CDC 2AX5X Volume 3

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1. The most prevalent method of refueling for ground servicing is

Explanation

The correct answer is single-point. Single-point refueling is the most prevalent method of refueling for ground servicing. It involves using a single nozzle or connection point to refuel an aircraft, which allows for faster and more efficient refueling compared to other methods. This method is commonly used in commercial aviation, where large volumes of fuel need to be loaded quickly and safely.

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About This Quiz
CDC 2AX5X Volume 3 - Quiz

The CDC 2AX5X Volume 3 quiz assesses knowledge on aircraft oxygen systems, covering natural oxygen properties, system valves, tubing identification, and oxygen regulators. It is crucial for professionals... see morein aerospace and aircraft maintenance. see less

2. At a minimum, what should you wear when taking an oil sample?

Explanation

When taking an oil sample, it is important to wear goggles and gloves. Goggles protect the eyes from any potential splashes or spills that may occur during the sampling process. Gloves, on the other hand, protect the hands from coming into direct contact with the oil, which may contain harmful chemicals or contaminants. Wearing both goggles and gloves ensures that the person taking the sample is adequately protected from any potential hazards.

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3. The supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is

Explanation

The supply and distribution tubing for aircraft oxygen systems is identified by green and white cellulose tape. This color combination is used to distinguish the tubing from other systems in the aircraft. It helps maintenance personnel easily identify and locate the oxygen tubing for inspection, repair, or replacement. The green and white tape serves as a visual indicator and ensures that the oxygen system is properly maintained and serviced.

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4. A liquid fire extinguishing agent douses a fire by

Explanation

A liquid fire extinguishing agent douses a fire by excluding oxygen from the area. Oxygen is necessary for combustion to occur, so by removing or reducing the presence of oxygen, the fire is deprived of the fuel it needs to sustain itself. This effectively extinguishes the fire.

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5. The arrow stamped on the body of a fuel system check valve indicates the

Explanation

The arrow stamped on the body of a fuel system check valve indicates the direction of free flow. This means that the fuel will flow in the direction that the arrow is pointing, allowing for proper functioning of the check valve. It is important to follow the direction of flow indicated by the arrow to ensure that the fuel system operates correctly and efficiently.

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6. The two types of oil coolers used in jet engine oil systems are air/oil and

Explanation

The correct answer is fuel/oil. Jet engine oil systems use two types of oil coolers, which are air/oil and fuel/oil. The air/oil cooler cools the oil by passing it through a heat exchanger that is cooled by airflow. On the other hand, the fuel/oil cooler cools the oil by utilizing the cooler fuel as a heat sink. This helps in maintaining the oil temperature within acceptable limits and ensures efficient lubrication and cooling of the engine components.

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7. The disadvantage of a continuous-flow oxygen regulator is that it

Explanation

A continuous-flow oxygen regulator wastes oxygen because it delivers a constant flow of oxygen regardless of whether the user is inhaling or exhaling. This means that oxygen is being continuously released even when it is not being used by the individual, resulting in wastage.

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8. What is usually located at the lowest point in a fuel tank?

Explanation

The sump and drain are usually located at the lowest point in a fuel tank. The sump is a reservoir that collects any sediment or water that may have accumulated in the tank. The drain is used to remove this accumulated sediment or water from the tank. This design ensures that any impurities or contaminants in the fuel settle at the bottom of the tank and can be easily drained out, preventing them from entering the fuel system and causing damage.

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9. Fuel-controlled switches normally control circuits that indicate

Explanation

Fuel-controlled switches are designed to control circuits that indicate various aspects related to fuel. This includes fuel-flow, fuel level, and fuel pressure. These switches are responsible for monitoring and regulating these parameters, providing important information to the operator or system. Therefore, the correct answer is "all of the above" as fuel-controlled switches control circuits that indicate fuel-flow, fuel level, and fuel pressure.

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10. A well-designed aircraft fuel system will ensure

Explanation

A well-designed aircraft fuel system needs to ensure a positive and reliable fuel-flow under all conditions. This means that the fuel system should consistently deliver fuel to the engine in a reliable manner, regardless of the operating conditions or external factors. The system should be designed to prevent any interruptions or fluctuations in the fuel-flow, ensuring a continuous and steady supply of fuel to the engine for optimal performance and safety.

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11. What tool do you use to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting

Explanation

A rawhide mallet is used to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting. The rawhide material is soft and non-damaging, allowing the user to tap the clamp into place without causing any damage or distortion to the ducting or clamp. This ensures a proper seal and alignment, preventing any air leakage or misalignment in the ducting system.

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12. What type of foreign particle appears in the fuel in a crystalline, granular, or glasslike form?

Explanation

Sand or dust particles can appear in fuel in a crystalline, granular, or glasslike form. These foreign particles can contaminate the fuel system and cause damage to the engine components. Sand or dust can enter the fuel through various means such as improper filtration, contaminated storage tanks, or during the refueling process. It is important to regularly inspect and clean the fuel system to prevent the presence of these particles and ensure the proper functioning of the engine.

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13. In its natural state oxygen is?

Explanation

Oxygen in its natural state does not have a taste, color, or odor. This means that when oxygen is in its natural form, it cannot be detected by our senses of taste, sight, or smell.

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14. "The simultaneous control of temperature, humidity, and air distribution within a space" is the definition of

Explanation

Air conditioning refers to the simultaneous control of temperature, humidity, and air distribution within a space. This system is responsible for maintaining a comfortable and controlled environment by regulating the temperature and humidity levels, as well as ensuring proper air circulation. Engine bleed air refers to the extraction of compressed air from the engine for various purposes, pressurization refers to the process of maintaining a higher pressure inside a space compared to the surrounding environment, and air control is a vague term that does not specifically encompass all the aspects mentioned in the definition.

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15. The rapid cooling of bleed air causes

Explanation

When bleed air is rapidly cooled, the temperature of the air decreases, causing the moisture present in the air to condense. This condensation occurs in the form of fog, as the water vapor in the air turns into tiny water droplets. Therefore, the correct answer is that the rapid cooling of bleed air causes moisture to condense in the form of fog.

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16. The low atmospheric pressure found at extremely high altitudes can cause a person's blood vessels to

Explanation

The low atmospheric pressure at extremely high altitudes can cause a person's blood vessels to rupture. When the atmospheric pressure decreases, the pressure inside the blood vessels becomes higher than the surrounding pressure. This pressure difference can lead to the rupture of blood vessels, especially the smaller ones. This can result in internal bleeding and other health complications.

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17. The ability to do work is the definition of

Explanation

Energy is defined as the ability to do work. It is the capacity of a system to perform tasks or exert force on another object. Energy can exist in various forms such as kinetic energy, potential energy, thermal energy, and so on. In this context, the correct answer is energy because it aligns with the definition provided. Inertia refers to an object's resistance to change in motion, friction is the force that opposes motion, and velocity is the rate of change of displacement.

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18. Air and gases flowing through a jet engine require

Explanation

In a jet engine, air and gases need to be accelerated to produce thrust. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. As the air and gases are accelerated in the engine, they exert a force on the engine in the opposite direction, propelling the aircraft forward. To achieve this, the velocity of the air and gases exiting the engine must be greater than the velocity at which they entered. This ensures that the engine generates enough thrust to propel the aircraft forward.

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19. After air is drawn into the guide vanes of a centrifugal jet engine compressor, it is subjected to

Explanation

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20. What lubricant can be used on a beaded channel clamp sleeve to ease installation?

Explanation

Water can be used as a lubricant on a beaded channel clamp sleeve to ease installation. Water acts as a temporary lubricant that reduces friction between the sleeve and the channel, making it easier to slide the sleeve into place. It is a common and easily accessible lubricant for this purpose.

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21. A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to

Explanation

A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to expel the agent from the bottle. This is because the pressure from the nitrogen gas builds up inside the bottle, causing the liquid agent to be forced out when the extinguisher is discharged. The expelled agent then acts to suppress the fire by smothering it or cooling it down, depending on the type of extinguishing agent used. The nitrogen charge is essential for propelling the agent out of the bottle effectively and efficiently.

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22. How are fuel leaks categorized?

Explanation

Fuel leaks are categorized into Class A through D. This classification system helps in identifying the severity and potential danger of the fuel leak. Class A refers to the most severe leaks, which pose an immediate threat to life and property. Class D, on the other hand, represents the least severe leaks, which may not pose an immediate danger. This categorization allows for better prioritization and appropriate response measures to be taken based on the severity of the fuel leak.

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23. Through the use of spectrometric oil analysis, aircraft will have a higher in-commission rate because there will be

Explanation

Spectrometric oil analysis allows for more accurate monitoring of the oil in aircraft engines. This helps to identify potential issues early on, allowing for timely maintenance and reducing the likelihood of unnecessary maintenance. By detecting problems before they become major issues, aircraft can stay in commission for longer periods of time, resulting in a higher in-commission rate. Therefore, the correct answer is less unnecessary maintenance.

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24. What is defined as "a depression in the duct wall, where the surface of the material isn't cut or removed but the depression has caused sharp bends or creases in the material?"

Explanation

A major dent is defined as a depression in the duct wall that causes sharp bends or creases in the material, without cutting or removing the surface of the material. This suggests that the dent is significant and has caused noticeable damage to the material.

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25. A bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of

Explanation

A bladder-type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of rubber or nylon material. Rubber and nylon are both soft and malleable materials that can easily adapt to the shape of the cavity. These materials can be molded and stretched to fit the available space, ensuring a tight and secure fit. Additionally, rubber and nylon are also flexible, which allows the tank to expand and contract as needed during changes in pressure or temperature.

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26. A micron is a metric linear measurement equal toA micron is a metric linear measurement equal to

Explanation

A micron is a metric linear measurement that is used to measure very small distances, typically in the field of microscopy. It is equal to 1/25,000 of an inch, which means that it is a very tiny unit of measurement. This makes it particularly useful for measuring objects at the microscopic level, where precision is crucial.

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27. What do you use to create a static seal between two stationary parts in the oil system?

Explanation

A gasket is used to create a static seal between two stationary parts in the oil system. It is a mechanical seal that fills the gap between the two parts, preventing leakage of fluids or gases. Gaskets are commonly made of materials such as rubber, metal, or composite materials, and they are designed to withstand high temperatures and pressures. By providing a tight seal, gaskets ensure the proper functioning and efficiency of the oil system.

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28. Liquid oxygen (LOX) converts to gaseous oxygen (GOX) at an expansion ratio of

Explanation

Liquid oxygen (LOX) converts to gaseous oxygen (GOX) at an expansion ratio of 860 to 1. This means that when liquid oxygen is converted to its gaseous form, it expands to 860 times its original volume. This expansion ratio is important in various applications where oxygen is used, such as rocket propulsion systems, as it allows for efficient storage and transportation of oxygen in its liquid state, which can then be easily converted to gas when needed.

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29. Bleed air is usually taken from which part of the engine section?

Explanation

Bleed air is usually taken from the compressor section of the engine. The compressor is responsible for compressing incoming air before it enters the combustion chamber. Bleed air is extracted from the compressor at various stages and is used for various purposes such as cabin pressurization, air conditioning, anti-icing, and hydraulic system operation. Extracting air from the compressor ensures that the air is at a high pressure and temperature, making it suitable for these applications.

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30. What aircraft air conditioning system component is a radiator that cold ram air passes through in order to cool the hot bleed air from the engine(s)?

Explanation

The primary heat exchanger is a component in the aircraft air conditioning system that cools the hot bleed air from the engine(s) by passing cold ram air through it. This process helps to regulate the temperature inside the aircraft and maintain a comfortable environment for passengers and crew. The primary heat exchanger acts as a radiator, dissipating the heat from the bleed air and cooling it down before it is circulated throughout the cabin.

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31. What is the basic purpose of the fuel vent system?

Explanation

The basic purpose of the fuel vent system is to prevent fuel tank rupture or collapse. This system allows the release of pressure that builds up inside the fuel tank due to temperature changes or fuel consumption. Without a properly functioning vent system, the pressure inside the tank could become too high, leading to potential damage or failure of the tank. By allowing the release of pressure, the vent system helps to maintain the structural integrity of the fuel tank and prevent any potential accidents or hazards.

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32. Fuel's ability to hold contaminants in suspension is increased with a higher

Explanation

The ability of fuel to hold contaminants in suspension is increased with a higher viscosity. Viscosity refers to the thickness or resistance to flow of a liquid. When fuel has a higher viscosity, it means it is thicker and more resistant to flow. This thicker fuel can effectively hold contaminants, such as dirt or particles, in suspension, preventing them from settling at the bottom of the fuel tank or clogging fuel filters. Therefore, a higher viscosity enhances the fuel's ability to keep contaminants suspended in the fuel system.

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33. Classification of fuel leaks is necessary in order to determine

Explanation

Classification of fuel leaks is necessary in order to determine whether or not they constitute a flight safety hazard. This is important because fuel leaks can pose significant risks to the safety of an aircraft and its passengers. By classifying the leaks, aviation authorities and maintenance personnel can assess the severity and potential consequences of the leaks, and take appropriate measures to mitigate the safety risks. This may involve repairing the leak, replacing faulty components, or grounding the aircraft until the issue is resolved.

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34. What is the purpose of the exhaust duct?

Explanation

The purpose of the exhaust duct is to straighten the flow of exhaust gas. This is important because exhaust gas often exits the system in a turbulent and uneven manner. By straightening the flow, the exhaust gas can be directed more efficiently, reducing turbulence and improving overall performance. This helps to optimize the function of the exhaust system and ensure that the gas flows smoothly out of the system.

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35. What type of fuel control uses thermocouples, relays, amplifiers, and solenoids, to help control the engine?

Explanation

Electrohydromechanical fuel control uses a combination of electronic and hydraulic components to regulate the fuel flow in an engine. Thermocouples are used to measure temperature, relays are used to control electrical circuits, amplifiers are used to amplify electrical signals, and solenoids are used to control the flow of hydraulic fluid. This type of fuel control system offers precise control over the fuel flow, ensuring efficient and optimal engine performance. Pneumatic fuel control relies on air pressure, fuel injection uses injectors to deliver fuel, and hydromechanical fuel control uses mechanical components to regulate fuel flow, making them incorrect options.

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36. What prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops?

Explanation

A pressure/vacuum relief valve prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops. This valve is designed to release excess pressure or vacuum within the tank, ensuring that the tank remains at a safe pressure level. By opening when the pressure or vacuum exceeds a certain threshold, the relief valve prevents the tank from collapsing or becoming damaged.

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37. The combustion efficiency of a gas turbine is usually between

Explanation

The combustion efficiency of a gas turbine is typically between 95 and 100 percent. This means that the turbine is able to effectively convert the energy from the fuel into mechanical work. A high combustion efficiency indicates that there is minimal waste or unburned fuel, resulting in maximum utilization of the fuel's energy.

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38. Fuel that accumulates after a failed start or after engine shutdown is

Explanation

When fuel accumulates after a failed start or engine shutdown, it needs to be removed from the system. The correct answer states that the fuel is drained overboard by a drain system. This means that the excess fuel is removed from the engine and disposed of outside of the system. This is a common practice to ensure that the engine does not get flooded with excessive fuel and to prevent any potential damage or malfunction.

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39. The purpose of a fuel/oil cooler in a fuel system is to

Explanation

The purpose of a fuel/oil cooler in a fuel system is to heat the fuel and cool the oil. This is important because fuel needs to be heated in order to vaporize and combust efficiently, while oil needs to be cooled to prevent it from overheating and breaking down. By heating the fuel and cooling the oil, the fuel/oil cooler helps to optimize the performance and longevity of the fuel system.

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40. Except during servicing, the liquid oxygen (LOX) system's combination fill, buildup, and vent valve is always in the

Explanation

The liquid oxygen (LOX) system's combination fill, buildup, and vent valve is always in the buildup position, except during servicing. This means that the valve is set to allow the buildup of pressure in the system. This position is necessary for the proper functioning of the LOX system and ensures that the required pressure is maintained during normal operation.

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41. The fire detector, frequently used in fire warning systems, that has a high-nickel steel rod located along the centerline of a stainless steel tube assembly is called

Explanation

The correct answer is "an Iron Fireman switch." This is because an Iron Fireman switch is a type of fire detector commonly used in fire warning systems. It consists of a high-nickel steel rod located along the centerline of a stainless steel tube assembly, which allows it to detect the presence of fire and trigger the necessary response.

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42. Another name for the disc type valve in a fuel system is

Explanation

The correct answer is butterfly. A disc type valve in a fuel system is commonly known as a butterfly valve. This type of valve consists of a disc or plate that rotates around a shaft, resembling the wings of a butterfly. The disc can be positioned to control the flow of fuel, allowing it to open or close the passage. The term "butterfly" is used to describe this valve due to its resemblance to the insect's wings.

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43. Some fuel level control valves have a dual-float system so that

Explanation

A fuel level control valve with a dual-float system provides a double safety factor because it uses two floats to monitor the fuel level. This redundancy ensures that even if one float fails, the other will still function properly and prevent overfilling or underfilling of the tank. Having two floats increases the reliability and safety of the valve, making it an ideal choice for fuel level control systems.

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44. Which type of fuel contaminant can form a red, brown, gray, or black slime in the fuel?

Explanation

Microbial growth can form a red, brown, gray, or black slime in the fuel. Microbes such as bacteria and fungi can contaminate fuel and create a slimy substance. This growth occurs when water is present in the fuel, providing a suitable environment for microbes to thrive. The slime can clog filters, fuel lines, and injectors, leading to engine problems and reduced performance. Regular fuel maintenance and treatment with biocides can help prevent microbial growth and its associated issues.

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45. Exhaust gas temperature (EGT) indicators indicate the engine EGT in

Explanation

Exhaust gas temperature (EGT) indicators are used to measure the temperature of the engine's exhaust gases. The correct answer is degrees Celsius because Celsius is the commonly used unit for measuring temperature in most parts of the world, including the automotive industry. It is important to monitor the EGT as it can indicate the performance and efficiency of the engine, as well as help prevent damage or overheating.

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46. The three benefits of the Joint Oil Analysis Program (JOAP) are improved safety, reduced maintenance cost, and

Explanation

The Joint Oil Analysis Program (JOAP) offers several benefits, including improved safety, reduced maintenance cost, and increased equipment availability. While recycling of used oil and production of wear metals may also be advantageous, the focus here is on the benefit of increased equipment availability. This means that JOAP helps ensure that equipment is readily available for use, minimizing downtime and maximizing productivity.

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47. Expansion joints in bleed air systems are best used for

Explanation

Expansion joints in bleed air systems are best used for a short run of ducting. Expansion joints are designed to absorb the thermal expansion and contraction that occurs in ducting systems due to temperature changes. They allow for the movement and flexibility of the ducting, preventing stress and damage. In a short run of ducting, the expansion and contraction are more pronounced, making expansion joints particularly necessary to accommodate these movements. In longer runs of ducting, the expansion and contraction are spread out over a larger area, reducing the need for expansion joints.

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48. What controls the action of the outflow valve in a fixed-isobaric, single-differential pressurization system?

Explanation

The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by regulating control chamber pressure. This means that the pressure in the control chamber is adjusted to control the opening and closing of the outflow valve, which regulates the cabin pressure. The other options, such as a jet pump, filtering cabin air, or the unpressurized range, do not directly control the action of the outflow valve in this type of pressurization system.

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49. In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie-shaped sections?

Explanation

The frangible disc in a liquid-agent fire extinguisher container is undercut into pie-shaped sections in order to prevent small pieces from passing through the strainer. By dividing the disc into sections, it ensures that even if the disc breaks, the pieces will be large enough to be caught by the strainer, preventing any small fragments from entering the system. This helps maintain the functionality and effectiveness of the fire extinguisher by ensuring that only the desired liquid agent flows through the system without any obstruction or contamination.

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50. Wing tanks are

Explanation

The correct answer is "sealed-off parts of the wing structure." Wing tanks are compartments within the wings of an aircraft that are sealed off from the rest of the wing structure. They are used to store fuel and are designed to be airtight and secure. This ensures that the fuel remains contained within the wing and does not leak or pose a safety hazard.

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51. Specks or granules of sediment in fuel that are visible to the naked eye are approximately how many microns or larger?

Explanation

The question asks about the size of specks or granules of sediment in fuel that can be seen with the naked eye. The correct answer is 40 microns because it states that the sediment particles are approximately this size or larger. This means that any specks or granules of sediment in fuel that are visible to the naked eye would be at least 40 microns in size.

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52. The resistance of an object to change its motion is a property of matter called

Explanation

Inertia is the correct answer because it refers to the resistance of an object to change its motion. It is a property of matter that causes an object to resist any change in its state of motion, whether it is at rest or in motion. Inertia is related to an object's mass, where objects with more mass have greater inertia. This property is fundamental to Newton's first law of motion, also known as the law of inertia.

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53. What are the two types of jet engine compressors?

Explanation

The two types of jet engine compressors are centrifugal and axial-flow. Centrifugal compressors use centrifugal force to compress the air, while axial-flow compressors use a series of rotating and stationary blades to compress the air in a linear direction. These two types of compressors are commonly used in jet engines to increase the pressure and density of the incoming air before it enters the combustion chamber.

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54. Engine design helps prevent igniter plug fouling by

Explanation

Directing air around the plug electrode helps prevent igniter plug fouling by ensuring that the electrode remains clean and free from deposits. When air is directed around the electrode, it helps to cool it down and prevent the build-up of carbon and other contaminants that can interfere with the spark and cause fouling. This design feature allows for efficient combustion and reliable ignition in the engine.

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55. On some jet engines, what secures the turbine bucket in place?

Explanation

Lock strips are used to secure the turbine bucket in place on some jet engines. They provide a strong and reliable method of holding the turbine bucket securely, ensuring that it does not move or become dislodged during operation. This is crucial for the safe and efficient functioning of the engine. Screws, cables, and lockwire are not typically used for this purpose.

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56. Jet engine tachometer gauges are calibrated in percent of

Explanation

Jet engine tachometer gauges are calibrated in percent of maximum RPM because this measurement is crucial for monitoring the engine's performance and ensuring it operates within safe limits. The tachometer provides real-time information about the rotational speed of the engine's shaft, allowing pilots and engineers to assess its health and make necessary adjustments. By calibrating the gauge in percent of maximum RPM, it becomes easier to interpret the readings and identify any deviations from the optimal operating range. This helps in preventing engine damage and maintaining efficient and safe aircraft operations.

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57. The ducting for high-pressure/high-temperature air-conditioning is usually made of

Explanation

The ducting for high-pressure/high-temperature air-conditioning is usually made of stainless steel because it is a strong and durable material that can withstand the high pressures and temperatures involved. Stainless steel is also resistant to corrosion, which is important in air-conditioning systems where moisture and condensation can occur. Additionally, stainless steel has good thermal conductivity, allowing for efficient transfer of heat or cold air.

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58. The rotary plug valve can be removed and replaced

Explanation

The correct answer is without draining the fuel lines or tanks. This means that the rotary plug valve can be removed and replaced without the need to empty the fuel lines or tanks beforehand. This is a convenient feature as it saves time and effort in maintenance or repair tasks involving the valve.

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59. What capacitance-type, fuel-indicating system component allows for changes in fuel density?

Explanation

A compensator is a type of capacitance-type, fuel-indicating system component that allows for changes in fuel density. It is designed to adjust the capacitance value based on the density of the fuel, which helps to accurately measure the fuel level. This allows for more precise fuel indication even when the density of the fuel changes, ensuring accurate readings regardless of variations in fuel density.

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60. What indicates lubricant system contamination by dirt and sand?

Explanation

An increase in silicon indicates lubricant system contamination by dirt and sand. Silicon is a common element found in dirt and sand, and its presence in the lubricant system suggests that these contaminants have entered the system.

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61. The crush-type gasket used in aircraft ducting is made of

Explanation

The crush-type gasket used in aircraft ducting is made of a soft aluminum, or fiber and metal mesh. This type of gasket is designed to provide a seal in areas where there is a need for compression and flexibility. The soft aluminum provides a pliable surface that can conform to irregularities in the ducting, while the fiber and metal mesh provide strength and durability. This combination of materials allows the gasket to effectively seal the ducting and prevent leaks.

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62. What aircraft air conditioning system component controls the flow of ram air through the primary heat exchangers?

Explanation

Movable inlet and exit doors control the flow of ram air through the primary heat exchangers in an aircraft air conditioning system. These doors can be adjusted to regulate the amount of air entering and exiting the system, thereby controlling the temperature and pressure of the air flowing through the heat exchangers. By adjusting the position of these doors, the aircraft can maintain the desired temperature in the cabin and ensure efficient cooling of the air.

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63. In a direct current (DC), liquid-level fuel indicating system, what positions the wiper contact on the resistance strip?

Explanation

The correct answer is "The movement of a float in the tanks." In a direct current (DC), liquid-level fuel indicating system, the position of the wiper contact on the resistance strip is determined by the movement of a float in the tanks. As the float rises or falls with the level of the fuel, it adjusts the position of the wiper contact, which in turn changes the resistance and provides an indication of the fuel level.

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64. The air-refueling (A/R) receptacle is operated

Explanation

The air-refueling (A/R) receptacle is operated hydraulically, meaning that hydraulic power is used to physically move and operate the receptacle. However, the control of the receptacle is done electrically, meaning that electrical signals are used to control the movement and operation of the receptacle.

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65. When the turbine wheel absorbs the fuel energy,

Explanation

When the turbine wheel absorbs the fuel energy, a portion of it, specifically 50 percent, is used for accessories. However, the remaining energy is not wasted but rather returns to the compressor. This allows for a more efficient use of the energy and helps in maintaining the overall functioning of the turbine system.

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66. What type of high-pressure/high-temperature ducting does not require a gasket?

Explanation

A compressible flange is a type of high-pressure/high-temperature ducting that does not require a gasket. This type of flange is designed to create a tight seal without the need for additional sealing materials like gaskets. The flange itself is made of a compressible material that can be tightened down to create a secure connection. This eliminates the need for gaskets, reducing the risk of leaks and simplifying the installation process.

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67. The direct current (DC) voltage supplied to the lights in a photoelectric circuit is pulsed at a rate of

Explanation

The correct answer is 10 Hz because in a photoelectric circuit, the direct current (DC) voltage supplied to the lights 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 at a specific frequency allows for precise control of the lights and can be used for various applications such as dimming or flashing.

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68. What type of fuel pump must have a fuel- and vapor-proof housing?

Explanation

A centrifugal pump with an electrically driven, direct current (DC), series-wound motor must have a fuel- and vapor-proof housing because it is used to pump fuel. This type of pump is commonly used in automotive and industrial applications where fuel needs to be transferred. The fuel- and vapor-proof housing ensures that there is no leakage or escape of fuel or vapor, which is important for safety reasons and to prevent any damage to the pump or surrounding equipment.

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69. What kind of centrifugal pump is used when a fuel supply is required during periods of negative gravity conditions?

Explanation

A dual-impeller centrifugal pump is used when a fuel supply is required during periods of negative gravity conditions. This type of pump is designed with two impellers that rotate in opposite directions, allowing it to handle fluids in both directions of flow. This feature makes it suitable for situations where the pump needs to operate effectively in conditions where gravity is not assisting the flow of fuel.

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70. In a jet engine, what meters the fuel for combustion?

Explanation

The fuel control in a jet engine is responsible for metering the fuel for combustion. It regulates the flow of fuel into the engine based on various factors such as engine speed, temperature, and throttle position. By controlling the fuel flow, the fuel control ensures that the engine receives the right amount of fuel for efficient and safe combustion.

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71. Which engine type used a lot during the early years of jet engine design is the most basic turbine engine design?

Explanation

During the early years of jet engine design, the most basic turbine engine design used was the turbojet. Turbojets work by compressing incoming air, mixing it with fuel, and igniting the mixture to produce a high-speed exhaust jet that propels the aircraft forward. This design does not have any additional components, such as a fan or propeller, making it the most basic form of a turbine engine. Turbofan engines, on the other hand, have an additional fan that provides thrust and improves fuel efficiency, making them more advanced than turbojets.

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72. Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the

Explanation

The temperature and pressure in the 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 being taken in by the engine, which affects the temperature and pressure of the bleed air system. The ambient temperature also plays a role as it affects the temperature of the air entering the engine. Therefore, the engine throttle setting and ambient temperature are the factors that determine the temperature and pressure in the bleed air system.

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73. What is the purpose of the engine bleed air (EBA) check valves?

Explanation

The purpose of the engine bleed air (EBA) check valves is to prevent the loss of compressed bleed air. These valves ensure that the air remains contained within the system and does not escape. By preventing the loss of compressed bleed air, the EBA check valves help maintain the efficiency and functionality of the aircraft's systems that rely on this air, such as the air conditioning and pressurization systems.

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74. What prevents fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes?

Explanation

Vent holes prevent fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes. As the aircraft ascends, the air pressure decreases, causing a potential for the ducts to expand. However, the presence of vent holes allows the air to escape, preventing the swelling of the ducts. This ensures that the ducts maintain their shape and functionality even at high altitudes.

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75. What most likely controls the automatic pump shutoff when all fuel is depleted from a fuel tank?

Explanation

Float switches are most likely to control the automatic pump shutoff when all fuel is depleted from a fuel tank. Float switches are devices that consist of a buoyant float connected to an electrical switch. As the fuel level drops, the float also drops and triggers the switch to shut off the pump. This mechanism ensures that the pump does not continue to operate without fuel, preventing damage to the pump and potential safety hazards.

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76. An aircraft taxiing at a constant speed is an example of

Explanation

An aircraft taxiing at a constant speed is an example of Newton's First Law of Motion, also known as the law of inertia. This law states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an external force. In this case, the aircraft is in motion and continues to move at a constant speed due to the forward thrust of the engines and the absence of any opposing forces.

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77. Which of Newton's Laws of Motion is the best description of why an operating jet engine produces forward thrust?

Explanation

The third law of motion, also known as Newton's law of action and reaction, states that for every action, there is an equal and opposite reaction. In the case of an operating jet engine, the forward thrust is produced by the action of expelling high-speed gases backwards. According to Newton's third law, there is an equal and opposite reaction force that propels the jet engine and the aircraft forward. Therefore, the third law of motion is the best description for why an operating jet engine produces forward thrust.

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78. A jet engine derives its name from the fact that

Explanation

A jet engine is named as such because it utilizes an exhaust-gas-driven turbine wheel to power its compressor. This turbine wheel is driven by the force of the exhaust gases, which in turn drives the compressor to draw in and compress air for combustion. This process allows the engine to generate the necessary power and thrust for propulsion.

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79. On an aircraft liquid oxygen (LOX) system, the handle on a manually operated buildup and vent valve is designed to prevent

Explanation

The handle on a manually operated buildup and vent valve is designed to prevent the filler access door from closing in the vent position.

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80. What liquid-agent fire extinguisher container component holds in both the liquid agent and the nitrogen charge?

Explanation

The frangible disc is the component of a liquid-agent fire extinguisher container that holds both the liquid agent and the nitrogen charge. A frangible disc is a thin, easily breakable disc that is designed to rupture when the pressure inside the container exceeds a certain level. This allows the liquid agent and nitrogen charge to be released, effectively extinguishing the fire. The other options, such as squib, bonnet assembly, and rubber O-ring packing, do not perform the same function as the frangible disc in holding both the liquid agent and the nitrogen charge.

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81. A centrifugal-type aircraft fuel pump may be used

Explanation

A centrifugal-type aircraft fuel pump may be used for boost, transfer, or air refueling operations because it is capable of providing the necessary fuel pressure and flow rate required for these operations. This type of pump is designed to handle high volumes of fuel efficiently and is often used in situations where a pump with no moving parts is desired for reliability and durability. It is not used to scavenge remaining fuel in low areas of a fuel tank, as that is typically the function of a different type of pump. Additionally, while the output volume of the pump may vary with its speed, this is not the primary reason for its use in boost, transfer, or air refueling operations.

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82. What air refueling pump components depend on fuel for lubrication?

Explanation

Bearings in an air refueling pump depend on fuel for lubrication. Bearings are mechanical components that support the rotating shafts and reduce friction between moving parts. In this case, the bearings rely on fuel to provide lubrication, ensuring smooth operation and preventing excessive wear and heat generation. Without proper lubrication, the bearings could fail, leading to pump malfunction or damage.

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83. What are the parts of the isobaric section of the cabin pressure regulator?What are the parts of the isobaric section of the cabin pressure regulator?

Explanation

The isobaric section of the cabin pressure regulator consists of an aneroid, spring, and metering valve. The aneroid is a device that measures the pressure and adjusts the valve accordingly. The spring provides the necessary force to maintain the desired pressure level. The metering valve controls the flow of air to maintain a constant pressure inside the cabin. Together, these three components work together to regulate the cabin pressure and ensure a comfortable and safe environment for the passengers.

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84. What is the purpose of the pneumatic relay in a cabin pressurization system?

Explanation

The purpose of the pneumatic relay in a cabin pressurization system is to ensure that both outflow valves operate at the same time. This is important for maintaining the desired cabin pressure and preventing any imbalances between the two valves. The pneumatic relay helps to synchronize the operation of the valves, ensuring that they open and close simultaneously to regulate the flow of air in and out of the cabin. This helps to maintain a stable and controlled pressurized environment inside the cabin for the comfort and safety of the occupants.

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85. The normal connection for thermal switches in a fire warning system is in series with

Explanation

In a fire warning system, the normal connection for thermal switches is in parallel with each other and with the warning light. This means that all the thermal switches are connected together in a parallel circuit, and this entire parallel circuit is connected in parallel with the warning light. When any of the thermal switches detect a rise in temperature, it will close its circuit and activate the warning light. This configuration ensures that even if one of the thermal switches fails or is triggered, the warning light will still be activated.

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86. In a dual-impeller fuel pump what prevents foreign objects from holding the bypass valve open?

Explanation

In a dual-impeller fuel pump, an inlet screen prevents foreign objects from holding the bypass valve open. The inlet screen acts as a filter, preventing any debris or foreign objects from entering the pump and potentially interfering with the bypass valve. By blocking these objects, the inlet screen ensures that the bypass valve can function properly and prevents any unwanted interference or obstruction.

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87. What determines the N2 compressor rotations per minute (RPM) of a dual-spool jet engine compressor?

Explanation

The N2 compressor rotations per minute (RPM) of a dual-spool jet engine compressor is determined by the fuel control. The fuel control regulates the amount of fuel being supplied to the engine, which in turn affects the speed of the compressor. By adjusting the fuel flow, the fuel control can increase or decrease the RPM of the N2 compressor, allowing for optimal engine performance.

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88. The primary function of a hydromechanical fuel control on a jet engine is to

Explanation

The primary function of a hydromechanical fuel control on a jet engine is to meter the fuel, making certain that the engine gets the correct quantity for combustion at all times. This means that the fuel control system regulates the flow of fuel to ensure that the engine receives the appropriate amount of fuel for efficient and safe combustion. This is important in order to maintain optimal engine performance, prevent fuel-related issues such as hot starts, overtemperatures, engine overspeeding, and flameouts, and ensure that the engine operates within its designed parameters.

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89. What jet engine oil pump consists of a gear and rotor within a housing?

Explanation

A gerotor is a type of positive displacement pump that consists of a gear and rotor within a housing. This design allows for efficient and reliable pumping of jet engine oil. The gear and rotor work together to create a seal and generate pressure, ensuring the proper flow of oil throughout the engine. Therefore, the correct answer is Gerotor.

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90. In a gearbox-type starter system, what transmits the torque supplied by the jet fuel starter (JFS) to the engine gearbox?

Explanation

The torque supplied by the jet fuel starter (JFS) is transmitted to the engine gearbox through the power takeoff (PTO) shaft. The PTO shaft serves as a mechanical link between the JFS and the engine gearbox, allowing the torque to be transferred efficiently. This shaft is specifically designed to handle the high torque generated by the JFS and ensure smooth power transmission to the engine gearbox.

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91. What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?

Explanation

The molecular sieve oxygen generating system (MSOGS) concentrator supplies the OXYGEN regulator control panel with 93 percent oxygen-enriched gas. This means that the gas produced by the MSOGS concentrator is 93 percent oxygen, making it suitable for use in medical and aviation applications where a higher concentration of oxygen is required.

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92. What forms the inner and outer surfaces of an annular-type combustion chamber?

Explanation

Interlocking stainless steel bands form the inner and outer surfaces of an annular-type combustion chamber. These bands are designed to fit together tightly, creating a secure and durable structure for the combustion chamber. The use of stainless steel ensures that the chamber is able to withstand high temperatures and pressures without warping or deforming. This design allows for efficient and effective combustion within the chamber, making it an ideal choice for many combustion systems.

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93. A turbofan engine with a bypass ratio of 3:1 is classified as

Explanation

A turbofan engine with a bypass ratio of 3:1 is classified as a medium bypass engine. The bypass ratio refers to the amount of air that bypasses the engine core compared to the amount of air that goes through the core. In this case, for every 3 units of air that bypasses the core, 1 unit goes through the core. This indicates that a significant portion of the air is bypassing the core, but not to the extent of being classified as low or high bypass. Therefore, the engine falls into the medium bypass category.

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94. What form must you fill out and submit to the non-destructive inspections (NDI) laboratory with all oil samples?

Explanation

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95. What engine bleed air (EBA) component prevents loss of air through the engine when it is shutdown

Explanation

The shutoff valve is the engine bleed air (EBA) component that prevents the loss of air through the engine when it is shutdown. This valve is designed to close off the flow of air, preventing any leakage or loss of pressure. By shutting off the valve, the bleed air system is effectively sealed, ensuring that no air escapes from the engine. This is important for maintaining system efficiency and preventing any potential damage or loss of functionality.

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96. As bleed air enters the compressor of the air cycle machine, its pressure is increased. With the increase in pressure, there is also an increase in temperature. Which component removes most of this increased temperature?

Explanation

The secondary heat exchanger removes most of the increased temperature. As the bleed air enters the compressor of the air cycle machine, its pressure is increased, which also leads to an increase in temperature. The primary heat exchanger may remove some heat, but it is the secondary heat exchanger that is primarily responsible for removing most of the increased temperature. It is designed to transfer heat from the bleed air to the outside air, cooling it down before it goes back into the system.

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97. What augmenter component creates local turbulence and reduces gas velocity?

Explanation

A flameholder is an augmenter component that creates local turbulence and reduces gas velocity. It is designed to stabilize the flame in a combustion system by promoting efficient mixing of fuel and air. The turbulence created by the flameholder helps to enhance combustion by increasing the contact between the fuel and air, resulting in better fuel-air mixing and a more stable flame. This reduces the gas velocity and prevents flame blowout, making the flameholder an effective component in combustion systems.

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98. What is the purpose of a front-mounted fan in an axial-flow jet engine compressor?

Explanation

The purpose of a front-mounted fan in an axial-flow jet engine compressor is to increase thrust and send air through the compressor core rotor. The fan blades accelerate the incoming air, increasing the overall thrust of the engine. Additionally, the fan helps to direct the airflow towards the compressor core rotor, which is responsible for compressing the air before it enters the combustion chamber. This ensures efficient combustion and overall engine performance.

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99. The three turbine designs used in jet engines are a. shrouded,

Explanation

The correct answer is impulse, reaction, and reaction-impulse. Jet engines use three different turbine designs: impulse, reaction, and reaction-impulse. The impulse turbine uses the force of high-velocity gas to rotate the turbine blades. The reaction turbine uses the force of gas expanding and changing direction to rotate the blades. The reaction-impulse turbine combines both the impulse and reaction principles to generate rotational motion. These three designs are commonly used in jet engines to efficiently convert the energy of the exhaust gases into mechanical power.

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100. The three methods of transferring fuel are gravity flow,

Explanation

The correct answer is air pressure and pump. This means that the two methods of transferring fuel are using air pressure and using a pump. Air pressure can be used to push the fuel through a system, while a pump can be used to create pressure and move the fuel. These two methods are commonly used in fuel transfer systems to ensure efficient and controlled fuel flow.

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101. What effect does the divergent design of a jet engine diffuser have on pressure?

Explanation

The divergent design of a jet engine diffuser increases pressure. This is because the divergent shape of the diffuser allows the airflow to expand, which in turn slows down the air velocity. As the air slows down, its kinetic energy is converted into pressure energy, resulting in an increase in pressure.

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102. What jet engine alternating current (AC) ignition system unit develops 20,000 volts delivered to the igniter plugs?

Explanation

A transformer is a device that can increase or decrease the voltage of an electrical current. In this case, the jet engine AC ignition system unit requires a voltage of 20,000 volts to be delivered to the igniter plugs. A transformer is capable of stepping up the voltage from a lower value to the required 20,000 volts, making it the correct answer. An inverter, capacitor, and generator are not specifically designed for voltage transformation, so they are not suitable for developing the required voltage for the igniter plugs.

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103. The purpose of the jet engine pressure ratio (EPR) indicating system is to give a reference to the engine's

Explanation

The jet engine pressure ratio (EPR) indicating system is designed to provide a reference for the engine's available thrust output. This means that it helps pilots and engineers determine the amount of thrust the engine is capable of producing at any given time. By monitoring the EPR, they can make adjustments to optimize the engine's performance and ensure that it is operating within safe and efficient parameters. Therefore, the purpose of the EPR indicating system is to provide information about the engine's available thrust output.

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104. What gaseous oxygen (GOX) system valve type prevents a complete loss of oxygen?

Explanation

A check valve is a type of valve that allows the flow of fluid in only one direction. In the case of a gaseous oxygen (GOX) system, a check valve prevents a complete loss of oxygen by ensuring that the flow of oxygen can only go in one direction and cannot flow back. This is important to maintain the integrity and safety of the system, as it prevents oxygen from escaping or leaking out completely.

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105. The air turbine (impingement) starter used on jet engines a.

Explanation

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 more efficient and easier to maintain compared to other types of starters. The reduced weight also helps in improving the overall performance of the jet engine. Additionally, having fewer moving parts reduces the risk of mechanical failures and increases the reliability of the starter.

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106. In a piston-type, fuel level control valve, what aids piston closure and prevents fuel from entering the tank?

Explanation

The spring aids piston closure and prevents fuel from entering the tank in a piston-type, fuel level control valve. It provides the necessary force to keep the piston closed and ensure that fuel does not flow back into the tank. The spring acts as a mechanical barrier, exerting pressure on the piston to maintain a tight seal and prevent any fuel leakage.

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107. One common type of variable-area orifice used on augmenters is the

Explanation

A segmented flap is a common type of variable-area orifice used on augmenters. This type of flap is divided into segments, allowing for greater control and adjustment of the flow area. By adjusting the position of the segments, the area of the orifice can be varied, which in turn affects the flow rate of the fluid passing through it. This type of design is often used in augmenters to optimize performance and achieve desired flow characteristics.

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108. N the variable isobaric pressurization system. the manual control valve is used as an alternate when the

Explanation

In the isobaric pressurization system, the cabin pressure controller is responsible for maintaining the desired cabin pressure. If the cabin pressure controller fails, it means that it is unable to regulate the cabin pressure effectively. In such a situation, the manual control valve is used as an alternate to manually control the cabin pressure. This allows the crew to maintain a safe and comfortable cabin environment in case of a failure in the cabin pressure controller.

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109. A simple direct current (DC) ignition system consists of

Explanation

A simple direct current (DC) ignition system consists of a vibrator, which is responsible for interrupting the current flow and creating the necessary high voltage pulses. The igniter plugs are essential for creating the spark that ignites the fuel-air mixture in the engine. Finally, the transformer is needed to step up the voltage from the battery to a level that can create the spark. Therefore, the correct answer is vibrator, igniter plugs, and transformer.

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110. What are the components of the differential section of the cabin pressure regulator?

Explanation

The components of the differential section of the cabin pressure regulator are a diaphragm, spring, and metering valve. These components work together to regulate the cabin pressure. The diaphragm responds to changes in pressure, the spring provides the necessary force for the diaphragm to function, and the metering valve controls the flow of air to maintain the desired pressure in the cabin.

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111. What rotary plug valve part rotates and seals off the passage of fuel during plug valve removal?

Explanation

The secondary seal sleeve is the part of the rotary plug valve that rotates and seals off the passage of fuel during plug valve removal. It is responsible for preventing any fuel from leaking out when the valve is being removed.

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112. When classified according to structure, which of the following is not a type of an oil pump?

Explanation

The question asks for the type of oil pump that is not classified according to structure. The options provided are gear, gerotor, rotogear, and sliding vane. Gear pumps and sliding vane pumps are both types of oil pumps classified according to structure. Gerotor pumps are also a type of oil pump, consisting of an inner rotor and an outer rotor. However, "rotogear" is not a recognized term or type of oil pump, making it the correct answer as it does not fit the classification mentioned in the question.

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113. What engine component must be rotated to a predetermined speed in order for a jet engine starter to be considered effective?

Explanation

The compressor must be rotated to a predetermined speed in order for a jet engine starter to be considered effective. The compressor plays a crucial role in the jet engine as it compresses incoming air before it enters the combustion chamber. By rotating the compressor to a specific speed, it ensures that there is sufficient air compression and flow, allowing for proper combustion and engine startup. Without an effective compressor rotation, the jet engine may not function optimally or may not start at all.

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114. A pressure-loaded fuel system check valve is used

Explanation

A pressure-loaded fuel system check valve is used when gravity flow through the valve is undesirable. This means that the valve is designed to prevent fuel from flowing back due to gravity, which can cause issues such as fuel leakage or improper fuel distribution. By using a pressure-loaded check valve, the flow of fuel can be controlled and regulated in a way that ensures proper functioning of the fuel system.

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115. What maintains pressure if the dual-differential cabin pressure regulator fails during flight?

Explanation

If the dual-differential cabin pressure regulator fails during flight, the outflow valves will maintain the pressure. The outflow valves are responsible for controlling the flow of air out of the cabin, and they can be manually adjusted to maintain the desired cabin pressure. Therefore, even if the pressure regulator fails, the outflow valves can still be used to regulate the cabin pressure and ensure the safety and comfort of the passengers and crew.

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116. The low-level shutoff valve prevents the reverse flow of fuel through the valve by what type of action?

Explanation

A check valve is designed to allow fluid to flow in only one direction, preventing reverse flow. It uses a mechanical mechanism, such as a ball or a disc, to block the flow when it tries to reverse. In this case, the low-level shutoff valve is specifically designed to prevent the reverse flow of fuel, and a check valve is the most suitable type of valve for this purpose.

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117. The cartridge-pneumatic starter is a gas-driven turbine wheel coupled to the engine through a reduction gear system and

Explanation

The cartridge-pneumatic starter is a gas-driven turbine wheel that needs to be coupled to the engine through a reduction gear system and a power takeoff (PTO) shaft. An overrunning clutch is a mechanism that allows the starter to disengage from the engine once it reaches a certain speed, preventing damage to the starter and the engine. This allows the engine to continue running independently while the starter is disengaged. Therefore, an overrunning clutch is necessary in this system to ensure the safe and efficient operation of the cartridge-pneumatic starter.

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118. Leak limits correspond to the

Explanation

The correct answer is "leak category and fuel type." This means that the limits for leaks are determined by both the category of the leak (such as gas, oil, or water) and the type of fuel being leaked (such as gasoline, diesel, or natural gas). Different types of leaks and fuels may have different limits based on their potential hazards and environmental impact.

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119. In addition to the Air Force Technical Order (AFTO) Form 781A or AFTO Form 781K, what form must you use to document fuel leaks when automatic data systems are not available?

Explanation

When automatic data systems are not available, AFTO Form 427 must be used to document fuel leaks. This form is specifically designed for recording fuel system discrepancies and is used in conjunction with the Air Force Technical Order (AFTO) Form 781A or AFTO Form 781K. It provides a standardized format for documenting and tracking fuel leaks, ensuring that accurate and consistent records are maintained for maintenance and safety purposes.

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120. The exhaust duct connects the turbine outlet and the

Explanation

The exhaust duct connects the turbine outlet and the jet nozzle. The turbine outlet is where the exhaust gases from the turbine are expelled, and the jet nozzle is responsible for accelerating these gases to create thrust. Therefore, the exhaust duct acts as a pathway for the gases to flow from the turbine to the jet nozzle, allowing for the generation of thrust in a jet engine.

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121. The fuel system components that prevent excessive pressure from building up in trapped lines or within the valve body are three

Explanation

Spring-loaded relief valves are fuel system components that prevent excessive pressure from building up in trapped lines or within the valve body. These valves are designed with a spring mechanism that allows them to open and release pressure when it reaches a certain threshold. This helps to protect the fuel system from damage caused by excessive pressure, ensuring safe and efficient operation.

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122. What air refueling pump component removes fuel vapors caused by the centrifugal force of the impellers?

Explanation

The rotor is the air refueling pump component that removes fuel vapors caused by the centrifugal force of the impellers. The impellers generate centrifugal force, which creates fuel vapors. The rotor is responsible for removing these vapors from the pump, ensuring the smooth operation of the refueling process. The stator, accumulator, and vapor relief valve do not have this specific function.

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123. When a jet engine uses two or more turbine wheels, what is placed directly in front of each turbine wheel?

Explanation

The nozzle diaphragm is placed directly in front of each turbine wheel in a jet engine that uses two or more turbine wheels. The nozzle diaphragm helps to direct and control the flow of exhaust gases from the combustion chamber towards the turbine blades, ensuring efficient energy transfer and propulsion.

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124. The three types of shutoff valves used in the crossfeed fuel system are the

Explanation

The correct answer is sliding gate, rotary plug, and disc. These are the three types of shutoff valves used in the crossfeed fuel system. The sliding gate valve is a type of valve that uses a gate mechanism to control the flow of fuel. The rotary plug valve is a type of valve that uses a rotating plug to control the flow of fuel. The disc valve is a type of valve that uses a disc mechanism to control the flow of fuel. These three types of valves are commonly used in crossfeed fuel systems to regulate and control the flow of fuel between different fuel tanks.

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The disadvantage of a continuous-flow oxygen regulator is that it
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In its natural state oxygen is?
"The simultaneous control of temperature, humidity, and air...
The rapid cooling of bleed air causes
The low atmospheric pressure found at extremely high altitudes can...
The ability to do work is the definition of
Air and gases flowing through a jet engine require
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A micron is a metric linear measurement equal toA micron is a metric...
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Liquid oxygen (LOX) converts to gaseous oxygen (GOX) at an expansion...
Bleed air is usually taken from which part of the engine section?
What aircraft air conditioning system component is a radiator that...
What is the basic purpose of the fuel vent system?
Fuel's ability to hold contaminants in suspension is increased with a...
Classification of fuel leaks is necessary in order to determine
What is the purpose of the exhaust duct?
What type of fuel control uses thermocouples, relays, amplifiers, and...
What prevents a fuel tank from collapsing if an air pressure regulator...
The combustion efficiency of a gas turbine is usually between
Fuel that accumulates after a failed start or after engine shutdown is
The purpose of a fuel/oil cooler in a fuel system is to
Except during servicing, the liquid oxygen (LOX) system's combination...
The fire detector, frequently used in fire warning systems, that has a...
Another name for the disc type valve in a fuel system is
Some fuel level control valves have a dual-float system so that
Which type of fuel contaminant can form a red, brown, gray, or black...
Exhaust gas temperature (EGT) indicators indicate the engine EGT in
The three benefits of the Joint Oil Analysis Program (JOAP) are...
Expansion joints in bleed air systems are best used for
What controls the action of the outflow valve in a fixed-isobaric,...
In a liquid-agent fire extinguisher container, why is the frangible...
Wing tanks are
Specks or granules of sediment in fuel that are visible to the naked...
The resistance of an object to change its motion is a property of...
What are the two types of jet engine compressors?
Engine design helps prevent igniter plug fouling by
On some jet engines, what secures the turbine bucket in place?
Jet engine tachometer gauges are calibrated in percent of
The ducting for high-pressure/high-temperature air-conditioning is...
The rotary plug valve can be removed and replaced
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The crush-type gasket used in aircraft ducting is made of
What aircraft air conditioning system component controls the flow of...
In a direct current (DC), liquid-level fuel indicating system, what...
The air-refueling (A/R) receptacle is operated
When the turbine wheel absorbs the fuel energy,
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The direct current (DC) voltage supplied to the lights in a...
What type of fuel pump must have a fuel- and vapor-proof housing?
What kind of centrifugal pump is used when a fuel supply is required...
In a jet engine, what meters the fuel for combustion?
Which engine type used a lot during the early years of jet engine...
Aircraft engine temperature and pressure as it applies to the bleed...
What is the purpose of the engine bleed air (EBA) check valves?
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What most likely controls the automatic pump shutoff when all fuel is...
An aircraft taxiing at a constant speed is an example of
Which of Newton's Laws of Motion is the best description of why an...
A jet engine derives its name from the fact that
On an aircraft liquid oxygen (LOX) system, the handle on a manually...
What liquid-agent fire extinguisher container component holds in both...
A centrifugal-type aircraft fuel pump may be used
What air refueling pump components depend on fuel for lubrication?
What are the parts of the isobaric section of the cabin pressure...
What is the purpose of the pneumatic relay in a cabin pressurization...
The normal connection for thermal switches in a fire warning system is...
In a dual-impeller fuel pump what prevents foreign objects from...
What determines the N2 compressor rotations per minute (RPM) of a...
The primary function of a hydromechanical fuel control on a jet engine...
What jet engine oil pump consists of a gear and rotor within a...
In a gearbox-type starter system, what transmits the torque supplied...
What does the molecular sieve oxygen generating system (MSOGS)...
What forms the inner and outer surfaces of an annular-type combustion...
A turbofan engine with a bypass ratio of 3:1 is classified as
What form must you fill out and submit to the non-destructive...
What engine bleed air (EBA) component prevents loss of air through the...
As bleed air enters the compressor of the air cycle machine, its...
What augmenter component creates local turbulence and reduces gas...
What is the purpose of a front-mounted fan in an axial-flow jet engine...
The three turbine designs used in jet engines are a. shrouded,
The three methods of transferring fuel are gravity flow,
What effect does the divergent design of a jet engine diffuser have on...
What jet engine alternating current (AC) ignition system unit develops...
The purpose of the jet engine pressure ratio (EPR) indicating system...
What gaseous oxygen (GOX) system valve type prevents a complete loss...
The air turbine (impingement) starter used on jet engines a.
In a piston-type, fuel level control valve, what aids piston closure...
One common type of variable-area orifice used on augmenters is the
N the variable isobaric pressurization system. the manual control...
A simple direct current (DC) ignition system consists of
What are the components of the differential section of the cabin...
What rotary plug valve part rotates and seals off the passage of fuel...
When classified according to structure, which of the following is not...
What engine component must be rotated to a predetermined speed in...
A pressure-loaded fuel system check valve is used
What maintains pressure if the dual-differential cabin pressure...
The low-level shutoff valve prevents the reverse flow of fuel through...
The cartridge-pneumatic starter is a gas-driven turbine wheel coupled...
Leak limits correspond to the
In addition to the Air Force Technical Order (AFTO) Form 781A or AFTO...
The exhaust duct connects the turbine outlet and the
The fuel system components that prevent excessive pressure from...
What air refueling pump component removes fuel vapors caused by the...
When a jet engine uses two or more turbine wheels, what is placed...
The three types of shutoff valves used in the crossfeed fuel system...
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