able to regulate the pressure in the system without the need for an additional device. The integral compressor allows the pump to adjust the volume of fluid being delivered, which in turn controls the pressure. Therefore, there is no need for a separate pressure-regulating device.

Wing flaps are used to increase lift and drag. By extending the flaps, the curvature of the wing increases, which generates more lift. This is particularly useful during takeoff and landing when the aircraft needs more lift at lower speeds. However, the increased curvature also creates more drag, which helps to slow down the aircraft during landing. Therefore, the purpose of wing flaps is to simultaneously increase lift and drag.

Thermal relief plugs prevent tire explosion from excessive heat build up. These plugs are designed to release built-up pressure and heat in the tire. As the tire heats up during use, the air inside expands, creating pressure. If this pressure is not released, it can cause the tire to explode. Thermal relief plugs provide a safe way for the pressure to escape, preventing any potential explosion and ensuring the tire remains intact.

A pneudraulic system component that uses a double-acting balanced actuating cylinder is the nosewheel steering. This component is responsible for controlling the movement and direction of the nosewheel in an aircraft. The double-acting cylinder allows for precise and balanced movement of the nosewheel, ensuring smooth steering and maneuverability on the ground.

Brake fade refers to a gradual loss of braking action. This can occur when the brakes overheat. When the brakes become too hot, the friction between the brake pads and the rotor decreases, resulting in a loss of braking power. Therefore, the correct answer is "loss due to overheating".

The manual slide-type hydraulic selector valve has the advantage of metering ability. This means that it can control the flow rate of hydraulic fluid, allowing for precise and controlled movement of hydraulic actuators. This is especially useful in applications where fine control and accuracy are required, such as in industrial machinery or heavy equipment. By adjusting the position of the slide, the valve can regulate the flow of fluid and ensure smooth and controlled operation of the hydraulic system.

The reservoir supplies hydraulic fluid to a hand pump by gravity and the suction effect of the pump. This means that the hydraulic fluid flows down from the reservoir due to gravity, but it is also aided by the suction created by the pump. The combination of these two factors allows for a steady flow of hydraulic fluid to the hand pump, ensuring its proper functioning.

The primary force an airfoil has to defeat is weight. Weight is the force exerted on an object due to gravity. In order for an airfoil to generate lift and stay in the air, it needs to overcome the force of gravity pulling it down. Drag is the resistance encountered by the airfoil as it moves through the air, thrust is the force propelling the airfoil forward, and lift is the upward force generated by the airfoil's shape. However, the airfoil must first overcome its weight before any of these other forces can come into play.

The motion of the landing gear control lever is transmitted to the selector valve by a cable system. This means that there is a series of cables connecting the lever to the valve, allowing the movement of the lever to be transferred to the valve. This cable system ensures that when the lever is moved, it effectively controls the position and operation of the selector valve, allowing for the proper functioning of the landing gear.

The underspeed switch on the 60/80 kilovolt ampere generator constant speed drive actuates at 365 Hz. This means that when the generator's frequency drops below 365 Hz, the underspeed switch will be activated. This switch is a safety feature that helps protect the generator from operating at dangerously low speeds, which could potentially damage the equipment or cause a power outage.

A pneudralic system is a combination of hydraulic and pneumatic systems. It uses compressed air to generate force and transmit it through hydraulic fluid. A single-acting actuating cylinder is a component that uses air pressure to move a piston in one direction only. In the context of the given options, a brake assembly is the most likely component to use a single-acting actuating cylinder. When the brake pedal is pressed, air pressure is applied to the actuating cylinder, which then moves the brake pads or shoes to apply pressure to the brake rotor or drum, resulting in braking action.

The snubbing mechanism slows the free fall of the main landing gear during the emergency extension sequence. This mechanism is designed to provide controlled and gradual extension of the landing gear to prevent sudden impacts or jolts upon landing. It acts as a buffer or shock absorber, allowing the landing gear to extend smoothly and safely.

Adjusters automatically compensate for brake wear on the segmented rotor brake. As the brake pads wear down over time, the adjusters gradually increase the distance between the pads and the rotor to maintain optimal braking performance. This ensures that the brake system continues to function effectively and safely, even as the brake components experience normal wear and tear.

Tapered roller bearings are used on aircraft wheels because they can handle both radial and axial loads, making them ideal for supporting the weight of the aircraft during landing and takeoff. These bearings are designed with tapered inner and outer races, allowing them to distribute the load evenly and efficiently. This helps to reduce friction and ensure smooth rotation of the wheels, enhancing the overall performance and safety of the aircraft.

In hydraulic hand pumps, double-action means that fluid-flow is created with each stroke of the pump handle. This means that with every movement of the handle, fluid is pumped and flows through the system. This is different from other options where fluid flow is created with every other stroke or double volume is displaced with each stroke.

Vent holes prevent pressure buildup and separation of cord plies or tread rubber on an aircraft tire. These holes allow air to escape from the tire, preventing excessive pressure from building up. This helps to maintain the integrity of the tire and prevent any potential damage or failure. Without vent holes, the pressure inside the tire could increase to dangerous levels, leading to the separation of cord plies or tread rubber.

The correct answer is cantilever. Cantilever wing design refers to a wing that is self-supporting and does not require external bracing or support structures. This design is commonly used in modern military aircraft as it offers better aerodynamic efficiency and reduces drag. The cantilever design allows for a sleeker and more streamlined aircraft, enhancing its maneuverability and overall performance.

The correct answer is "fin". The fin is the fixed vertical surface of the empennage, which is the tail section of an aircraft. It provides stability and helps to keep the aircraft's nose pointed straight during flight. The stabilator is a combination of a stabilizer and an elevator, which is a movable horizontal surface used for pitch control. The elevator is also a movable surface, but it is located on the horizontal stabilizer and is used for controlling the aircraft's pitch. The rudder is a movable surface located on the vertical stabilizer, and it is used for controlling the aircraft's yaw.

The basic units of a hydraulic hand pump system include a reservoir, pump, actuator, and manual shutoff valve. The reservoir stores the hydraulic fluid, the pump pressurizes the fluid, the actuator converts the fluid pressure into mechanical force, and the manual shutoff valve controls the flow of the fluid. These components work together to create a hydraulic system that can generate and control mechanical power.

A permanent magnet is produced from a material with high reluctance, and low permeability. Reluctance refers to the opposition of a material to the flow of magnetic flux, and in the case of a permanent magnet, high reluctance ensures that the magnetic field remains concentrated within the magnet. Low permeability means that the material does not readily allow the magnetic field to pass through it, which helps in maintaining the magnet's strength. Therefore, a material with high reluctance and low permeability is ideal for producing a permanent magnet.

The correct answer is engine oil and blast air. Brushless AC generators are cooled using a combination of engine oil and blast air. Engine oil is used to cool the internal components of the generator, such as the stator and rotor, which can generate heat during operation. Blast air is then used to further cool the generator by blowing air over the external surfaces, dissipating heat and preventing overheating. This combination of engine oil and blast air ensures efficient cooling and optimal performance of the generator.

When the camshaft is rotated to unseat one pressure poppet and one return poppet, it means that the valve is in a working position. This is because the purpose of a poppet-type selector valve is to control the flow of fluid in a hydraulic system. By unseating one pressure poppet and one return poppet, the valve allows the fluid to flow from the pressure side to the return side, enabling the system to function properly.

When making a right turn, the relative position of the ailerons is such that the right aileron trailing edge is up and the left aileron trailing edge is down. This configuration helps to increase the lift on the right wing and decrease the lift on the left wing, causing the aircraft to roll to the right. By raising the trailing edge of the right aileron and lowering the trailing edge of the left aileron, the pilot can effectively control the aircraft's roll and execute a right turn.

Solenoid valves are typically used to control the flow of fluids in hydraulic systems. They are electromechanical devices that use a solenoid to open or close the valve, allowing or blocking the flow of hydraulic fluid. Solenoid valves are commonly found in various applications, including industrial machinery, automotive systems, and irrigation systems. They are reliable and efficient in controlling the flow of fluids, making them a suitable choice for positioning hydraulic selector valves.

The bearing cone of an aircraft wheel bearing is called the inner race. The inner race is the part of the bearing that rotates with the wheel, while the outer race remains stationary. It is responsible for reducing friction and allowing smooth rotation of the wheel. The inner race is typically made of hardened steel and is designed to withstand the loads and stresses associated with aircraft operations.

When the pressure in a hydraulic system with a variable-volume pump increases, the fluid-flow decreases. This is because the increased pressure causes the pump to reduce the volume of fluid being pumped, resulting in a decrease in the flow rate. As the pump adjusts to the higher pressure, it decreases the volume of fluid being pushed, which in turn decreases the flow of the fluid in the system.

The aileron is the flight control surface that controls the aircraft about the longitudinal axis. It is located on the outer trailing edge of each wing and is used to create a differential lift, causing the aircraft to roll and bank. By deflecting the ailerons, the pilot can control the aircraft's roll and maintain balance during turns. The rudder controls the aircraft about the vertical axis, the elevator controls the aircraft about the lateral axis, and the wing flaps are used to increase lift and decrease stall speed during takeoff and landing.

A servo valve is a type of valve that is specifically designed to control the flow of fluid. It is typically used in hydraulic systems to regulate the amount and direction of fluid flow. In contrast, a selector valve is a type of valve that has four ports and is used to direct fluid flow to different paths or circuits. While both valves are used in fluid control, the main difference lies in their functionality - a servo valve is specifically designed to control fluid flow, whereas a selector valve is used to direct fluid flow.