CDC 2a651s Volume 3 By CDCmaster

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  • 1/110 Questions

    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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About This Quiz

CDC 2A651s Volume 3 by CDCmaster explores the intricacies of jet fuel systems, focusing on fuel composition, handling, and engine interactions. It assesses key skills in identifying fuel types, managing fuel-related engine issues, and understanding fuel system mechanics relevant to aircraft operation.

CDC 2a651s Volume 3 By CDCmaster - Quiz

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  • 2. 

    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 fuel flow to ensure the engine operates smoothly and efficiently. By carefully controlling the fuel-air mixture, the main fuel control helps prevent a flameout, which is the sudden extinguishing of the engine's flame. A flameout can occur due to various factors such as fuel starvation or excessive airflow disturbances. Therefore, the main fuel control plays a crucial role in maintaining a consistent and reliable combustion process, reducing the risk of a flameout and ensuring the engine's safe acceleration.

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  • 3. 

    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
    A differential pressure indicator is actuated when a fuel filter is clogged. This means that there is a noticeable difference in pressure on either side of the filter, indicating a blockage. This indicator is designed to alert the user when the filter needs to be replaced or cleaned to ensure proper fuel flow.

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  • 4. 

    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 he 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 he 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 adjusted and resealed by experts, maintaining its safety and functionality.

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  • 5. 

    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 need to be safety sealed and/or lockwired. This is done to ensure that these screws do not loosen or change position over time, which could lead to incorrect engine settings and potential safety hazards. Safety sealing and lockwiring provide an additional level of security by preventing unauthorized adjustments or tampering with the screws. This helps maintain the accuracy and reliability of the engine trim procedure.

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  • 6. 

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

    • MEC

    • PMG

    • TSFC

    • DEEC

    Correct Answer
    A. DEEC
    Explanation
    DEEC stands for Digital Electronic Engine Control, which is a system that controls the operation of the F100-PW-220 engine when it is in the primary mode. It is responsible for regulating various engine parameters such as fuel flow, ignition timing, and engine performance. By monitoring and adjusting these parameters, the DEEC ensures optimal engine operation, efficiency, and performance.

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  • 7. 

    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 cooler operates on the same principle as a radiator in an automobile. Both the radiator and air/oil cooler use the process of heat exchange to cool down the fluid passing through them. In the case of an air/oil cooler, air is used to cool down the oil, similar to how air cools down the coolant in a radiator. This type of oil cooler is commonly used in various applications such as hydraulic systems, engines, and industrial machinery.

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  • 8. 

    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 are typically used in engines to prevent leakage of fluids or gases. Over time, carbon deposits can build up on these seals, affecting their performance. Cleaning the carbon seals is necessary to maintain their effectiveness. Engine lubricating oil is a suitable cleaning agent for carbon seals as it can dissolve and remove the carbon deposits. Soaking the seals in engine lubricating oil for 30 minutes allows the oil to penetrate and break down the carbon, making it easier to clean off the seals.

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  • 9. 

    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 correct answer because it refers to the process of air being mixed with the oil in the oil pump, resulting in the formation of pockets of air. This can lead to reduced lubrication efficiency and potential damage to the machinery due to the presence of air bubbles in the oil.

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  • 10. 

    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 that is not immediately used. This is important because leaving oil in open containers can lead to contamination and degradation of the oil, making it unusable. It is best to dispose of any unused oil promptly to prevent any potential hazards or damage.

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  • 11. 

    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 referred to as wear metals. These particles are generated due to the friction and wear of metal components in the system, such as engine parts. The presence of wear metals in the oil can indicate the level of wear and tear happening within the machinery, allowing for early detection of potential issues and the need for maintenance or repairs.

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  • 12. 

    Increased friction between moving parts in the oil system

    • Accelerates the rear 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 leads to more wear and tear on those parts. This increased wear accelerates the rate at which the parts degrade, leading to an increase in the production of wear metal particles.

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  • 13. 

    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 oil may contain toxic substances that can be harmful if ingested. Ingesting contaminated oil can lead to severe health consequences, including paralysis or even fatality. Therefore, it is important to follow proper safety protocols and use appropriate tools for sample collection to avoid such risks.

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  • 14. 

    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. This is important because water and sludge can contaminate the oil sample and affect its accuracy. By draining off the water and sludge, the oil sample will provide a more representative analysis of the oil condition.

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  • 15. 

    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
    The correct answer is 2 and 3. In an F100-PW-220 engine, the bearing compartments 2 and 3 drain into the gearbox through the tower shaft cavity.

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  • 16. 

    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 term used to describe the process of producing voltage in a conductor when it passes through a magnetic field. This phenomenon was first discovered by Michael Faraday in the early 19th century. When a conductor moves through a magnetic field or when there is a change in the magnetic field around a conductor, it induces an electric current in the conductor. This principle forms the basis for many electrical devices such as generators, transformers, and induction motors.

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  • 17. 

    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 changes direction periodically. It fluctuates from negative to positive values, constantly reversing its polarity. Therefore, the correct answer is that DC has a constant polarity, while AC changes direction at regular intervals.

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  • 18. 

    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 is an alloy of nickel, aluminum, manganese, and silicon, while Chromel is an alloy of nickel and chromium. These two alloys are commonly used in thermocouples due to their high temperature resistance and stability. By combining Alumel and Chromel, the EGT/T5.6 thermocouple is able to accurately measure high temperatures in various applications such as exhaust gas temperature monitoring in engines.

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  • 19. 

    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 correct answer is "small gas turbine engine" because the JFS (Jet Fuel Starter) is a type of auxiliary power unit used in aircraft. It is a small gas turbine engine that provides power to start the main engines of the aircraft. It operates using jet fuel and is commonly used in military aircraft.

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  • 20. 

    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). It plays a crucial role in regulating and optimizing the performance of the engine by continuously monitoring and adjusting these parameters.

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  • 21. 

    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 controlling and monitoring various engine parameters to ensure optimal performance. Cooling the DEEC with fuel helps to dissipate the heat generated by the electronic components, preventing overheating and potential damage. This method of cooling is effective and efficient, as fuel is readily available within the engine system.

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  • 22. 

    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 pressurization of the core engine fuel system. It regulates the flow of fuel to maintain the desired pressure within the system. The fuel nozzle, N2 sensor, and Tt 2.5 sensor are not directly responsible for controlling pressurization of the fuel system.

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  • 23. 

    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. The gear and rotor work together to create a pumping action, drawing in and displacing oil. This design allows for efficient and reliable oil flow, making it commonly used in various applications such as automotive engines.

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  • 24. 

    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 the chip detector is used to check if there is a complete electrical circuit between two points. By conducting a continuity check, the chip detector can determine if there is a break or interruption in the electrical connection, which could indicate a potential issue or fault in the system.

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  • 25. 

    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 temperature of the oil by controlling its flow. By directing the oil around or through the cooler, the valve ensures that the oil is exposed to the cooling effect of the air/oil cooler, helping to maintain the desired temperature range.

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  • 26. 

    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 using soft metal, making them vulnerable to damage. The soft metal construction means that these seals can be easily damaged, which implies that they require careful handling and maintenance.

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  • 27. 

    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 breather pressurizing valve on an F100 engine is internally mounted in the gearbox. This means that it is located within the gearbox itself rather than being located in the oil tank, oil filter, or oil pump. The breather pressurizing valve is responsible for regulating the pressure inside the gearbox, ensuring that it remains at the appropriate level for optimal performance and lubrication.

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  • 28. 

    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
    If the red button on an F100-PW-220 engine oil filter pops out and remains extended, it indicates that the design pressure differential has been exceeded. The design pressure differential refers to the maximum pressure difference that the oil filter can handle. When this limit is surpassed, the button is designed to pop out as a safety measure to indicate that the filter needs to be replaced. This ensures that the engine is protected from potential damage caused by excessive pressure.

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  • 29. 

    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
    By using spectrometric oil analysis, aircraft can detect any wear metal present in the oil. This allows for targeted maintenance and engine removals when necessary, reducing the need for unnecessary maintenance. As a result, the aircraft's in-commission rate increases as there are fewer instances of maintenance that is not required. Additionally, the analysis also helps in identifying any potential issues early on, enabling timely repairs and preventing further damage.

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  • 30. 

    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 specific parts of the engine. The question lists several components, including the front frame struts, forward centerbody, ring cowl, fan inlet guide vane flaps, variable exhaust nozzle flaps, and C-D duct. The correct answer is "fan inlet guide vane flaps." This means that the anti-icing system is specifically responsible for preventing ice formation and accumulation on the fan inlet guide vane flaps to ensure proper engine performance and prevent any potential damage caused by ice.

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  • 31. 

    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 Augmentor Nozzle positioning indicator is the component in the F100 monitoring system that provides the operator with information about the percentage of opening or closing of the augmentor nozzle. This indicator allows the operator to monitor and adjust the position of the nozzle, which is crucial for controlling the engine's thrust and performance. The other options, such as the oil pressure transmitter, engine diagnostic unit, and fan turbine inlet temperature, do not directly provide information about the augmentor nozzle's position.

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  • 32. 

    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 the fuel flow in a jet engine. These components work together to monitor and adjust the fuel mixture, ensuring optimal engine performance and efficiency.

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  • 33. 

    The F100 UFC senses certain variables from the engine through the use of

    • A closed loop design

    • An open circuit design

    • The feedback control unit

    • A direct mechanical connection to all engine sensors

    Correct Answer
    A. A closed loop design
    Explanation
    The F100 UFC senses certain variables from the engine through a closed loop design. In a closed loop design, the system continuously monitors the variables and adjusts its operation based on the feedback received. This allows for more precise control and ensures that the desired variables are maintained within a specific range. It is an effective method for regulating and optimizing engine performance.

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  • 34. 

    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 the compressor.

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  • 35. 

    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. Spring pressure ensures that the carbon oil seal remains in contact with the rotating shaft, creating a seal that prevents leakage of oil. This preload ensures that the seal is effective even when there is no air pressure, oil pressure, or hydraulic pressure present.

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  • 36. 

    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, which means it has the potential to cause damage or wear away materials it comes into contact with. This is an important property for a journeyman to be aware of because it can affect the maintenance and safety of the engine.

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  • 37. 

    Who is responsible for ensuring that the OAP operates properly?

    • Project monitor

    • Logistics commander

    • Propulsion flight chief

    • Laboratory supervisor

    Correct Answer
    A. Project monitor
    Explanation
    The project monitor is responsible for ensuring that the OAP (Operational Analysis Plan) operates properly. They oversee the project and monitor its progress, making sure that all aspects of the plan are being implemented correctly. This includes ensuring that the OAP is being followed, analyzing the data collected, and making any necessary adjustments or recommendations to ensure the project's success. The project monitor plays a crucial role in ensuring that the OAP operates smoothly and effectively.

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  • 38. 

    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 starting the engine by providing the initial combustion and airflow. The turbine plenum is designed to contain and direct the hot gases produced by the JFS combustion, ensuring efficient operation and preventing damage to other engine components.

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  • 39. 

    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. Bernoulli's law states that as the speed of a fluid increases, its pressure decreases. In the case of the supersonic inlet, the high-speed airflow is slowed down by increasing its pressure. This is achieved by using a convergent-divergent shape in the inlet, which causes the airflow to accelerate and then decelerate, resulting in a decrease in speed and an increase in pressure.

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  • 40. 

    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
    The augmentor (afterburner) acts as the basic engine tailpipe when it is not operating. This means that it serves as the primary outlet for the engine exhaust gases.

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  • 41. 

    The F100 engine augmentor's primary nozzle actuator is driven by cables from the

    • T5 amplifier

    • Unified control

    • Afterburner control

    • CENC

    Correct Answer
    A. CENC
    Explanation
    The correct answer is CENC because the F100 engine augmentor's primary nozzle actuator is driven by cables from the CENC (Combustion Engine Nozzle Control) system. The CENC system is responsible for controlling the position and movement of the primary nozzle actuator, which in turn controls the flow of exhaust gases and thrust output of the engine. By driving the actuator through cables, the CENC system ensures precise and responsive control over the engine's afterburner and augmentor functions.

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  • 42. 

    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 a type of oil seal that has soft metal as its basic composition and allows a small amount of airflow to prevent oil seepage. The design of a labyrinth seal consists of a series of interlocking grooves or channels that create a tortuous path for the oil to flow through. This design effectively prevents oil leakage by trapping the oil within the grooves, while still allowing a controlled amount of airflow to prevent pressure buildup.

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  • 43. 

    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
    In bases without an OAP laboratory, the program manager is responsible for designating the facility to which oil samples are sent. The program manager oversees the overall management and coordination of the oil analysis program, including the selection of an external laboratory for sample analysis. They are knowledgeable about the program requirements and can make informed decisions regarding the appropriate facility to handle the oil samples. The base commander, unit commander, and unit safety officer may have other responsibilities but are not specifically tasked with designating the facility for oil sample analysis.

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  • 44. 

    Oil sampling intervals should not vary by more than

    • 5 percent

    • 10 percent

    • 15 percent

    • 20 percent

    Correct Answer
    A. 10 percent
    Explanation
    Oil sampling intervals should not vary by more than 10 percent because this ensures consistency and accuracy in monitoring the condition of the oil. If the intervals vary by more than 10 percent, there is a higher risk of missing potential issues or changes in the oil's condition. By keeping the sampling intervals within a 10 percent range, it allows for regular and reliable monitoring of the oil's quality and helps in identifying any necessary maintenance or changes needed to ensure optimal performance and longevity of the machinery.

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  • 45. 

    A simple DC ignition system consists of vibrator,

    • AC to DC converter, transformer, and igniter plugs

    • Igniter plugs, and AC to DC converter

    • Ac to DC converter, and transformer

    • Igniter plugs, and transformer

    Correct Answer
    A. Igniter plugs, and transformer
    Explanation
    The correct answer is igniter plugs and transformer. In a simple DC ignition system, the igniter plugs are responsible for creating the spark that ignites the fuel-air mixture in the engine. The transformer is used to step up the voltage from the DC power source to a higher voltage required for the spark to occur. The AC to DC converter is not necessary in this system as it converts alternating current to direct current, which is not needed for ignition.

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  • 46. 

    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 cooling the turbine section, the cooling airflow is directed into the gas stream to exit the engine. This means that the cooled air is mixed with the hot exhaust gases and expelled from the engine. This ensures that the cooled air does not go to waste and is effectively utilized in the engine's operation.

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  • 47. 

    For actuation of the variable vane systems on an F100-PW220 engine, the MFC provides both the CIVV and

    • Rear compressor variable vane actuators with pneumatic (air) pressure

    • Rear compressor variable vane actuators with fuel pressure

    • Variable exhaust nozzle actuators with pneumatic pressure

    • Variable exhaust nozzle actuators with fuel pressure

    Correct Answer
    A. Rear compressor variable vane actuators with fuel pressure
    Explanation
    The MFC (Main Fuel Control) provides fuel pressure to the rear compressor variable vane actuators on an F100-PW220 engine. This means that the fuel is used to actuate and control the movement of the variable vanes in the rear compressor section of the engine. The variable vanes help optimize the engine's performance by adjusting the airflow and pressure in the compressor, which in turn affects the engine's overall efficiency and power output.

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  • 48. 

    One micron is a metric linear measurement that is equal to

    • 1/25 inch

    • 1/250 inch

    • 1/2500 inch

    • 1/25000 inch

    Correct Answer
    A. 1/25000 inch
    Explanation
    One micron is a very small unit of measurement, equal to one millionth of a meter. Since there are 25,400 microns in an inch, we can calculate the equivalent measurement in inches by dividing 1 inch by 25,400. This gives us approximately 0.00003937 inches, which is equal to 1/25000 inch.

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  • 49. 

    How does the AFTLA obtain oil samples for analysis?

    • Upon request from the depot

    • Automatically from the depot

    • Upon request from the manufacturer

    • Automatically from the manufacturer

    Correct Answer
    A. Automatically from the manufacturer
    Explanation
    The AFTLA obtains oil samples for analysis automatically from the manufacturer. This means that the manufacturer has a system in place that automatically provides oil samples to the AFTLA without the need for any specific request. This method ensures a regular and consistent supply of oil samples for analysis, allowing the AFTLA to monitor the quality and performance of the oil being used.

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Quiz Review Timeline (Updated): Jun 19, 2024 +

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  • Current Version
  • Jun 19, 2024
    Quiz Edited by
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  • Aug 13, 2015
    Quiz Created by
    CDCmaster

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