2A651 Edition 2 Vol.3 Ure

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  • 1/100 Questions

    (401) What is the composition of JP–8 fuel?

    • Gasoline and kerosene.
    • Gasoline and diesel fuel.
    • Diesel fuel and kerosene.
    • Diesel fuel and aviation gasoline.
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2A651 Edition 2 Vol.3 Ure - Quiz
About This Quiz

This quiz, titled '2a651 Edition 2 VOL. 3 URE', assesses knowledge on fuel systems in military aircraft, focusing on the properties and handling of JP-8 fuel, jet engine fuel controls, and fuel system maintenance. It is crucial for aerospace maintenance and safety.

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  • 2. 

    (402) The purpose of a fuel/oil cooler in a fuel system is to

    • Heat the fuel and cool the oil

    • Cool the fuel and cool the oil.

    • Heat the fuel and heat the oil.

    • Cool the fuel and heat the oil.

    Correct Answer
    A. Heat the fuel and cool the oil
    Explanation
    The purpose of a fuel/oil cooler in a fuel system is to regulate the temperature of both the fuel and the oil. It heats the fuel to a desired temperature and cools the oil to prevent it from overheating. This helps to optimize the performance and efficiency of the fuel system by ensuring that the fuel is at the right temperature for combustion and the oil is kept cool to prevent degradation.

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  • 3. 

    (402) The main fuel control allows the jet engine to safely accelerate, reducing the possibility of

    • Flameout.

    • Turbine seizure.

    • Compressor shift.

    • Overtemperature.

    Correct Answer
    A. Flameout.
    Explanation
    The main fuel control is responsible for regulating the fuel flow to the jet engine. By properly controlling the fuel flow, it ensures that the engine operates within safe parameters and prevents flameout. Flameout refers to the sudden extinguishing of the flame in the combustion chamber, which can occur if the fuel supply is not properly maintained. Therefore, the main fuel control plays a crucial role in preventing flameout and ensuring the safe acceleration of the jet engine.

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  • 4. 

    (406) Use extreme care when working with labyrinth seals because of their

    • Soft metal construction; these seals can be damaged easily.

    • Soft metal construction; they are sharp and can cut your hand.

    • Hard metal construction; they are sharp and can cut your hand.

    • Hard metal construction; these seals can damage the bearing races.

    Correct Answer
    A. Soft metal construction; these seals can be damaged easily.
    Explanation
    Labyrinth seals are constructed with soft metal, which makes them vulnerable to damage. This is why extreme care is needed when working with them. The soft metal construction of these seals increases the risk of them being easily damaged.

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  • 5. 

    (406) Which type of oil pump consists of a gear and rotor within a housing?

    • Gear.

    • Gerotor.

    • Rotogear.

    • Sliding vane.

    Correct Answer
    A. Gerotor.
    Explanation
    A gerotor oil pump consists of a gear and rotor within a housing. This type of pump uses the interaction between the gear and rotor to create a pumping action, drawing in and pushing out oil. The gear and rotor have specially shaped lobes that allow for smooth movement and efficient oil flow. Gerotor pumps are commonly used in automotive engines and other machinery that require a reliable and efficient oil circulation system.

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  • 6. 

    (403) What type of fuel control uses items such as thermocouples, relays, amplifiers, and solenoids to help control a jet engine?

    • Pneumatic.

    • Fuel injection.

    • Hydromechanical.

    • Electrohydromechanical.

    Correct Answer
    A. Electrohydromechanical.
    Explanation
    Electrohydromechanical fuel control uses various components such as thermocouples, relays, amplifiers, and solenoids to regulate and control the fuel flow in a jet engine. These components work together to monitor and adjust the fuel mixture based on various factors such as temperature, pressure, and engine performance. This type of fuel control system combines electrical, hydraulic, and mechanical elements to ensure efficient and precise fuel delivery, resulting in optimal engine performance.

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  • 7. 

    (404) When in the primary mode, what controls the operation of the F100-PW–220 engine?

    • MEC.

    • PMG.

    • TSFC.

    • DEEC.

    Correct Answer
    A. DEEC.
    Explanation
    In the primary mode, the operation of the F100-PW-220 engine is controlled by the DEEC.

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  • 8. 

    (412) What is the term for the process of producing voltage in a conductor when it passes through a magnetic field?

    • Static.

    • Electronics.

    • Mutual induction.

    • Electromagnetic induction.

    Correct Answer
    A. Electromagnetic induction.
    Explanation
    Electromagnetic induction is the correct answer because it refers to the process of generating voltage in a conductor when it moves through a magnetic field. This phenomenon was discovered by Michael Faraday in the 19th century and is the basis for the operation of generators and transformers. It is a fundamental concept in electromagnetism and plays a crucial role in various electrical devices and systems.

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  • 9. 

    (403) Calibration and/or adjustment screws that require setting during an engine trim procedure must be

    • Replaced.

    • Die marked.

    • Safety sealed and/or lockwired.

    • Applied a thread locking compound.

    Correct Answer
    A. Safety sealed and/or lockwired.
    Explanation
    Calibration and/or adjustment screws that require setting during an engine trim procedure must be safety sealed and/or lockwired. This is because safety sealing and lockwiring ensure that the screws remain in their set position and prevent any unintended adjustments or tampering. By using safety seals and lockwires, the screws are secured and cannot be easily moved or altered, ensuring the accuracy and reliability of the engine trim procedure.

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  • 10. 

    (405) In addition to the visual inspection, what other type of inspection does the T–56 engine fuel nozzle require?

    • Nondestructive.

    • Spray pattern.

    • Pre-torque.

    • Ultrasonic.

    Correct Answer
    A. Spray pattern.
    Explanation
    The T-56 engine fuel nozzle requires a spray pattern inspection in addition to the visual inspection. This means that apart from visually inspecting the nozzle, it is also necessary to check the pattern of the fuel spray it produces. This is important to ensure that the fuel is being distributed evenly and properly for efficient combustion and engine performance.

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  • 11. 

    (411) Under what condition would you not receive an OAP laboratory sample report?

    • The sample is the first taken after an oil change.

    • The aircraft is on TDY.

    • It was a special oil sample.

    • The results are normal.

    Correct Answer
    A. The results are normal.
    Explanation
    If the results of the laboratory sample are normal, it means that there are no abnormalities or issues with the oil being tested. In such cases, there may not be a need to receive a laboratory sample report as everything is functioning as expected.

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  • 12. 

    (401) Jet aircraft operating at moderately high altitudes increase the fuel system’s susceptibility to an icing condition, further aggravated by the

    • Lower viscosity of jet fuels.

    • Higher viscosity of jet fuels.

    • Lower viscosity of free water.

    • Higher viscosity of free water.

    Correct Answer
    A. Higher viscosity of jet fuels.
    Explanation
    Jet aircraft operating at moderately high altitudes increase the fuel system's susceptibility to an icing condition. This is because at higher altitudes, the air temperature is colder, which can cause moisture in the fuel system to freeze and form ice. The viscosity of a liquid refers to its resistance to flow. Jet fuels have a lower viscosity, meaning they flow more easily, compared to free water. Therefore, the lower viscosity of jet fuels can make it easier for ice to form and accumulate in the fuel system, increasing the risk of icing.

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  • 13. 

    (406) What type of oil seal has soft metal as its basic composition and allows a small amount of airflow to prevent oil seepage?

    • Silicone.

    • Carbon.

    • Synthetic.

    • Labyrinth.

    Correct Answer
    A. Labyrinth.
    Explanation
    A labyrinth oil seal is made of soft metal and allows a small amount of airflow to prevent oil seepage. This type of seal has a complex design with multiple grooves and barriers that create a tortuous path for the oil, preventing it from leaking out. The soft metal composition allows for flexibility and a better seal against the rotating shaft.

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  • 14. 

    (410) The hazardous property of modern jet engine oil the journeyman must be aware of is

    • Toxicity.

    • Viscosity.

    • Alkalinity.

    • Corrosiveness.

    Correct Answer
    A. Corrosiveness.
    Explanation
    The correct answer is corrosiveness. Modern jet engine oil can be corrosive, meaning it has the ability to cause damage or deterioration to metal surfaces it comes into contact with. This is an important property for a journeyman to be aware of, as it can affect the maintenance and safety of the engine.

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  • 15. 

    (402) During a visual inspection, how can you tell when a fuel filter is clogged?

    • A green flag pops out of the filter

    • Fuel pressure from the fuel pump is low.

    • A differential pressure indicator is actuated

    • There is no way to tell without disassembling the filter.

    Correct Answer
    A. A differential pressure indicator is actuated
    Explanation
    When a fuel filter is clogged, a differential pressure indicator is actuated. This means that there is a mechanism in the fuel filter that detects the pressure difference between the input and output sides of the filter. When the pressure difference exceeds a certain threshold, the indicator is triggered, indicating that the filter is clogged and needs to be replaced. This allows for easy visual inspection without the need to disassemble the filter.

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  • 16. 

    (411) What are microscopic metallic particles in the oil system called?

    • Wear metals.

    • Friction metals.

    • Precious metals.

    • Transformation metals.

    Correct Answer
    A. Wear metals.
    Explanation
    Microscopic metallic particles in the oil system are called wear metals. These particles are generated as a result of friction and wear between moving parts in the system. They are small enough to be suspended in the oil and can cause damage to the system if not properly managed. Regular oil analysis is conducted to monitor the levels of wear metals and detect any potential issues or abnormalities in the system.

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  • 17. 

    (411) Before taking an oil sample from a drain, drain enough fluid into a container in order to

    • Check for large particles.

    • Check the drain operation.

    • Drain off uncirculated oil.

    • Drain off water and sludge.

    Correct Answer
    A. Drain off water and sludge.
    Explanation
    Before taking an oil sample from a drain, it is necessary to drain off water and sludge. This is important because water and sludge can contaminate the oil sample and affect the accuracy of the analysis. By draining off water and sludge, the oil sample will be more representative of the actual condition of the oil, allowing for a more accurate assessment of its quality and any potential issues.

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  • 18. 

    (412) On a simple AC generator, which item takes the current from the slip rings to operate the electrical device?

    • Brushes.

    • Commutator.

    • Rotating loop.

    • Permanent magnet.

    Correct Answer
    A. Brushes.
    Explanation
    The correct answer is "Brushes." 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, the brushes maintain contact with the slip rings, allowing the current to flow from the generator to the electrical device. The commutator is used in DC generators, not AC generators, to change the direction of the current. The rotating loop and permanent magnet are components of the generator but do not directly take the current to operate the electrical device.

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  • 19. 

    (421) Discharge air used for aircraft engine anti-icing to heat-critical areas is taken from which engine area?

    • Compressor.

    • Combustion.

    • Augmentor.

    • Turbine.

    Correct Answer
    A. Compressor.
    Explanation
    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. By using the discharge air from the compressor, which is already at a high temperature, it can be directed to heat-critical areas to prevent ice formation and ensure proper functioning of the aircraft engine.

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  • 20. 

    (405) On the T56 engine, how many and what type of fuel pumps are contained in the fuel pump and filter assembly?

    • 3 gear; 1 boost.

    • 2 gear; 2 boost.

    • 2 gear; 1 boost.

    • 1 gear; 2 boost.

    Correct Answer
    A. 2 gear; 1 boost.
    Explanation
    The T56 engine contains 2 gear fuel pumps and 1 boost fuel pump in the fuel pump and filter assembly.

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  • 21. 

    (430) What is the basic function of an augmentor (afterburner) when it is not operating?

    • Act as the basic engine tailpipe.

    • Control engine discharge pressure.

    • Aid in control of engine oil pressure.

    • Help to control pressure and N2 speed.

    Correct Answer
    A. Act as the basic engine tailpipe.
    Explanation
    When an augmentor (afterburner) is not operating, its basic function is to act as the basic engine tailpipe. This means that it serves as the outlet for the exhaust gases produced by the engine. The augmentor does not have any additional functions or controls when it is not in use.

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  • 22. 

    (407) In an engine oil tank, which device separates the air from the oil?

    • Aerator.

    • Deaerator.

    • Check valve.

    • Bypass valve.

    Correct Answer
    A. Deaerator.
    Explanation
    A deaerator is a device used to remove air and other dissolved gases from the oil in an engine oil tank. It works by heating the oil and then passing it through a series of trays or baffles, where the air is separated and vented out. This helps to prevent air pockets or bubbles from forming in the oil, which can cause damage to the engine and reduce its efficiency. Therefore, a deaerator is the correct device for separating air from the oil in an engine oil tank.

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  • 23. 

    (408) On an F100-PW–220 engine, the air/oil coolers are mounted on the fan duct and use

    • Secondary fan airflow as a coolant.

    • Secondary fan airflow as an oil heater.

    • Primary core engine airflow as a coolant.

    • Primary core engine airflow as an oil heater.

    Correct Answer
    A. Secondary fan airflow as a coolant.
    Explanation
    The air/oil coolers on an F100-PW-220 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 the airflow generated by the secondary fan, which helps to cool the oil in the engine. This is an important function as it helps to regulate the temperature of the oil, ensuring that it does not become too hot and cause damage to the engine components.

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  • 24. 

    (412) Which part of a generator acts as an automatic switching device, changing alternating current to direct current?

    • Brushes.

    • Slip rings.

    • Commutator.

    • Permanent magnet.

    Correct Answer
    A. Commutator.
    Explanation
    The commutator is a part of a generator that acts as an automatic switching device. It is responsible for converting the alternating current produced by the generator into direct current. The commutator consists of a set of copper segments that are connected to the ends of the armature coil. As the armature rotates, the brushes make contact with different segments of the commutator, allowing the current to flow in the desired direction. This switching action ensures that the generated current is always direct current.

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  • 25. 

    (401) At room temperature, how many times longer will it take water to settle out of JP–8 than out of gasoline?

    • Two

    • Three

    • Four

    • Five

    Correct Answer
    A. Four
    Explanation
    At room temperature, it will take water four times longer to settle out of JP-8 than out of gasoline.

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  • 26. 

    (403) Which term describes a jet engine fuel metering device that is really two fuel controls in one component?

    • Unified.

    • Combined.

    • Bimechanical.

    • Electrosecondary.

    Correct Answer
    A. Unified.
    Explanation
    A unified fuel metering device refers to a jet engine component that combines two separate fuel controls into one. This means that instead of having two separate controls for fuel metering, a unified device integrates both controls into a single unit. This helps to simplify the fuel system and improve efficiency by reducing the number of components needed.

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  • 27. 

    (406) Which type of oil cooler operates on the same principle as a radiator in an automobile?

    • Air.

    • Fuel.

    • Hydraulic.

    • Pneumatic.

    Correct Answer
    A. Air.
    Explanation
    An air oil cooler operates on the same principle as a radiator in an automobile. Both the radiator and the air oil cooler use air to cool down the fluid passing through them. In the case of a radiator, air is used to cool down the engine coolant, while in an air oil cooler, air is used to cool down the oil. The air oil cooler consists of fins that help in dissipating heat from the oil as it passes through the cooler, similar to how the radiator fins help in cooling down the engine coolant.

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  • 28. 

    (411) The SEM/EDX analysis process differs from conventional oil analysis in that the SEM/EDX

    • Samples must be sent off-site for analysis.

    • Particles must be oil free for analysis to take place.

    • Samples can only be obtained in an intermediate maintenance shop.

    • Provides results only concerning equipment and components condition.

    Correct Answer
    A. Particles must be oil free for analysis to take place.
    Explanation
    The SEM/EDX analysis process requires the particles to be oil free in order to obtain accurate results. This is because the analysis is focused on examining the composition and elemental makeup of the particles, which can be affected or obscured by the presence of oil. Therefore, it is necessary to ensure that the particles are free from oil before conducting the analysis.

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  • 29. 

    (404) On an F100-PW–220 engine, the DEEC is cooled by

    • Oil

    • Fuel

    • Ram air

    • Hydraulic fluid

    Correct Answer
    A. Fuel
    Explanation
    The DEEC (Digital Electronic Engine Control) on an F100-PW-220 engine is cooled by fuel. This means that fuel is used to regulate the temperature of the DEEC, preventing it from overheating. The fuel flows through the DEEC, absorbing heat and carrying it away, thus keeping the electronic control system at a safe operating temperature. This cooling mechanism ensures the proper functioning and longevity of the DEEC in the engine.

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  • 30. 

    (404) Which F100-PW–220 engine fuel system component controls pressurization of the core engine fuel system?

    • Fuel nozzle.

    • P&D valve.

    • N2 sensor.

    • Tt 2.5 sensor.

    Correct Answer
    A. P&D valve.
    Explanation
    The P&D valve controls the pressurization of the core engine fuel system. It regulates the flow of fuel to maintain the desired fuel pressure in the core. The fuel nozzle, N2 sensor, and Tt 2.5 sensor are not directly responsible for controlling the pressurization of the core engine fuel system.

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  • 31. 

    (404) Which stage of compressor air drives the augmenter fuel pump on an F100-PW–220 engine?

    • 7th

    • 10th

    • 13th

    • 14th

    Correct Answer
    A. 13th
    Explanation
    The augmenter fuel pump on an F100-PW-220 engine is driven by the 13th stage of compressor air.

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  • 32. 

    (405) The temperature datum system static check must be made whenever which component has been replaced?

    • Compressor.

    • Power section.

    • Torquemeter shaft.

    • Reduction gearbox.

    Correct Answer
    A. Power section.
    Explanation
    The temperature datum system static check must be made whenever the power section component has been replaced.

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  • 33. 

    (406) When an engine is not operating, static preload for a carbon oil seal is provided by

    • Air pressure.

    • Oil pressure.

    • Spring pressure.

    • Hydraulic pressure.

    Correct Answer
    A. Spring pressure.
    Explanation
    When an engine is not operating, the static preload for a carbon oil seal is provided by spring pressure. This means that the spring exerts a force on the oil seal, ensuring that it remains in contact with the shaft and prevents any leakage of oil. The spring pressure helps to maintain a tight seal even when there is no oil or hydraulic pressure present.

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  • 34. 

    (408) On an F100 engine, the breather pressurizing valve is internally mounted in the

    • Oil tank.

    • Gearbox.

    • Oil filter.

    • Oil pump.

    Correct Answer
    A. Gearbox.
    Explanation
    The correct answer is gearbox. The breather pressurizing valve on an F100 engine is internally mounted in the gearbox. This valve helps to maintain the proper pressure within the gearbox by regulating the flow of air. It prevents the gearbox from becoming over-pressurized, which can cause damage to the system. By being internally mounted, the valve is able to effectively control the pressure within the gearbox and ensure optimal performance of the engine.

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  • 35. 

    (408) If the red button on an F100-PW–220 engine oil filter pops out and remains extended, the

    • Button is defective.

    • Scheduled oil change is due.

    • Design ambient pressure has been exceeded.

    • Design pressure differential has been exceeded.

    Correct Answer
    A. Design pressure differential has been exceeded.
    Explanation
    The correct answer is "design pressure differential has been exceeded." This means that the pressure difference between the inlet and outlet of the oil filter has exceeded the maximum limit set by the design. When this happens, the red button on the engine oil filter pops out and remains extended, indicating that there is a problem with the pressure in the filter. This is a safety feature to alert the operator that the filter needs attention and should be replaced.

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  • 36. 

    (408) On an F100-PW–220 engine, what component permits oil to bypass the oil filter during cold weather starts?

    • Oil relief valve.

    • Filter poppet valve.

    • Oil pressure transmitter tap.

    • Filter assembly bypass valve.

    Correct Answer
    A. Filter assembly bypass valve.
    Explanation
    The correct answer is the Filter assembly bypass valve. During cold weather starts, the oil filter can become clogged or restricted, which can cause a decrease in oil pressure. The filter assembly bypass valve allows oil to bypass the filter and flow directly to the engine, ensuring that there is sufficient lubrication even if the filter is not fully functional.

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  • 37. 

    (423) On an F110-GE–129 engine, the anti-icing system prevents detrimental formation and accumulation of ice on front frame struts, forward centerbody, and

    • Ring cowl.

    • Fan inlet guide vane flaps.

    • Variable exhaust nozzle flaps.

    • C-D duct.

    Correct Answer
    A. Fan inlet guide vane flaps.
    Explanation
    The correct answer is fan inlet guide vane flaps. On an F110-GE-129 engine, the anti-icing system is responsible for preventing the detrimental formation and accumulation of ice on various parts. In this case, it specifically prevents ice from forming on the fan inlet guide vane flaps. These flaps are located at the front of the engine and play a crucial role in directing the airflow into the engine. It is important to keep them ice-free to ensure proper engine performance and prevent any potential damage caused by ice buildup.

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  • 38. 

    (424) What law does the C-D supersonic inlet use to slow down the airflow?

    • Ohm’s law.

    • Bernoulli’s law.

    • Newton’s first law.

    • Newton’s third law.

    Correct Answer
    A. Bernoulli’s law.
    Explanation
    The C-D supersonic inlet uses Bernoulli's law to slow down the airflow. According to Bernoulli's principle, as the speed of a fluid increases, its pressure decreases. In the case of the C-D supersonic inlet, the airflow is slowed down by increasing its pressure. This is achieved by using a converging-diverging nozzle design, which causes the airflow to accelerate initially and then decelerate, resulting in a decrease in velocity and an increase in pressure.

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  • 39. 

    (428) What is the purpose of jet engine thrust reversers?

    • Direct engine thrust in a rearward direction.

    • Direct engine thrust upward during landing.

    • Direct engine thrust in the opposite direction.

    • Provide directional control of the aircraft on the ground.

    Correct Answer
    A. Direct engine thrust in the opposite direction.
    Explanation
    Jet engine thrust reversers are used to direct engine thrust in the opposite direction. This is typically done during landing to help slow down the aircraft by redirecting the engine's exhaust flow forward. By creating a reverse thrust, the aircraft's forward momentum is reduced, allowing for shorter landing distances and improved braking efficiency. This helps to enhance the safety and control of the aircraft during landing operations.

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  • 40. 

    (409) The AE2100D3 oil tank pendulum is designed to supply pressurized oil for approximately how long during negative G conditions?

    • Minimum of 10 seconds.

    • Minimum of 20 seconds

    • Maximum of 10 seconds.

    • Maximum of 20 seconds.

    Correct Answer
    A. Minimum of 10 seconds.
    Explanation
    The AE2100D3 oil tank pendulum is designed to supply pressurized oil for a minimum of 10 seconds during negative G conditions. This means that even under extreme conditions, the oil tank pendulum is capable of providing a continuous supply of pressurized oil for at least 10 seconds, ensuring the proper functioning of the system during negative G maneuvers.

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  • 41. 

    (411) The primary benefit of identifying an impending failure through the OAP is

    • Improved safety.

    • Increased component life.

    • Reduced maintenance cost.

    • Increased equipment availability.

    Correct Answer
    A. Improved safety.
    Explanation
    The primary benefit of identifying an impending failure through the OAP is improved safety. By detecting potential failures before they occur, proactive measures can be taken to prevent accidents or incidents that could compromise the safety of personnel or equipment. This allows for timely repairs or replacements to be made, reducing the risk of catastrophic failures and ensuring a safer working environment.

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  • 42. 

    (419) What engine section houses the JFS combustion section?

    • Geartrain

    • Turbine plenum.

    • Generator control unit.

    • Gas generator and accessory drive assembly.

    Correct Answer
    A. Turbine plenum.
    Explanation
    The turbine plenum is the engine section that houses the JFS (Jet Fuel Starter) combustion section. The JFS is responsible for providing the initial rotation to start the engine. The turbine plenum is a part of the engine where the combustion gases from the JFS are directed and controlled before entering the main turbine section. It helps to regulate the flow of gases and ensure efficient combustion and power generation in the engine.

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  • 43. 

    (425) Once the cooling airflow has done its job of cooling the turbine section, where does it go?

    • Through a heat exchanger.

    • Out the turbine case bleed holes.

    • Into the gas stream to exit the engine.

    • Back to the compressor to be used again.

    Correct Answer
    A. Into the gas stream to exit the engine.
    Explanation
    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 section and is no longer needed. By directing it into the gas stream, it can be expelled from the engine along with the exhaust gases. This ensures that the cooling airflow does not interfere with the operation of the engine and allows for efficient functioning of the turbine section.

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  • 44. 

    (407) Which type of oil system stores the oil in a tank fitted to the side of the engine?

    • Dry sump.

    • Wet sump.

    • Cold tank.

    • Hot tank.

    Correct Answer
    A. Dry sump.
    Explanation
    A dry sump oil system stores the oil in a separate tank that is mounted to the side of the engine. This design allows for better lubrication and cooling of the engine, as the oil is not stored in the engine's crankcase like in a wet sump system. The separate tank also prevents oil starvation during high-speed or high-g cornering situations, as it can provide a constant supply of oil to the engine. Therefore, the correct answer is dry sump.

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  • 45. 

    (405) When the null orifice on the T56 engine TD valve is set at zero, how much fuel will the valve bypass?

    • 0%.

    • 10%.

    • 20%.

    • 30%.

    Correct Answer
    A. 20%.
    Explanation
    When the null orifice on the T56 engine TD valve is set at zero, it means that the valve is completely closed. In this position, no fuel will bypass the valve, resulting in a bypass percentage of 0%. Therefore, the correct answer is 0%.

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  • 46. 

    (406) Chip detectors have an electrical connection for making which type of check?

    • AC high-voltage.

    • DC high-voltage.

    • Continuity.

    • Polarity.

    Correct Answer
    A. Continuity.
    Explanation
    Chip detectors have an electrical connection for making a continuity check. This means that they are used to check if there is a continuous electrical path between two points in a circuit. In the context of chip detectors, this check is important to ensure that the electrical connection between the chip detector and the system it is monitoring is intact. By confirming continuity, the chip detector can effectively detect any potential issues or abnormalities in the system.

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  • 47. 

    (407) Which type of oil system design places the oil cooler in the pressure subsystem?

    • Cold tank.

    • Wet tank.

    • Dry tank.

    • Hot tank.

    Correct Answer
    A. Hot tank.
    Explanation
    A hot tank oil system design places the oil cooler in the pressure subsystem. This means that the oil cooler is located in a part of the system where the oil is under pressure. The purpose of the oil cooler is to cool the oil and prevent it from overheating. By placing it in the pressure subsystem, the cooler can effectively remove heat from the oil as it flows through the system under pressure. This design helps to maintain the oil at the proper temperature and prevent any damage or degradation that could occur from excessive heat.

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  • 48. 

    (416) The T56 engine speed-sensitive control, measured in RPM, lets electrical current flow to the fuel and ignition system at

    • 16% RPM.

    • 30% RPM.

    • 65% RPM.

    • 94% RPM.

    Correct Answer
    A. 16% RPM.
    Explanation
    The T56 engine speed-sensitive control allows electrical current to flow to the fuel and ignition system at 16% RPM. This means that when the engine is running at 16% of its maximum RPM, the control system will activate and allow the necessary electrical current to power the fuel and ignition system. This control helps to ensure that the engine functions properly and efficiently at different RPM levels.

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  • 49. 

    (405) On the T56 engine, what compares the desired throttle setting from the coordinator with the actual TIT signal from the thermocouples?

    • TD valve.

    • Speed-sensitive control.

    • TD potentiometers.

    • TD amplifier.

    Correct Answer
    A. TD amplifier.
    Explanation
    The TD amplifier on the T56 engine compares the desired throttle setting from the coordinator with the actual TIT (turbine inlet temperature) signal from the thermocouples. It is responsible for regulating the fuel flow to maintain the desired TIT level. The TD valve, speed-sensitive control, and TD potentiometers are not directly involved in this comparison process.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 02, 2012
    Quiz Created by
    Kc10
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