5 Level Volume 3

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  • 1/111 Questions

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

    • MEC
    • PMG.
    • TSFC.
    • DEEC.
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About This Quiz

Explore the intricacies of jet fuel management in '5 Level Volume 3'. This quiz assesses knowledge on JP-8 fuel composition, its behavior under different conditions, and crucial aspects of fuel control in jet engines. Essential for learners in aerospace and mechanical engineering.

5 Level Volume 3 - Quiz

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  • 2. 

    (428) The F100 engine augmentor’s primary nozzle actuator is driven by cables from the

    • T5 amplifier.

    • Unified control.

    • Afterburner fuel control.

    • CENC

    Correct Answer
    A. CENC
    Explanation
    The F100 engine augmentor's primary nozzle actuator is driven by cables from the CENC.

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  • 3. 

     (405) 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 made of soft metal, which makes them susceptible to damage. Due to their delicate construction, they can be easily damaged during handling or installation. Therefore, extreme care should be taken when working with labyrinth seals to avoid any potential damage.

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  • 4. 

     (406) What term is used to indicate that air is being mixed with the oil in the oil pump to create pockets of air?

    • Aeration.

    • Induction.

    • Convection.

    • Compression.

    Correct Answer
    A. Aeration.
    Explanation
    Aeration is the term used to indicate that air is being mixed with the oil in the oil pump to create pockets of air. This can occur when there is excessive turbulence or agitation in the oil, causing air to become trapped in the oil. Aeration can lead to reduced lubrication effectiveness and potential damage to the engine or equipment. Induction refers to the process of drawing air or fuel mixture into the engine's combustion chamber. Convection is the transfer of heat through a fluid medium, and compression is the process of reducing the volume of a gas.

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  • 5. 

     (409) 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 machinery. They can be indicative of the condition of the equipment and can help in diagnosing potential issues or problems. By analyzing the concentration and types of wear metals present in the oil, maintenance personnel can determine the health and performance of the machinery.

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  • 6. 

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

    • Static.

    • Electronics.

    • Mutual induction.

    • Electromagnetic induction.

    Correct Answer
    A. Electromagnetic induction.
    Explanation
    Electromagnetic induction is the term used to describe the process of producing voltage in a conductor when it passes through a magnetic field. This phenomenon was discovered by Michael Faraday in the early 19th century and is the basis for the operation of many electrical devices such as generators and transformers. It occurs when there is a relative motion between a conductor and a magnetic field, resulting in the generation of an electromotive force (EMF) or voltage in the conductor. This process is fundamental in understanding the principles of electricity and magnetism.

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  • 7. 

     (410) The difference between DC and AC is that DC

    • Has a constant polarity; AC changes direction at regular intervals.

    • Fluctuates from negative to positive values; AC stays at a constant positive value.

    • Differs from AC only in the way current is used; otherwise there is no real difference.

    • Is produced directly from a generator; AC is produced by an alternator after the generator.

    Correct Answer
    A. Has a constant polarity; AC changes direction at regular intervals.
    Explanation
    DC stands for direct current, which means that the flow of electric charge is in one direction only. It has a constant polarity, meaning that the positive and negative terminals remain the same. On the other hand, AC stands for alternating current, which means that the flow of electric charge periodically changes direction. It fluctuates from negative to positive values, resulting in a constantly changing polarity. Therefore, the correct answer is that DC has a constant polarity, while AC changes direction at regular intervals.

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  • 8. 

      (427) 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, it acts as the basic engine tailpipe. This means that it serves as a regular exhaust outlet for the engine, allowing the gases produced during combustion to exit the engine and be expelled into the atmosphere. In this state, the augmentor does not provide any additional thrust or power to the engine.

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  • 9. 

     (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.

    Correct Answer
    A. Gasoline and kerosene.
    Explanation
    JP-8 fuel is a type of jet fuel used by the military. It is a mixture of kerosene and gasoline. The combination of these two components provides the necessary properties for jet engines, including high energy content and low freezing point. Gasoline helps to improve the volatility and ignition characteristics of the fuel, while kerosene provides the necessary lubrication and stability. Therefore, the correct answer is gasoline and kerosene.

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  • 10. 

     (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 filter that detects the pressure difference between the inlet and outlet 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 is a visual indication that can be easily observed during a visual inspection without having to disassemble the filter.

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  • 11. 

    (404) On the F100-PW–220 engine, which component controls the augmentor fuel control?

    • Fuel pump.

    • Fuel pump controller.

    • Signature elimination probe.

    • DEEC.

    Correct Answer
    A. DEEC.
    Explanation
    The DEEC (Digital Electronic Engine Control) is the component that controls the augmentor fuel control on the F100-PW-220 engine. The DEEC is responsible for monitoring and adjusting various engine parameters, including fuel flow, to optimize performance and ensure safe operation. It receives inputs from sensors throughout the engine and uses this information to make real-time adjustments to the fuel control system. By controlling the augmentor fuel flow, the DEEC helps regulate the engine's thrust output and ensures efficient operation.

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  • 12. 

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

    • Air/oil.

    • Fuel.

    • Hydraulic.

    • Pneumatic

    Correct Answer
    A. Air/oil.
    Explanation
    An air/oil oil cooler operates on the same principle as a radiator in an automobile. In an automobile radiator, air passes through the fins of the radiator and cools down the coolant flowing through it. Similarly, in an air/oil oil cooler, air is used to cool down the oil flowing through it. The air/oil cooler has fins that help in dissipating heat from the oil, making it an effective cooling method for oil systems.

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  • 13. 

     (407) On an F100-PW–220 engine, which bearing compartments drain into the gearbox by the tower shaft cavity?

    • 1 and 2.

    • 1 and 3.

    • 2 and 3.

    • 2 and 4.

    Correct Answer
    A. 2 and 3.
    Explanation
    On an F100-PW-220 engine, bearing compartments 2 and 3 drain into the gearbox by the tower shaft cavity.

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  • 14. 

     (409) Increased friction between moving parts in the oil system

    • Accelerates the rate of wear, decreasing the production of wear metal particles.

    • Accelerates the rate of wear, increasing the production of wear metal particles.

    • Slows the rate of wear, decreasing the production of wear metal particles.

    • Slows the rate of wear, increasing the production of wear metal particles.

    Correct Answer
    A. Accelerates the rate of wear, increasing the production of wear metal particles.
    Explanation
    Increased friction between moving parts in the oil system accelerates the rate of wear, increasing the production of wear metal particles. When there is increased friction, the surfaces of the moving parts rub against each other more vigorously, causing more wear and tear. This increased wear leads to the production of more wear metal particles, which can contaminate the oil and lead to further damage in the system.

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  • 15. 

    (413) What does the EGT/T5.6 thermocouple consist of?

    • Alumel.

    • Chromel.

    • Both alumel and chromel.

    • None of these.

    Correct Answer
    A. Both alumel and chromel.
    Explanation
    The EGT/T5.6 thermocouple consists of both alumel and chromel. Alumel and chromel are types of alloys commonly used in thermocouples. Alumel is an alloy of nickel, aluminum, manganese, and silicon, while chromel is an alloy of nickel and chromium. The combination of these two alloys allows the thermocouple to accurately measure temperature by utilizing the difference in electrical potential between the two metals.

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  • 16. 

     (424) What component in the F100 monitoring system provides the operator information concerning how much (in percentage) the augmentor nozzle is opened or closed?

    • Oil pressure transmitter.

    • Engine Diagnostic Unit.

    • Fan turbine Inlet Temperature.

    • Augmentor Nozzle positioning indicator.

    Correct Answer
    A. Augmentor Nozzle positioning indicator.
    Explanation
    The correct answer is the Augmentor Nozzle positioning indicator. This component in the F100 monitoring system provides the operator with information about the percentage of how much the augmentor nozzle is opened or closed. This is important for monitoring and controlling the engine's thrust and performance. The oil pressure transmitter, Engine Diagnostic Unit, and Fan turbine Inlet Temperature do not provide information specifically about the augmentor nozzle positioning.

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  • 17. 

     (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 in a jet engine is responsible for regulating the amount of fuel being supplied to the engine. By doing so, it ensures that the engine receives the right amount of fuel for safe and efficient operation. In the context of the question, flameout refers to the sudden extinguishing of the engine's flame, which can occur due to various reasons such as fuel starvation or malfunction. The main fuel control helps to prevent flameout by carefully managing the fuel flow, reducing the possibility of the engine losing its flame and shutting down unexpectedly.

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  • 18. 

    (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. The DEEC is responsible for monitoring and controlling various engine parameters, and it generates a significant amount of heat during operation. Fuel is used as a coolant to dissipate this heat and prevent the DEEC from overheating. This ensures the proper functioning and reliability of the engine control system.

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  • 19. 

     　(405) One micron is a metric linear measurement that is equal to

    • 1/25 inch.

    • 1/250 inch.

    • 1/2,500 inch.

    • 1/25,000 inch.

    Correct Answer
    A. 1/25,000 inch.
  • 20. 

     (407) 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 correct answer is secondary fan airflow as a coolant. On an F100-PW-220 engine, the air/oil coolers are mounted on the fan duct and use the secondary fan airflow as a coolant. This means that the coolers are cooled by the air that is being pushed by the secondary fan, which helps to regulate the temperature of the oil in the engine.

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  • 21. 

     (409) During an OAP sample collection, using your mouth to draw oil up into the plastic tube could result in

    • Insufficient oil collection.

    • Contaminated samples.

    • A minor stomach ache.

    • Paralysis or death.

    Correct Answer
    A. Paralysis or death.
    Explanation
    Using your mouth to draw oil up into the plastic tube during an OAP sample collection could result in paralysis or death. This is because the oil may contain toxic substances or chemicals that can be harmful if ingested. Inhaling or swallowing these substances can lead to severe health complications, including paralysis or even death. It is important to follow proper safety procedures and use appropriate equipment to avoid such risks during sample collection.

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  • 22. 

    (417) The JFS is basically a

    • Piston-type starter

    • Pneumatic-type starter.

    • Small gas turbine engine.

    • Cartridge-pneumatic starter.

    Correct Answer
    A. Small gas turbine engine.
    Explanation
    The JFS (Jet Fuel Starter) is a small gas turbine engine. This type of engine is commonly used in aircraft to provide the initial rotation needed to start the main engine. It operates using jet fuel as its power source and is designed to be compact and lightweight. The JFS is typically used in military aircraft and is known for its reliability and efficiency in starting the main engine.

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  • 23. 

     (419) What is one of the first indications of ice formation at aircraft engine inlets?

    • Compressor stall.

    • Variable nozzle closes.

    • Decrease in exhaust gas temperature.

    • Increase in RPM.

    Correct Answer
    A. Compressor stall.
    Explanation
    One of the first indications of ice formation at aircraft engine inlets is a compressor stall. Ice formation can disrupt the smooth flow of air into the engine, causing a disruption in the compressor's performance and leading to a stall. This can result in a loss of engine power and potentially dangerous situations for the aircraft. Therefore, a compressor stall is a clear indication that ice is forming at the engine inlets.

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  • 24. 

    (427) What are the two main types of augmentor (afterburner) ignition systems?

    • Torch igniter and hot streak.

    • Hot streak and fuel injection.

    • Pilot burner ring and hot streak.

    • Torch igniter and pilot burner ring.

    Correct Answer
    A. Torch igniter and pilot burner ring.
    Explanation
    The correct answer is Torch igniter and pilot burner ring. These are the two main types of augmentor (afterburner) ignition systems. A torch igniter is a device that uses a high-energy spark to ignite the fuel-air mixture in the afterburner, while a pilot burner ring is a continuous flame that ignites the fuel-air mixture. These ignition systems are essential for starting and maintaining the combustion process in the afterburner, which increases the thrust of the engine.

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  • 25. 

    (429) What component in the electronic/mechanical controls is a fuel cooled digital computer that provides signals to the MFC for control of the front compressor speed (N1), rear compressor speed (N2), engine airflow, combustion chamber pressure (Pb4) and FTIT.

    • MFC.

    • DEEC

    • Stator generator

    • Throttle quadrant.

    Correct Answer
    A. DEEC
    Explanation
    The correct answer is DEEC. DEEC stands for Digital Electronic Engine Control, which is a fuel cooled digital computer that provides signals to the MFC (Main Fuel Control) for control of various parameters such as front compressor speed (N1), rear compressor speed (N2), engine airflow, combustion chamber pressure (Pb4), and FTIT (Fan Turbine Inlet Temperature). DEEC is an important component in the electronic/mechanical controls system that helps regulate and optimize the performance of the engine.

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  • 26. 

    (403) If the safety seals on a fuel system component are broken or removed, and you suspect the factory adjustment was altered, you should

    • Adjust and reseal the component.

    • Keep the component in service to meet the mission.

    • Forward the component to the authorized depot for reflow and resealing.

    • Continue to keep the component in service if it is documented as a red diagonal on Form 781A, Hydromechanical Fuel Control.

    Correct Answer
    A. Forward the component to the authorized depot for reflow and resealing.
    Explanation
    If the safety seals on a fuel system component are broken or removed and there is suspicion that the factory adjustment was altered, the appropriate action would be to forward the component to the authorized depot for reflow and resealing. This ensures that the component is properly inspected, adjusted, and sealed by professionals who have the necessary expertise and equipment. It is important to maintain the integrity and safety of the fuel system, and sending the component to the authorized depot is the best course of action in this situation.

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  • 27. 

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

    • Replaced.

    • Die marked.

    • Safety sealed and/or lockwired.

    • Treated with a thread locking compound.

    Correct Answer
    A. Safety sealed and/or lockwired.
    Explanation
    During an engine trim procedure, calibration and/or adjustment screws may need to be set to ensure proper functioning. To prevent any unauthorized tampering or accidental adjustment, these screws must be safety sealed and/or lockwired. Safety sealing involves applying a seal or tag that indicates if the screw has been tampered with. Lockwiring involves securing the screw with a wire that prevents it from loosening or adjusting unintentionally. These measures ensure the accuracy and reliability of the engine trim procedure.

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  • 28. 

    (404) Core engine fuel flow sequence on an F100-PW–220 engine starts at the main fuel pump and then goes through the

    • AFP, AFC, fuel/oil cooler, P&D, and fuel nozzles.

    • MFC, fuel/oil cooler, P&D, and fuel nozzles.

    • AFC, AFP, fuel/oil cooler, P&D, and fuel nozzles.

    • Fuel/oil cooler, P&D, MFC, and fuel nozzles.

    Correct Answer
    A. MFC, fuel/oil cooler, P&D, and fuel nozzles.
    Explanation
    The correct answer is MFC, fuel/oil cooler, P&D, and fuel nozzles. This sequence indicates the order in which fuel flows through the core engine components on an F100-PW-220 engine. It starts with the MFC (Main Fuel Control) which regulates and controls the fuel flow. Then, the fuel passes through the fuel/oil cooler, which helps to cool the fuel and oil. Next, it goes through the P&D (Primary and Drain) valves, which are responsible for controlling the flow of fuel to the combustion chamber. Finally, the fuel reaches the fuel nozzles where it is injected into the combustion chamber for combustion.

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  • 29. 

     (408) Which action concerning open oil containers is correct?

    • Dispose of any portion not immediately used.

    • Store remaining portion immediately after use.

    • Dispose of any portion not used within 60 days.

    • Store remaining portion in clearly marked containers.

    Correct Answer
    A. Dispose of any portion not immediately used.
    Explanation
    The correct action concerning open oil containers is to dispose of any portion not immediately used. This is important because leaving open oil containers can lead to contamination, evaporation, and degradation of the oil. It is best to dispose of any unused portion to prevent any potential hazards or loss of quality.

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  • 30. 

     (409) For bases that do not have an OAP laboratory, who designates the facility to which oil samples are sent?

    • Base commander.

    • Unit commander.

    • Program manager.

    • Unit safety officer.

    Correct Answer
    A. Program manager.
    Explanation
    The program manager is responsible for designating the facility to which oil samples are sent in bases that do not have an OAP laboratory. This is because the program manager oversees the overall management and coordination of the program, including the collection and analysis of oil samples. The base commander, unit commander, and unit safety officer do not have direct responsibility for this task.

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  • 31. 

     (419) 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 correct answer is Compressor. Discharge air used for aircraft engine anti-icing is taken from the compressor area. The compressor is responsible for compressing the incoming air before it enters the combustion chamber. This compressed air is then used for various purposes, including anti-icing to heat-critical areas of the engine. By taking air from the compressor, it ensures that the air used for anti-icing is at a high enough pressure and temperature to effectively prevent ice formation in critical areas.

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  • 32. 

    Select the ones you like

    • Option1

    • Option2

    • Option3

    • Option4

    Correct Answer
    A. Option1
    Explanation
    The question asks the test-taker to select the option(s) they like. The correct answer is Option 1, indicating that the test-taker likes that option.

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  • 33. 

    (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 is the fuel system component that controls the pressurization of the core engine fuel system. The fuel nozzle is responsible for injecting fuel into the combustion chamber, the N2 sensor measures the rotational speed of the engine's high-pressure turbine, and the Tt 2.5 sensor measures the turbine inlet temperature. Therefore, the correct answer is the P&D valve.

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  • 34. 

     　(405) 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 test whether there is a continuous electrical path between two points. In the case of chip detectors, this is important because they are used to detect the presence of metallic particles or debris in an aircraft's lubrication system. By checking for continuity, the chip detector can determine if there is a break in the electrical circuit, which could indicate the presence of a chip or debris that is interrupting the flow of current.

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  • 35. 

     (405) Carbon seals should be cleaned by soaking them in clean, warm

    • JP–4 for 60 minutes

    • PD–680 for 30 minutes.

    • Kerosene for 60 minutes.

    • Engine lubricating oil for 30 minutes.

    Correct Answer
    A. Engine lubricating oil for 30 minutes.
    Explanation
    Carbon seals should be cleaned by soaking them in engine lubricating oil for 30 minutes. This is because carbon seals are used in engines to prevent leakage of fluids and gases. Over time, carbon deposits can build up on these seals, affecting their performance. Soaking them in engine lubricating oil helps to dissolve and remove these carbon deposits, restoring the seals' effectiveness. The use of engine lubricating oil is preferred over other options like JP-4 or kerosene as it is specifically designed to lubricate and protect engine components, making it more suitable for cleaning carbon seals.

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  • 36. 

     (409) 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 enough fluid into a container in order to remove any water and sludge that may have accumulated in the oil. This is important because water and sludge can contaminate the oil and affect its performance. By draining off water and sludge, the oil sample obtained will be more representative of the actual condition of the oil, allowing for more accurate analysis and assessment.

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  • 37. 

    (418) On the F-15 secondary power system CGB, how are the isolation decouplers extended?

    • Manually.

    • Electrically.

    • Hydraulically.

    • By spring pressure.

    Correct Answer
    A. Hydraulically.
    Explanation
    The isolation decouplers on the F-15 secondary power system CGB are extended hydraulically. This means that hydraulic pressure is used to extend the decouplers, allowing them to separate or isolate different components or systems within the aircraft.

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  • 38. 

    (422) 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 served its purpose and is no longer needed for cooling. Instead of being recirculated back to the compressor or expelled through bleed holes in the turbine case, it is simply allowed to flow out of the engine along with the exhaust gases.

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  • 39. 

      (426) What component or components make up the engine monitoring system on the F119 engine itself?

    • DEC.

    • CEDU.

    • FADEC

    • CEDU and FADEC.

    Correct Answer
    A. CEDU and FADEC.
    Explanation
    The engine monitoring system on the F119 engine consists of two components: CEDU (Central Engine Data Unit) and FADEC (Full Authority Digital Engine Control). The CEDU collects and processes data from various sensors on the engine, while the FADEC uses this data to control and optimize engine performance. Together, these components ensure that the engine operates efficiently and safely.

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  • 40. 

    (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 components such as thermocouples, relays, amplifiers, and solenoids to control a jet engine. This type of fuel control system combines electrical and hydraulic mechanisms to regulate the flow of fuel and maintain optimal engine performance.

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  • 41. 

     　(405) The purpose of an oil-temperature control valve used with air/oil coolers is to

    • Control the oil poppet valve.

    • Direct oil around the fuel filter.

    • Control oil exiting from the cooler.

    • Direct oil around or through the cooler.

    Correct Answer
    A. Direct oil around or through the cooler.
    Explanation
    The purpose of an oil-temperature control valve used with air/oil coolers is to direct oil around or through the cooler. This valve helps regulate the flow of oil to maintain the desired temperature by either bypassing the cooler or directing the oil through it. By controlling the flow, the valve ensures that the oil is either cooled or bypassed depending on the temperature requirements, thus helping to maintain optimal oil temperature for the engine.

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  • 42. 

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

    • More oil sampling.

    • More engine removals.

    • Less unnecessary maintenance.

    • Less wear metal found in the oil.

    Correct Answer
    A. Less unnecessary maintenance.
    Explanation
    The correct answer is "less unnecessary maintenance." Spectrometric oil analysis allows for the detection of wear metals in the oil, which can indicate potential engine issues. By identifying these issues early on, maintenance can be targeted and focused, reducing the need for unnecessary maintenance tasks. This can result in a higher in-commission rate for aircraft as maintenance is only performed when necessary, minimizing downtime and increasing operational efficiency.

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  • 43. 

     (411) Which component ensures the CSD output speed is always at the desired RPM to adjust and maintain the desired 400 Hz?

    • Wobbler control.

    • Pump and motor unit.

    • Variable pump wobbler.

    • Frequency and load controller.

    Correct Answer
    A. Frequency and load controller.
    Explanation
    The frequency and load controller is responsible for ensuring that the CSD (Constant Speed Drive) output speed is always at the desired RPM to adjust and maintain the desired 400 Hz. It monitors the frequency and load of the system and makes necessary adjustments to the pump and motor unit to maintain the desired speed. The wobbler control and variable pump wobbler are not mentioned in relation to maintaining the desired RPM and 400 Hz.

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  • 44. 

     (420) 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 anti-icing system on an F110-GE-129 engine is designed to prevent the formation and accumulation of ice on various components. In this case, it specifically targets the fan inlet guide vane flaps. These flaps are located at the front of the engine and play a crucial role in controlling the airflow into the engine. Ice formation on these flaps can disrupt the airflow and potentially lead to engine performance issues. Therefore, the anti-icing system focuses on preventing ice buildup on the fan inlet guide vane flaps to ensure optimal engine operation.

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  • 45. 

     (421) The bleed air system is different from the variable vane system in that it

    • Allows airflow in only one direction.

    • Bleeds off air before it enters the engine.

    • Prevents airflow from entering the engine.

    • Bleeds off air after it has entered the engine.

    Correct Answer
    A. Bleeds off air after it has entered the engine.
    Explanation
    The bleed air system is different from the variable vane system because it bleeds off air after it has entered the engine. This means that the bleed air system removes excess air from the engine, which helps to regulate and control the engine's performance. In contrast, the variable vane system adjusts the angle of the engine's vanes to control the airflow and optimize engine performance.

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  • 46. 

     (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, water will take four times longer to settle out of JP-8 than out of gasoline.

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  • 47. 

    (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 a single unit. This means that instead of having two separate controls for fuel metering, the unified device integrates both controls into one component. This simplifies the fuel metering system and improves efficiency by reducing the number of components required.

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  • 48. 

     　(405) Which type of valve permits oil flow in only one direction?

    • Check.

    • Relief.

    • Bypass.

    • Pressurizing.

    Correct Answer
    A. Check.
    Explanation
    A check valve is a type of valve that allows fluid (in this case, oil) to flow in only one direction. It prevents backflow, ensuring that the oil can only move in the desired direction. This is achieved through a mechanism that automatically closes the valve when the flow reverses, preventing any backward movement of the oil. Therefore, a check valve is the correct answer for a valve that permits oil flow in only one direction.

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  • 49. 

     (405) 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 carbon oil seal needs to maintain a static preload to prevent leakage. This preload is provided by spring pressure, which ensures that the seal remains compressed and tightly sealed even when there is no oil or hydraulic pressure present. Air pressure and hydraulic pressure are not suitable for providing static preload in this scenario, while oil pressure is not applicable when the engine is not operating. Hence, spring pressure is the correct answer.

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Quiz Review Timeline (Updated): Jun 24, 2024 +

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  • Current Version
  • Jun 24, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 23, 2015
    Quiz Created by
    Andrew

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