2A551 CDCs Volume 3 Of 3 Ure Questions Only

The correct answer is an Iron Fireman switch. This type of fire detector is frequently used in fire warning systems and consists of a high-nickel steel rod located along the centerline of a stainless steel tube assembly. This design allows for efficient detection of fires and prompt activation of the fire alarm system. The Iron Fireman switch is specifically designed to detect heat and smoke, making it an effective tool in fire safety.

When air gets trapped in a liquid coolant system, it creates a low-pressure condition within the system. This low-pressure condition activates the filter delta pressure switch, which in turn forces the thermal modulating valve to close. As a result, the cooling capability of the coolant is reduced. The presence of air in the coolant hampers its ability to effectively absorb and dissipate heat, thereby reducing its cooling capacity.

Raising the air temperature in a jet engine increases its energy because it allows for better combustion of fuel. When the air temperature is increased, the fuel burns more efficiently, resulting in a higher energy output. This increase in energy improves the overall performance of the jet engine, allowing it to generate more thrust and power. Therefore, increasing the air temperature is crucial for maximizing the energy output of the engine.

Inertia is the property of matter that describes its resistance to change in motion. It is the tendency of an object to remain in its current state of motion, whether it is at rest or moving at a constant velocity. This resistance to change in motion is a fundamental characteristic of matter and is not related to energy, friction, or potential.

The term "combustion range" refers to the operating temperature zone of a jet engine. This is the range of temperatures at which the engine is designed to operate efficiently and effectively. It is important for the engine to maintain a specific temperature range in order to ensure proper combustion and performance. This temperature range is carefully controlled and monitored to prevent overheating or damage to the engine components.

Swirl-type fuel nozzles are designed to provide a high flame speed. The swirling motion of the fuel and air mixture inside the nozzle enhances the mixing and combustion process, resulting in a faster and more efficient flame propagation. This high flame speed is beneficial in applications where quick and intense combustion is required, such as in certain industrial processes or high-performance engines.

The correct answer is centrifugal because of fewer parts. Centrifugal engines have a simpler design compared to axial-flow engines, which require a larger number of components. This complexity in the axial-flow engine's structure increases the manufacturing cost. On the other hand, centrifugal engines have a more straightforward construction, resulting in a lower number of parts needed for their production. Consequently, centrifugal engines are cheaper to manufacture due to their reduced complexity and fewer components.

The most common type of fuel nozzle system is the pressure-atomizing system. This system uses high pressure to atomize the fuel into small particles, allowing for efficient combustion. It is commonly used in applications such as gas turbines and industrial burners. The pressure-atomizing system ensures proper fuel distribution and combustion, resulting in optimal performance and reduced emissions.

A check valve is used by the low-level shutoff valve to prevent the reverse flow of fuel through the valve. A check valve is a one-way valve that allows fluid to flow in one direction but prevents it from flowing back in the opposite direction. In this case, the check valve ensures that fuel does not flow back through the low-level shutoff valve, maintaining the proper flow direction and preventing any potential accidents or damage.

The maximum circuit resistance within a thermocouple circuit is 5 ohms because any resistance higher than this would result in a significant voltage drop across the resistance, leading to inaccurate temperature measurements. The low resistance allows for a minimal voltage drop, ensuring that the thermocouple can accurately measure the temperature difference. Higher resistance would introduce errors and reduce the sensitivity of the thermocouple circuit.

The flameholder is the component that creates local turbulence and reduces gas velocity. It is designed to stabilize the flame in a combustion system by creating recirculation zones and promoting fuel-air mixing. By disrupting the flow of gases, the flameholder helps to maintain a stable and efficient combustion process.

The correct answer is diffuser. A diffuser is a component in a jet engine that is responsible for decreasing the velocity of the air. It does this by expanding the air and slowing it down before it enters the combustion chamber. This is important because it allows the air to mix properly with fuel and ensures efficient combustion. By reducing the velocity, the diffuser helps to increase the pressure of the air, which is necessary for the engine to function effectively.

The air-refueling (A/R) receptacle is operated hydraulically, meaning that it uses hydraulic power to perform its function. However, it is controlled electrically, which means that the control signals for the A/R receptacle are transmitted through an electrical system. This indicates that the hydraulic system and the electrical system work together to operate and control the A/R receptacle.

A blowout disc is a safety feature that protects liquid oxygen (LOX) containers from excessive pressure caused by leaks in the inner container. When the pressure inside the container exceeds a certain limit, the blowout disc ruptures, releasing the excess pressure and preventing the container from exploding. This ensures the safety of the surrounding environment and individuals handling the LOX containers.

The three major sections of all jet engines are the compressor, combustion, and turbine. The compressor is responsible for compressing incoming air, the combustion section mixes fuel with compressed air and ignites it to produce high-pressure and high-temperature gases, and the turbine extracts energy from the high-pressure gases to drive the compressor and other engine accessories. The exhaust section comes after the turbine and is responsible for expelling the exhaust gases. The diffuser is not one of the major sections of a jet engine.

The correct answer is "impulse, reaction, and reaction-impulse." This answer accurately identifies the three design types of turbines used in jet engines. Impulse turbines are primarily used for low-pressure applications, while reaction turbines are used for high-pressure applications. Reaction-impulse turbines combine both impulse and reaction principles to optimize efficiency and power output.

The correct answer is that a sliding gate fuel system valve cannot withstand extreme pressures. This means that when exposed to high levels of pressure, the valve may fail or become damaged. This can lead to fuel leakage or other safety hazards. It is important for a fuel system valve to be able to handle and regulate the pressure of fuel flow effectively to ensure the proper functioning and safety of the system.

The advantage of the high-energy capacitor type jet engine ignition system is that it makes starting possible when the igniter plugs are fouled. This means that even if the igniter plugs become dirty or clogged, the high-energy capacitor type ignition system can still ignite the fuel and start the engine. This is beneficial because it ensures that the engine can still be started even in less than ideal conditions, improving the reliability and performance of the jet engine.

A dual-impeller centrifugal pump is used when a fuel supply is required during periods of negative gravity condition. This type of pump is designed with two impellers that rotate in opposite directions, creating a balanced flow of fuel. The dual-impeller design ensures a consistent and reliable fuel supply even in situations where gravity is working against the flow. This makes it suitable for applications where fuel needs to be supplied in environments with negative gravity conditions.

The primary purpose of the air pressure regulator in a fuel system is to control the amount of pressure entering the fuel tank. This is important because the fuel system requires a specific pressure to operate efficiently. The air pressure regulator ensures that the pressure remains within the desired range by regulating the flow of air into the fuel tank. This helps to maintain a consistent fuel supply and prevent any potential damage or malfunction caused by excessive pressure.

A simple direct current (DC) ignition system consists of a vibrator, igniter plugs, and a transformer. The vibrator is responsible for creating the alternating current (AC) which is then converted to DC by the AC-to-DC converter. The transformer is used to step up the voltage from the DC source to a higher voltage required for ignition. Finally, the igniter plugs are used to create a spark to ignite the fuel-air mixture in the engine.

The direct current (DC) voltage supplied to the lights in a photoelectric circuit is pulsed at a rate of 10 Hz. This means that the voltage is being turned on and off 10 times per second. Pulsing the voltage allows for control over the amount of light being emitted by the lights. By pulsing the voltage at a specific frequency, the lights can be dimmed or brightened as desired. In this case, the lights are being pulsed at a rate of 10 Hz, meaning they are turning on and off 10 times per second.

In a direct current (DC), liquid-level fuel indicating system, the wiper contact is positioned on the resistance strip by the movement of a float in the tanks. The float, which is located in the fuel tanks, moves up and down according to the fuel level. As the float moves, it causes the wiper contact to move along the resistance strip. This movement of the wiper contact allows for the measurement of the fuel level in the tanks. The signals from the amplifier, voltage changes in the indicator circuit, and the amount of bleed air pressure applied to the tank are not directly involved in positioning the wiper contact on the resistance strip.

Fire extinguishing residue, such as that resulting from the use of CB type or foam type fire extinguishing materials, should not be allowed to remain on the equipment for a period exceeding 4 hours. It is important to promptly clean and remove the residue to prevent any potential damage or corrosion to the equipment. Allowing the residue to remain for a longer period could compromise the functionality and safety of the equipment.

The exhaust gas temperature (EGT) indicators are used to measure the temperature of the engine's exhaust gases. The temperature is typically measured in degrees Celsius, as indicated by the answer. This measurement is important for monitoring the engine's performance and ensuring that it is operating within safe temperature ranges. The use of degrees Celsius is a common unit of measurement for temperature in many industries, including automotive and engineering.

Vent holes are used in fiberglass fabric duct installations to prevent swelling when the aircraft climbs to high altitudes. When the aircraft reaches high altitudes, the air pressure decreases, causing the air inside the ducts to expand. Without vent holes, this expansion could cause the ducts to swell and potentially damage the system. Vent holes allow the excess air to escape, relieving the pressure and preventing swelling. This ensures the proper functioning and integrity of the duct system during high altitude flights.

The temperature and pressure in an aircraft engine's bleed air system are influenced by the engine throttle setting and the ambient temperature. The throttle setting determines the amount of air and fuel being supplied to the engine, which affects the temperature and pressure of the exhaust gases. The ambient temperature, on the other hand, affects the temperature of the air entering the engine. Therefore, both factors play a role in determining the temperature and pressure in the bleed air system.

A common type of variable-area orifice used on augmenters is a segmented flap. This type of orifice consists of multiple flaps that can be adjusted to control the flow of a fluid or gas. By manipulating the position of the flaps, the area of the orifice can be increased or decreased, allowing for precise control over the flow rate. This design is often used in applications where a variable flow rate is required, such as in aircraft engines or industrial processes.

The correct answer is transformer. A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction. In the case of a jet engine's AC ignition system, the transformer is responsible for stepping up the voltage from the power source to a high level, such as 20,000 volts, which is then delivered to the igniter plugs. This high voltage is necessary to create a spark and ignite the fuel-air mixture in the engine.

Engine bleed air (EBA) check valves are installed to prevent the loss of compressed bleed air. These valves ensure that the high-pressure bleed air from the engines does not escape or leak out of the system. By preventing the loss of compressed bleed air, the check valves help maintain the proper functioning of various aircraft systems that rely on bleed air, such as cabin pressurization, air conditioning, and anti-icing. The check valves act as a barrier, allowing the flow of bleed air in one direction while blocking it in the opposite direction, thus ensuring the efficient and effective operation of the aircraft's systems.

The correct answer is 10 minutes. An H-2 emergency assembly, also known as a bailout bottle, is designed to supply oxygen to the user in emergency situations. It typically provides oxygen for a maximum of about 10 minutes, giving the user enough time to evacuate or find a safer environment.

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The air turbine (impingement) starter used on jet engines has the advantages of less weight and fewer moving parts than other starters. This means that it is lighter and simpler in design compared to alternative starters. This can be beneficial for aircraft as it reduces the overall weight and complexity of the engine system. Additionally, having fewer moving parts can potentially improve reliability and reduce maintenance requirements.

The manual control valve in the variable isobaric pressurization system is used as an alternate when the cabin pressure controller fails. This means that if the cabin pressure controller malfunctions or stops working, the manual control valve can be used to manually adjust and control the cabin pressure. This ensures that the cabin pressure can still be maintained at the desired level even if the cabin pressure controller is not functioning properly.

Fuel system disconnect couplings are used to interrupt the flow of fuel or air and prevent the loss of fluid. This means that when these couplings are disconnected, it stops the flow of fuel or air, preventing any leakage or loss of fluid. This is important in situations where the fuel or air needs to be controlled, such as during maintenance or repairs, to ensure safety and prevent any accidents or wastage of resources.

The purpose of the pneumatic relay in a cabin pressurization system is to ensure both outflow valves operate at the same time. This is important because it helps maintain the desired cabin pressure by allowing equal airflow through both valves. By synchronizing the operation of the valves, the pneumatic relay helps prevent any imbalances or inconsistencies in cabin pressurization, ensuring the safety and comfort of the passengers and crew onboard the aircraft.

In a jet engine, when two or more turbine wheels are used, a nozzle diaphragm is placed directly in front of each turbine wheel. The nozzle diaphragm helps to control the flow of exhaust gases from the combustion chamber into the turbine section, directing the gases onto the turbine blades for maximum efficiency and power generation. It acts as a guide for the exhaust gases, ensuring that they are properly directed towards the turbine blades to drive the engine.

The primary function of the low-level shutoff valve is to control the flow of fuel being transferred out of a pressurized tank. This valve is responsible for regulating the amount of fuel that is released from the tank, ensuring that it is done in a controlled manner. By controlling the flow, the valve helps prevent any potential issues or accidents that may arise from an uncontrolled release of fuel.

The question asks for a type of oil pump that is not classified based on structure. The options provided are gear, gerotor, rotogear, and sliding vane. Gear and gerotor are both types of oil pumps that are classified based on structure. Sliding vane is another type of oil pump that is also classified based on structure. However, "rotogear" is not a recognized type of oil pump, and therefore does not fit into any classification based on structure.

The correct answer is sliding gate, rotary plug, and disc. These three types of shutoff valves are commonly used in the crossfeed fuel system. The sliding gate valve is designed to regulate the flow of fuel by sliding a gate across the fuel passage. The rotary plug valve uses a rotating plug to control the fuel flow. The disc valve, on the other hand, utilizes a disc that can be rotated to open or close the fuel passage. Together, these three types of valves provide effective control and regulation of fuel flow in the crossfeed fuel system.

The divergent design of a jet engine diffuser increases pressure. This is because a divergent design gradually increases the cross-sectional area of the flow path, allowing the air to expand and slow down. As the air slows down, its kinetic energy is converted into pressure energy, resulting in an increase in pressure.

Pressurization is the correct answer because when the fuel subsystem is pressurized, it helps to prevent fuel boiling. This is important because boiling fuel can cause vapor lock and disrupt the fuel flow, leading to engine failure. By maintaining a certain level of pressure in the fuel system, the boiling point of the fuel is increased, ensuring that it remains in a liquid state and can be effectively delivered to the engine for combustion.

The correct answer is cycling coolant through the electronic component. A liquid coolant system is designed to keep electronic components cool by continuously circulating coolant through the component. This allows the coolant to absorb heat from the electronic component and carry it away, preventing overheating and damage to the electronics. Directing coolant across the electronic component or cycling conditioned air through the component may not be as effective in removing heat as liquid coolant, making them incorrect choices.

The most common type of oil pump in use is the gear pump. This type of pump uses two meshing gears to create suction and move the oil through the pump. The gears rotate and create a seal, trapping the oil between the teeth of the gears and the pump housing. As the gears rotate, the oil is carried from the suction side to the discharge side of the pump. Gear pumps are known for their reliability, efficiency, and ability to handle high pressures.

The correct answer is the ejector nozzle. In a jet engine, the velocity of the stream of air reaches its highest point at the ejector nozzle. The ejector nozzle is responsible for accelerating the exhaust gases and expelling them at high speeds, creating thrust. This high velocity is achieved through the design and shape of the ejector nozzle, which allows for efficient propulsion of the aircraft.

A spring-loaded relief valve is a fuel system component that is used to prevent excessive pressure from building up in trapped lines. It works by using a spring to control the pressure and release it when it reaches a certain level. This helps to protect the fuel system from damage caused by excessive pressure, ensuring that it operates safely and efficiently. The other options, such as the thermal-relief valve, pressure-relief valve, and one-way check valve, may have different functions in the fuel system but do not specifically address the prevention of excessive pressure buildup in trapped lines.

The fuel control in a jet engine is responsible for metering the fuel for combustion. It regulates the flow of fuel to ensure the optimal fuel-air mixture is achieved for efficient combustion. The fuel control takes into account various factors such as engine speed, altitude, and power demand to adjust the fuel flow accordingly. It plays a crucial role in maintaining engine performance and fuel efficiency.

The MSOGS concentrator inlet filter is the correct answer because it is responsible for removing water droplets from the air in a molecular sieve oxygen generating system. The filter acts as a barrier, allowing only dry air to pass through and preventing any water droplets from entering the system. This is important because water droplets can interfere with the functioning of the molecular sieve bed, which is responsible for separating oxygen from other gases. By removing the water droplets, the concentrator inlet filter ensures the efficient and effective operation of the MSOGS.

The output pressure and flow ratings of a centrifugal-type fuel pump are greater than the system needs in order to provide an ample supply of fuel in case of a single pump failure. This means that even if one pump fails, the remaining pump(s) can still deliver enough fuel to the engines to keep them running. This redundancy ensures that the aircraft can continue to operate safely and avoid any potential engine failure due to fuel shortage.

When the temperature of the bleed air from a cargo-type air conditioning system's primary heat exchanger exceeds 540 degrees F, the high limit section of the temperature anticipator will close the bleed air regulating and shutoff valve. This is because the high temperature indicates a potential risk of overheating or damage to the system. By closing the bleed air regulating and shutoff valve, the flow of hot air into the system is restricted, helping to prevent any further increase in temperature and ensuring the safety and proper functioning of the air conditioning system.