Engine System Components Quiz

In fuel controls that require setting during an engine trim, screws must be safety sealed or lockwired. This is necessary to ensure that the screws do not loosen or move out of position during operation, which could lead to a malfunction or failure of the fuel control system. Safety sealing or lockwiring involves securing the screws in place using a seal or wire, preventing any unintended movement. This provides an added level of safety and ensures the proper functioning of the engine trim system.

The main fuel control is responsible for regulating the fuel flow to the engine, ensuring that it is at the correct level for safe acceleration. By doing so, it prevents a flameout, which is the sudden extinction of the flame in the combustion chamber. A flameout can occur if there is insufficient fuel supply, leading to a loss of power and potentially causing the engine to shut down. Therefore, the main fuel control plays a crucial role in maintaining the engine's stability and preventing flameouts.

The purpose of the fuel oil cooler is to heat the fuel and cool the oil. This is important because fuel needs to be heated in order to achieve proper combustion, while oil needs to be cooled to prevent overheating and maintain its lubricating properties. By performing these functions, the fuel oil cooler ensures efficient and safe operation of the engine.

Aeration is the correct term used to indicate that air is being mixed with the oil in the oil pump to create pockets of air. Aeration occurs when air is introduced into the oil system, which can lead to reduced lubrication and potential damage to the engine or machinery. This can happen due to factors such as foaming, cavitation, or inadequate sealing.

Microscopic metallic particles in the oil system are referred to as wear metals. These particles are generated as a result of friction and wear between moving parts in the system. Over time, these wear metals can cause damage to the components and reduce the efficiency of the system. Therefore, monitoring and controlling the levels of wear metals in the oil system is important for maintaining the performance and longevity of the machinery.

JP8 is a type of jet fuel commonly used by military aircraft. It is a mixture of gasoline and kerosene. Gasoline provides the necessary energy for combustion, while kerosene helps to improve the fuel's stability and performance at high altitudes. This composition allows JP8 to meet the specific requirements of military aircraft, such as high energy density and low freezing point.

The T56 engine fuel nozzle requires a spray pattern inspection in addition to visual inspection. This means that apart from visually inspecting the nozzle, it is also necessary to inspect the spray pattern of the fuel being emitted from the nozzle. This is important to ensure that the fuel is being sprayed evenly and efficiently, as any irregularities in the spray pattern can affect the engine's performance.

Electromagnetic induction refers to the process of generating voltage in a conductor when it moves through a magnetic field. This phenomenon was first discovered by Michael Faraday in the 19th century and is the fundamental principle behind the operation of generators, transformers, and many other electrical devices. It involves the creation of an electric current in a conductor due to the changing magnetic field it experiences, leading to the production of voltage.

The correct answer is both primary and secondary fuel flow passages. This means that the fuel injectors on the F108 engine contain passages for both primary and secondary fuel flow. This is important because primary fuel flow passages deliver fuel directly to the combustion chamber, while secondary fuel flow passages deliver fuel to other parts of the engine for cooling and lubrication purposes. The presence of both types of passages ensures proper fuel distribution and engine performance.

The correct answer is small gas turbine engine. This is because a small gas turbine engine is commonly used as a starter in various applications, including aircraft engines, power generation systems, and industrial machinery. It provides the necessary power to start larger engines or equipment by converting the energy of the combustion process into mechanical energy. Unlike the other options listed, a small gas turbine engine is specifically designed for this purpose and is widely used due to its reliability and efficiency.

Hydroelectromechanical fuel control systems use various components such as thermocouples, relays, amplifiers, and solenoids to regulate and control the fuel flow in a jet engine. These systems combine hydraulic and electromagnetic principles to ensure precise and efficient fuel control. By utilizing these components, the hydroelectromechanical fuel control system can accurately monitor and adjust the fuel flow based on various factors such as engine speed, temperature, and altitude, thereby optimizing the engine's performance.

The AE2100D3 FADEC is supplied with power by the airplane's 28 VDC power supply until the engine RPM is sufficient for the alternator stator to take control. This means that the airplane's power supply is responsible for providing the necessary power to the FADEC system until the engine reaches a certain RPM level, at which point the alternator stator takes over and provides power.

When an engine is not operating, the static preload for a carbon seal is provided by spring pressure. This means that the carbon seal is compressed and held in place by a spring, creating a tight seal between two components. The spring pressure ensures that there is enough force to maintain the seal even when the engine is not running and there is no air pressure, oil pressure, or hydraulic pressure available to provide the preload.

The valve that allows fluid to flow in only one direction is called a check valve. This type of valve is designed to prevent backflow or reverse flow of fluid in a piping system. It opens when the fluid flows in the desired direction and closes automatically to prevent any backward flow. Check valves are commonly used in various applications such as plumbing, irrigation systems, and industrial processes to ensure the proper and controlled flow of fluids.

After the cooling airflow has cooled the turbine section, it is directed into the gas stream to exit the engine. This is because the cooling airflow has already served its purpose of cooling the turbine and is no longer needed in that specific area. Instead, it is released into the gas stream to be expelled from the engine along with the exhaust gases.

The DEEC (Digital Electronic Engine Control) controls the operation of the F100 engine when in primary mode. It is responsible for monitoring and adjusting various engine parameters such as fuel flow, temperature, and pressure. The DEEC uses digital technology to ensure optimal engine performance and efficiency.

The correct answer is deaeration. In an engine oil tank, the deaeration device is responsible for separating air from the oil. This helps to prevent air bubbles from forming in the oil, which can cause issues with lubrication and potentially damage the engine. Deaeration ensures that the oil remains free of air, allowing it to effectively lubricate the engine components.

The DEEC (Digital Electronic Engine Control) component controls the augmentor fuel control on the F100 engine. The DEEC is responsible for monitoring and adjusting various engine parameters, including fuel flow, to optimize engine performance. It receives inputs from sensors and makes real-time adjustments to ensure efficient combustion and power output. Therefore, the DEEC is the correct component that controls the augmentor fuel control.

The correct answer is "2 gear 1 boost". This means that in the T56 engine, there are two gear-type fuel pumps and one boost-type fuel pump. The gear-type pumps are responsible for delivering fuel to the engine, while the boost-type pump increases the fuel pressure to ensure proper fuel flow.

An air oil cooler operates on the same principles as a car radiator. Just like a car radiator, an air oil cooler uses air as the cooling medium to dissipate heat from the oil. It consists of a series of fins or tubes through which the oil flows, and air is forced over these fins or tubes to cool the oil. This process is similar to how a car radiator cools the engine coolant by passing air through its fins. Therefore, the correct answer is air.

The project monitor is responsible for ensuring that the OAP (presumably referring to an Operational Analysis Plan) operates properly. They oversee the progress and execution of the project, monitor its performance, and ensure that it aligns with the objectives and requirements. The project monitor acts as a point of contact for stakeholders, manages risks, and ensures that the project stays on track.

The P&D valve, also known as the Pressure and Drain valve, controls the pressurization of the core engine fuel system. It regulates the fuel pressure within the system to ensure proper fuel flow and delivery to the engine. By maintaining the correct pressure, the P&D valve helps optimize engine performance and fuel efficiency.

High altitude stalls can cause a sudden loss of lift and a rapid descent, resulting in a high-speed impact with the air. This impact can create a loud noise that resembles an explosion. The sudden change in air pressure and the turbulence caused by the stall can contribute to this explosive sound.

The MFC (Main Fuel Control) on the f100 engine is capable of operating in two modes.

The air/oil coolers on an F100 engine are mounted on the fan duct and use secondary fan airflow as a coolant. This means that the coolers are positioned in such a way that they receive air from the secondary fan, which helps in cooling the air and oil in the engine. By utilizing the secondary fan airflow as a coolant, the coolers are able to effectively regulate the temperature of the engine, ensuring optimal performance and preventing overheating.

The correct answer is filter bypass valve. During cold weather starts, the oil in the engine may be too thick to flow through the filter effectively. The filter bypass valve allows the oil to bypass the filter temporarily, ensuring that the engine receives an adequate supply of oil for lubrication and protection. This helps to prevent damage to the engine during cold starts when the oil is not flowing smoothly.

The Journeyman must be aware of the corrosiveness of modern jet engine oil. This is because corrosiveness refers to the ability of a substance to cause damage or deterioration to materials it comes into contact with. In the case of jet engine oil, which is used in high-performance engines, corrosiveness can lead to the degradation of engine components and potentially compromise the safety and performance of the aircraft. Therefore, it is crucial for the Journeyman to understand this hazardous property and take appropriate measures to prevent corrosion and ensure the proper functioning of the engine.

SEM/EDX analysis is a technique used to analyze the composition of particles. Unlike conventional oil analysis, where samples are sent off-site for analysis, SEM/EDX analysis can be performed on-site. However, for accurate analysis to take place, the particles being analyzed must be free of oil. This is because oil can interfere with the analysis and affect the results. Therefore, ensuring that the particles are free of oil is a major aspect of the SEM/EDX analysis process. This allows for accurate and reliable results concerning the condition of equipment and components to be obtained.

In a simple AC generator, the brushes are responsible for taking the current from the slip rings to operate the electrical device. The brushes make contact with the slip rings, which are connected to the rotating loop of wire in the generator. As the loop rotates, it cuts through the magnetic field, inducing an alternating current. The brushes act as conductors, allowing the current to flow from the slip rings to the external circuit, thus powering the electrical device. The commutator, on the other hand, is typically found in DC generators and serves to convert the alternating current to direct current. The rotating loop and permanent magnet are components of the generator itself, not involved in transferring the current.

The correct answer is "filler cap with a graduated gauge." This means that the oil level in a F108 engine can be checked by using a filler cap that has a gauge with graduated markings. This allows the user to visually determine the oil level by observing the position of the gauge on the filler cap.

The commutator is the part of a generator that acts as an automatic switching device, changing alternating current to direct current. It consists of a set of copper bars or segments that are connected to the ends of the armature coil. As the armature rotates, the commutator reverses the direction of the current flowing through the coil, ensuring that the output current is always in the same direction. This conversion from AC to DC is crucial for many applications that require a steady and consistent flow of current in one direction.

The 50 percent engine cutout switch assembly is used to stop the JFS (Jet Fuel Starter) starting cycle when the aircraft engine has accelerated to starter cutout speed. This switch assembly is specifically designed to cut off the fuel flow to the JFS at 50 percent engine speed, ensuring that the JFS is no longer needed once the aircraft engine reaches a certain speed threshold. By cutting off the fuel supply, the switch assembly effectively stops the JFS starting cycle and allows the engine to continue operating independently.

Water takes 4 times longer to settle in JP8 than in gasoline at room temperature.

The correct answer is 13th. In the F100 engine, the augmentor fuel pump is driven by the 13th stage of the compressor. This stage is responsible for providing the necessary power to drive the fuel pump, which is essential for the operation of the augmentor system. The augmentor system is used to increase the thrust of the engine during certain phases of flight, such as takeoff or high-speed maneuvers.

The flap actuator is responsible for regulating the amount of Ram air passing through the oil cooler core. It controls the opening and closing of the flap, which in turn adjusts the airflow. The size of the core and the regulating valve may have an impact on the overall functioning of the oil cooler, but they do not directly regulate the amount of air passing through it. Therefore, the flap actuator is the correct answer.

Identifying an impending failure through OAP (Operational Awareness Program) helps in improving safety by allowing timely intervention and preventive measures. By identifying potential failures beforehand, necessary actions can be taken to mitigate risks and prevent accidents or injuries. This ensures a safer working environment for personnel and minimizes the chances of any hazardous incidents.

The operational control of the F108 engine is achieved by the use of the power lever, fuel shutoff lever, and PMC (Power Management Computer). The PMC is responsible for monitoring and controlling various parameters of the engine, such as fuel flow, thrust, and temperature. It ensures optimal engine performance by adjusting the fuel-air mixture and other variables as necessary. The fuel pump, oil heat exchanger, and air fuel exchanger are important components of the engine but do not directly control its operation like the PMC does.

A dry sump oil system is a type of oil system that stores the oil in a separate tank, typically located outside of the engine. This system uses an external pump to circulate the oil from the tank to the engine, and then returns the oil back to the tank. By separating the oil storage from the engine, a dry sump system allows for better oil control and lubrication, especially in high-performance engines or those with limited space. In contrast, a wet sump system stores the oil directly in the engine's oil pan, while hot and cold tanks are not commonly used in oil systems.

The correct answer is 10%. This means that the intervals at which oil sampling is conducted should not vary by more than 10%. It is important to maintain consistency in oil sampling intervals to ensure accurate and reliable results. If the intervals vary too much, it can lead to inconsistent data and potentially miss important changes or issues in the oil's condition. Therefore, a maximum variation of 10% is recommended to ensure the effectiveness of oil sampling.

The discharge air used for aircraft engine anti-icing to heat critical areas is taken from the compressor. The compressor is responsible for compressing the incoming air and supplying it to the combustion chamber. In this process, the air gets heated, and a portion of this hot air is diverted to heat critical areas of the engine to prevent ice formation.

The anti-icing system on an F110 engine is designed to prevent the formation and build-up of ice on various components, including the front frame struts, forward centerbody, and fan inlet guide vane flaps. These fan inlet guide vane flaps are crucial for controlling the airflow into the engine and ensuring optimal performance. By preventing ice formation on these flaps, the anti-icing system ensures that the engine can operate efficiently and safely, without any disruptions caused by ice build-up.

The correct answer is FADEC. FADEC stands for Full Authority Digital Engine Control, which is an electronic system that continuously monitors the LVDT (Linear Variable Differential Transformer) signal and controls the compressor IGV (Inlet Guide Vane) position. It ensures optimal engine performance by adjusting the IGV position based on the LVDT signal, which helps regulate airflow and maintain engine efficiency.

When the mechanical type blockage thrust reverser is not in use, the doors retract around the engine exhaust cone, typically forming the rear section of the engine nacelle. This means that the doors move back and enclose the engine exhaust cone, providing a streamlined shape to the rear of the engine nacelle.

The correct answer is aerodynamic blockage and mechanical blockage. Thrust reversers are used in aircraft to redirect the thrust produced by the engines forward, helping to slow down the aircraft during landing. Aerodynamic blockage reversers work by blocking the exhaust flow and redirecting it forward, while mechanical blockage reversers physically block the exhaust flow using doors or buckets. Both types of reversers are commonly used in different aircraft models to achieve effective thrust reversal.

The breather pressurizing valve on the F100 engine is internally mounted in the gearbox. This means that the valve is located within the gearbox itself. The purpose of the breather pressurizing valve is to regulate the pressure inside the gearbox, ensuring that it remains at the appropriate level. By being internally mounted, the valve can effectively control the pressure within the gearbox, which is important for the proper functioning and performance of the engine.

The correct answer is 2 because the question asks for the number of scavange oil pumps located in the RGB. The given answer indicates that there are two such pumps present in the RGB.

The correct answer is "ground start." Ground start is the switch on the T56 engine that energizes the starter control valve to the OPEN position. This switch is responsible for initiating the starting process of the engine by allowing fuel and air to enter the combustion chamber. It is called "ground start" because it is typically used when the aircraft is on the ground and not in flight.

The correct answer is torch igniter and pilot burner. These are the two main types of augmentor ignition systems. A torch igniter is a device that generates a continuous flame, while a pilot burner is a smaller flame that is used to ignite the main burner. Both of these components are essential for the ignition process in augmentor systems.

The hot tank oil system design places the oil cooler in the pressure subsystem. This means that the oil cooler is located within the high-pressure area of the system, allowing it to cool the oil as it flows under pressure. This design helps to maintain optimal oil temperature and prevent overheating of the system. In contrast, the other options (wet tank, dry tank, and cold tank) do not specifically place the oil cooler in the pressure subsystem.

The correct answer is "Gear". In the T56 engine, a gear oil pump is used. This type of oil pump utilizes gears to create suction and pressure, effectively circulating the oil throughout the engine. Gear oil pumps are commonly used in automotive engines due to their reliability and efficiency in delivering oil to the various components that require lubrication.