Volume 3 - 2014 CDC 2a651s Jet Aircraft

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1/110 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.

About This Quiz

Volume 3 - 2014 CDC 2A651s Jet aircraft quiz assesses knowledge on jet fuel systems, including JP-8 fuel composition, water separation, fuel icing conditions, and engine thrust control. It is crucial for understanding fuel system management and safety in jet aircraft operations.

Quiz Preview

2.

(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

A differential pressure indicator is actuated when a fuel filter is clogged. This means that there is a noticeable difference in pressure between the inlet and outlet of the filter, indicating a blockage. This indicator serves as a visual or audible signal to the inspector that the filter needs to be cleaned or replaced. It provides a convenient and efficient way to determine if a fuel filter is clogged without the need to disassemble it.

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3.

(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

The DEEC (Digital Electronic Engine Control) controls the operation of the F100-PW-220 engine when it is in the primary mode. The DEEC is responsible for monitoring and adjusting various engine parameters such as fuel flow, exhaust temperature, and compressor speed to ensure optimal engine performance and efficiency. It receives inputs from various sensors and uses its algorithms to make real-time adjustments to maintain the engine within safe operating limits.

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4.

(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

The correct answer is "soft metal construction; these seals can be damaged easily." This is because labyrinth seals are made of soft metal, which means they are more susceptible to damage. They can easily be bent, dented, or scratched, leading to a compromised seal and potential leakage. It is important to handle them with extreme care to avoid any damage. The other options are incorrect because they either mention sharpness and cutting, which is not relevant to the construction material, or they mention hard metal construction, which is not true for labyrinth seals.

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5.

(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 is an alloy made of nickel, aluminum, manganese, and silicon, while chromel is an alloy made of nickel and chromium. These two alloys are commonly used in the construction of 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.

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6.

(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 allows the jet engine to safely accelerate, reducing the possibility of flameout. Flameout refers to the sudden extinguishing of the flame in the engine combustion chamber, leading to a loss of thrust. The main fuel control ensures the proper fuel-air mixture is maintained, preventing an overly lean or rich mixture that could result in flameout. By controlling the fuel flow, the main fuel control helps maintain a stable and continuous combustion process, ensuring the engine operates smoothly and avoids flameout.

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7.

(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 regulate the fuel flow in a jet engine. These components work together to measure and control various parameters such as temperature, pressure, and flow rate to ensure efficient and precise fuel delivery. This type of fuel control system combines electrical, hydraulic, and mechanical elements to achieve optimal engine performance.

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8.

(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.

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9.

(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 is to forward the component to the authorized depot for reflow and resealing. This ensures that the component is properly inspected, adjusted, and sealed by authorized personnel, maintaining its safety and functionality.

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10.

(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, such as fuel flow, temperature, and pressure. Since fuel is already present in the engine, it is utilized to cool the DEEC as it circulates through the system. This helps to maintain the optimal operating temperature of the DEEC and ensures its proper functioning.

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11.

(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.
12.

(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 come from various sources such as the engine, transmission, or other mechanical components. Monitoring the levels of wear metals in the oil can provide valuable information about the condition of the machinery and can help identify potential issues or failures before they occur.

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13.

(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

The term "unified" describes a jet engine fuel metering device that is really two fuel controls in one component. This means that the device combines two separate fuel controls into a single component, providing a more efficient and streamlined system for metering fuel in a jet engine.

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14.

(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 that these screws remain in the correct position and prevent any unauthorized tampering or adjustment, they must be safety sealed and/or lockwired. Safety sealing involves adding a seal or tag to indicate that the screws have been properly set and should not be tampered with. Lockwiring involves securing the screws with a wire or other locking mechanism to prevent them from loosening or changing position. This helps maintain the accuracy and reliability of the engine trim procedure.

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15.

(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 cooler operates on the same principle as a radiator in an automobile. In both cases, heat is transferred from a hot fluid (oil in the case of an air/oil cooler, coolant in the case of a radiator) to the surrounding air. The hot fluid flows through a series of tubes or fins, and air is passed over these surfaces to cool the fluid down. This process allows for efficient cooling of the fluid, preventing it from overheating and maintaining optimal operating conditions.

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16.

(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 can result in paralysis or death. This is because the oil may contain toxic substances or chemicals that can be harmful if ingested. Ingesting these substances can lead to severe health complications, including paralysis or even death. Therefore, it is important to follow proper safety procedures and use the appropriate equipment when collecting oil samples to avoid such risks.

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17.

(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 correct answer is small gas turbine engine. This is because the JFS (Jet Fuel Starter) is a type of small gas turbine engine that is used to start larger gas turbine engines. It provides the necessary power to start the main engine by using compressed air generated by the small gas turbine engine. This allows for a self-sustaining starting system, as the JFS can start itself and then start the main engine.

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18.

(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 controlling various aspects of the engine's performance. It controls the front compressor speed (N1), rear compressor speed (N2), engine airflow, combustion chamber pressure (Pb4), and FTIT (Fan Turbine Inlet Temperature). The DEEC plays a crucial role in optimizing the engine's efficiency and ensuring smooth operation.

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19.

(405) 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 oil into the pump and then forcing it out through the outlet. This type of pump is commonly used in automotive engines and other applications where a reliable and efficient oil pump is needed.

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20.

(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. This wear leads to the generation of wear metal particles, which are small metal fragments that are released into the oil system. Therefore, the correct answer is that increased friction accelerates the rate of wear and increases the production of wear metal particles.

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21.

(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. This results in a constant polarity, where the positive and negative terminals of the source remain the same. On the other hand, AC stands for Alternating Current, where the flow of electric charge periodically changes direction. This causes the polarity to alternate between positive and negative at regular intervals. Therefore, the correct answer is that DC has a constant polarity, while AC changes direction at regular intervals.

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22.

(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, its basic function is to act as the basic engine tailpipe. This means that it functions as a regular exhaust pipe for the engine, allowing the exhaust gases to exit the engine and be released into the atmosphere. The augmentor does not have any additional functions or controls when it is not in operation.

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23.

(410) 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 and is a fundamental principle in the field of electromagnetism. It is the basis for the operation of electric generators and transformers, as well as many other electrical devices.

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24.

(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 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. By using the discharge air from the compressor, which is already at a high temperature, it can be directed to heat critical areas of the aircraft engine to prevent ice formation. This helps to ensure that the engine operates efficiently and safely in cold weather conditions.

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25.

(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 temperature is lower, increasing the likelihood of ice formation. The viscosity of a fuel refers to its thickness or resistance to flow. A higher viscosity means the fuel is thicker and less likely to flow easily. In the case of jet fuels, a higher viscosity would make it more difficult for the fuel to flow through the fuel system, increasing the risk of icing. Therefore, the correct answer is higher viscosity of jet fuels.

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26.

(407) 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

When 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. This means that the pressure difference between the inlet and outlet of the oil filter has surpassed the maximum limit set by the design specifications. This could be due to various factors such as a clogged filter, excessive pressure in the engine, or a malfunctioning pressure relief valve. It is important to address this issue promptly to prevent any potential damage to the engine.

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27.

(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 maintenance and inspection program, including the analysis of oil samples. The base commander, unit commander, and unit safety officer may have their own responsibilities, but they are not specifically designated to determine the facility for oil sample testing.

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28.

(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 correct answer is 13th. In a F100-PW-220 engine, the 13th stage of the compressor is responsible for driving the augmenter fuel pump. This stage provides the necessary power to pump fuel into the afterburner, increasing thrust and performance.

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29.

(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.

Explanation

One micron is a very small unit of measurement, equal to one millionth of a meter. To convert it to inches, we need to know that there are 25,400 microns in an inch. Therefore, to find the equivalent measurement in inches, we divide 1 by 25,400, which gives us 1/25,400 inch.

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30.

(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 the chip detector is used to check whether there is a continuous electrical connection between two points or components. By checking for continuity, the chip detector can determine if there is a break or interruption in the electrical circuit, which could indicate a potential issue or fault.

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31.

(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 is responsible for regulating the flow of oil to ensure that it is properly cooled before returning to the engine. By directing the oil around or through the cooler, the valve helps maintain the optimal temperature of the oil, preventing it from overheating and potentially causing damage to the engine.

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32.

(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. The springs in the oil seal apply a constant force on the seal, ensuring that it remains in contact with the shaft and prevents oil from escaping.

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33.

(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 drain off water and sludge. This is important because water and sludge can contaminate the oil and affect its performance and lubricating properties. By draining off water and sludge before taking the oil sample, the sample will be more accurate and representative of the oil condition.

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34.

(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 required pressure in the system. The fuel nozzle, N2 sensor, and Tt 2.5 sensor are not directly responsible for controlling the pressurization of the fuel system.

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35.

(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 is the correct sequence for the core engine fuel flow on an F100-PW-220 engine. The fuel flow starts at the MFC (Main Fuel Control) which regulates the fuel flow rate. Then, it goes through the fuel/oil cooler to cool the fuel before entering the P&D (Pump and Dump) system. Finally, the fuel flows through the fuel nozzles where it is injected into the combustion chamber for combustion.

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36.

(405) 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. It is designed with a complex maze-like structure that creates multiple barriers for the oil, making it difficult for it to escape. This type of seal is commonly used in machinery and engines to ensure proper lubrication while minimizing oil leakage.

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37.

(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 output speed is always at the desired RPM to adjust and maintain the desired 400 Hz. This component monitors the frequency and load of the system and makes necessary adjustments to the pump and motor unit to maintain the desired output speed. The wobbler control and variable pump wobbler may play a role in the control system, but the frequency and load controller is the primary component responsible for this task.

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38.

(417) 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 and providing additional power during certain flight phases. The turbine plenum is a chamber located between the compressor and turbine sections of the engine, where the combustion process takes place. It is designed to contain and direct the flow of hot gases produced by the combustion, which then drive the turbine and generate thrust.

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39.

(418) On the F-15 secondary power system, what is used to stop the JFS starting cycle when the aircraft engine has accelerated to starter cutout speed?
- Four-speed cutout switch.
- Manual decoupler.
- Hydraulic decoupler.
- 50-percent engine cutout switch assembly.
Correct Answer

A. 50-percent engine cutout switch assembly.

Explanation

The 50-percent engine cutout switch assembly is used to stop the JFS (Jet Fuel Starter) starting cycle when the aircraft engine has accelerated to starter cutout speed on the F-15 secondary power system. This switch assembly is designed to cut off the fuel flow to the engine when it reaches 50 percent power, preventing the JFS from continuing to provide starting power. This helps to ensure a smooth transition from the JFS to the engine's own power source.

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40.

(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 specific 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 directing the airflow into the engine. Ice formation on these flaps can disrupt the airflow and affect the engine's performance. Therefore, the anti-icing system is necessary to ensure the smooth operation of the engine by preventing ice buildup on the fan inlet guide vane flaps.

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41.

(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 augmentor nozzle positioning indicator in the F100 monitoring system provides the operator with information about how much the augmentor nozzle is opened or closed, expressed as a percentage. This allows the operator to monitor and adjust the nozzle position as needed for optimal engine performance.

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42.

(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

Water will take four times longer to settle out of JP-8 than out of gasoline at room temperature.

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43.

(403) 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 system, the output is continuously monitored and compared to the desired input. Any deviation from the desired input is corrected through feedback control. This design allows the F100 UFC to constantly adjust and maintain the desired variables from the engine, ensuring optimal performance and efficiency.

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44.

(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 to flow in only one direction. It has a one-way flow design, which means that it prevents backflow and ensures that the fluid can only move in the desired direction. In this case, the check valve would permit oil flow in only one direction, making it the correct answer.

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45.

(407) 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 regulate the pressure within the gearbox by allowing excess pressure to be released. It is important for the breather pressurizing valve to be located in the gearbox to ensure proper functioning and to prevent any potential damage or malfunctioning of the engine components.

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46.

(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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47.

(408) 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 materials it comes into contact with. This is an important property for a journeyman to be aware of, as it can impact the maintenance and safety of the aircraft.

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48.

(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 containers of oil can lead to contamination and the oil can deteriorate over time. It is best to only use what is needed and properly dispose of the excess oil to maintain its quality and prevent any potential hazards.

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49.

(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

Through the use of spectrometric oil analysis, aircraft can detect potential issues early on, allowing for targeted maintenance and reducing the need for unnecessary maintenance. This means that only necessary maintenance tasks will be performed, resulting in less downtime and a higher in-commission rate for the aircraft.

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Volume 3 - 2014 CDC 2a651s Jet Aircraft

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

Quiz Preview

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

(417) The JFS is basically a

(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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

(418) On the F-15 secondary power system, what is used to stop the JFS starting cycle when the aircraft engine has accelerated to starter cutout speed?

(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

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

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

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

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

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

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

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

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

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