# 2A6X1 Vol. 3 Ure's (Mfe)

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Vol. 3 study guide

• 1.

### What is the coposition of JP8?

• A.

Gasoline and kerosene

• B.

Diesel fuel and kerosene

• C.

Diesel fuel and AV gas

• D.

Gasoline and diesel fuel

A. Gasoline and kerosene
Explanation
JP8 is a type of jet fuel used by the military. It is a blend of various hydrocarbon compounds, including gasoline and kerosene. Gasoline provides high energy density and improves the fuel's ignition characteristics, while kerosene helps to increase the fuel's flash point and stability. This combination allows JP8 to be used in a wide range of military aircraft and vehicles, providing efficient and reliable performance.

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• 2.

### At room temperature how many times longer does it take water to settle in JP8 than in gasoline?

• A.

1

• B.

2

• C.

4

• D.

5

C. 4
Explanation
Water takes 4 times longer to settle in JP8 than in gasoline at room temperature. This suggests that JP8 has a higher viscosity compared to gasoline. Viscosity is a measure of a fluid's resistance to flow, and higher viscosity fluids take longer to settle. Therefore, the answer of 4 indicates that JP8 is thicker and more resistant to flow than gasoline.

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• 3.

### The main fuel control allows the engine to safetly accelerate reducing the possibility of a

• A.

Flameout

• B.

Turbine seizure

• C.

Overtemp

• D.

Compressor shift

A. Flameout
Explanation
The main fuel control in an engine is responsible for regulating the fuel flow to the combustion chamber. By allowing the engine to safely accelerate, it ensures that the fuel-air mixture is properly balanced, reducing the possibility of a flameout. A flameout occurs when the flame in the combustion chamber is extinguished, causing the engine to stall. By preventing this, the main fuel control helps maintain the engine's stability and prevents potential damage or failure.

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• 4.

### The purpose of the fuel oil cooler is to

• A.

Heat the fuel and cool the oil

• B.

Heat the oil and cool the fuel

• C.

Heat the oil and heat the fuel

• D.

Cool the fuel and cool the oil

A. Heat the fuel and cool the oil
Explanation
The purpose of the fuel oil cooler is to heat the fuel and cool the oil. This is important because fuel needs to be heated in order to vaporize and combust efficiently, while oil needs to be cooled to prevent it from overheating and causing damage to the engine. By heating the fuel and cooling the oil, the fuel oil cooler helps to optimize the performance and longevity of the engine.

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• 5.

### Which type of fuel control uses items such as thermocouples, relays, amplifiers, and solinoids to help control a jet engine?

• A.

Pneumatic

• B.

Fuel injection

• C.

Hydromechanical

• D.

Hydroelectromechanical

D. Hydroelectromechanical
Explanation
Hydroelectromechanical fuel control systems utilize various components such as thermocouples, relays, amplifiers, and solenoids to regulate and control the fuel flow in a jet engine. These systems combine hydraulic and electrical mechanisms to ensure precise fuel delivery, maintaining the engine's performance and efficiency. The use of both hydraulic and electrical components allows for a more sophisticated and accurate control of the fuel flow, contributing to the smooth operation of the jet engine.

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• 6.

### On fuel controls that require setting during an engine trim , screws must be

• A.

Replaced

• B.

Dye marked

• C.

Safety sealed or lockwired

• D.

C. Safety sealed or lockwired
Explanation
In order to ensure that the fuel controls are properly set during engine trim, screws must be safety sealed or lockwired. This is done to prevent any unauthorized or accidental adjustments to the fuel controls, which could lead to potential safety hazards or engine malfunctions. Safety sealing or lockwiring the screws provides a visible indication that they have been properly set and prevents them from being tampered with without detection. This helps to maintain the integrity and reliability of the engine's fuel system.

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• 7.

### When in primary mode, what controls the operation of the F100 engine?

• A.

Mec

• B.

Pmg

• C.

Deec

• D.

Tsfc

C. Deec
Explanation
The DEEC (Digital Electronic Engine Control) controls the operation of the F100 engine when in primary mode. DEEC is responsible for monitoring and regulating various engine parameters such as fuel flow, temperature, and throttle position. It ensures optimal engine performance and efficiency by adjusting fuel mixture and other parameters based on the aircraft's demands.

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• 8.

### On the f100 engine, the MFC is capable of operating in how many modes

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
The MFC (Main Fuel Control) on the f100 engine is capable of operating in two modes.

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• 9.

### Which F100 engine fuel system component controls pressurization of the core engine fuel system?

• A.

N2 sensor

• B.

P&D valve

• C.

Fuel nozzle

• D.

Fan inlet sensor

B. P&D valve
Explanation
The P&D valve controls the pressurization of the core engine fuel system. It regulates the flow of fuel to maintain the desired pressure levels within the system. This valve ensures that the fuel is delivered at the correct pressure to the engine for efficient combustion and performance. The N2 sensor, fuel nozzle, and fan inlet sensor do not have a direct role in controlling the pressurization of the core engine fuel system.

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• 10.

### Which stage of compressor air drives the augmentor fuel pump on the F100 engine

• A.

7th

• B.

10th

• C.

13th

• D.

14th

C. 13th
Explanation
The augmentor fuel pump on the F100 engine is driven by the 13th stage of the compressor. This means that the pump is connected to and powered by the 13th stage of the compressor, which is responsible for compressing the air before it enters the combustion chamber. This stage is specifically designed to provide the necessary power to drive the augmentor fuel pump efficiently.

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• 11.

### On the F100 enigne, which component controls the augmentor fuel control?

• A.

Fuel pump

• B.

Fuel pump controller

• C.

Signature elimination probe

• D.

DEEC

D. DEEC
Explanation
The DEEC (Digital Electronic Engine Control) is the component that controls the augmentor fuel control on the F100 engine. It is a digital electronic system that monitors and adjusts various engine parameters to optimize performance and fuel efficiency. The DEEC receives inputs from sensors and makes real-time adjustments to the fuel flow, ensuring the correct amount of fuel is delivered to the augmentor for optimal thrust and combustion.

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• 12.

### Operational control of the F108 engine is acheived by the use of the power lever, fuel shutoff lever and

• A.

Fuel pump

• B.

Oil heat exchanger

• C.

Air fuel exchanger

• D.

PMC

D. PMC
Explanation
The operational control of the F108 engine is achieved by the use of the power lever, fuel shutoff lever, and PMC (Propulsion Management Computer). The power lever is used to control the engine's thrust, while the fuel shutoff lever is used to stop the flow of fuel to the engine. The PMC is responsible for monitoring and controlling various engine parameters such as fuel flow, temperature, and pressure, ensuring optimal performance and safety.

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• 13.

### The F108 engine fuel pump contains a low pressure stage ( centrifugal boost stage) and a high pressure...

• A.

Gear stage

• B.

Gerotor stage

• C.

Axial boost stage

• D.

Sliding vane stage

A. Gear stage
Explanation
The correct answer is gear stage. The F108 engine fuel pump contains a gear stage, which helps to increase the pressure of the fuel. Gear stages are commonly used in fuel pumps to provide a smooth and consistent flow of fuel at high pressures. They consist of meshing gears that rotate to create pressure and move the fuel through the pump. This design is efficient and reliable, making it suitable for high-pressure applications like aircraft engines.

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• 14.

### On the F108 engine the fuel injectors contain

• A.

Only primary fuel flow passages

• B.

Only secondary fuel flow passages

• C.

Both primary and secondary fuel flow passages

• D.

Primary, secondary, and auxiliary fuel flow passages

C. Both primary and secondary fuel flow passages
Explanation
The F108 engine's fuel injectors contain both primary and secondary fuel flow passages. This means that the injectors are designed to deliver fuel through two separate channels, allowing for more precise control of the fuel flow and combustion process. The primary fuel flow passages are responsible for delivering the main fuel supply, while the secondary passages provide additional fuel for optimal performance and efficiency. By having both primary and secondary passages, the F108 engine can ensure proper fuel delivery under varying operating conditions.

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• 15.

### What supplies the AE2100D3 FADEC with power untill the engine RPM is sufficient for the alternator stator  to take control?

• A.

Airplane 28 VDC power supply

• B.

NIU

• C.

MIL-STD-1553B data bus

• D.

Mission computer

A. Airplane 28 VDC power supply
Explanation
The AE2100D3 FADEC (Full Authority Digital Engine Control) is powered by the airplane's 28 VDC power supply until the engine RPM is sufficient for the alternator stator to take control. This means that initially, the power supply from the airplane is used to provide power to the FADEC system until the engine reaches the necessary RPM for the alternator stator to generate power and take over the control of supplying power to the FADEC.

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• 16.

### What component is controled by the AE2100D3 FADEC through the ENGINE START switch for normal engine shutdown or by the fire control handle for emergency shutdown

• A.

Servo valve

• B.

Fuel check vavle

• C.

Electric shutoff valve

• D.

Latching shutoff valve

D. Latching shutoff valve
Explanation
The latching shutoff valve is controlled by the AE2100D3 FADEC through the ENGINE START switch for normal engine shutdown or by the fire control handle for emergency shutdown. This valve is responsible for shutting off the fuel flow to the engine, ensuring that it stops running.

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• 17.

### In the T56 engine how many and what type of fuel pumps are contained in the fuel pump

• A.

3 gear 1 boost

• B.

2 gear 2 boost

• C.

2 gear 1 boost

• D.

1 gear 2 boost

C. 2 gear 1 boost
Explanation
The T56 engine contains two gear fuel pumps and one boost fuel pump.

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• 18.

### What T56  engin controls the rotary movement of the fuel control metering vavle

• A.

Temperature

• B.

Engine speed

• C.

Throttle position

• D.

Compressor inlet pressure

D. Compressor inlet pressure
Explanation
The compressor inlet pressure controls the rotary movement of the fuel control metering valve in the T56 engine. This is because the compressor inlet pressure directly affects the amount of air entering the engine, which in turn affects the fuel-air mixture ratio. By adjusting the fuel control metering valve based on the compressor inlet pressure, the engine can maintain the optimal fuel-air mixture for efficient combustion and performance.

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• 19.

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

• A.

TD valve

• B.

Speed sensitive control

• C.

TD potentiometers

• D.

TD amplifier

D. TD amplifier
Explanation
The TD amplifier compares the desired throttle setting from the coordinator with the actual TIT signal from the thermocouples. It amplifies the signal and sends it to the fuel control unit to adjust the fuel flow accordingly.

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• 20.

### Which T56 engine component sends the fuel to the fuel manifold?

• A.

TD valve

• B.

Main fuel pump

• C.

TD amplifier

• D.

Fuel control

A. TD valve
Explanation
The TD valve is the component that sends the fuel to the fuel manifold in the T56 engine.

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• 21.

### When the null orifice on the T56 engine TD valve is set to zero, how much fuel will the valve bypass?

• A.

0%

• B.

10%

• C.

20%

• D.

30%

C. 20%
Explanation
When the null orifice on the T56 engine TD valve is set to zero, it means that there is no bypass of fuel through the valve. Therefore, the valve will not bypass any fuel, resulting in 0% bypass.

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• 22.

### In addition to the visual inspection the T56 engine fuel nozzle also requires what type of inspection

• A.

Nondestructive

• B.

Spray pattern

• C.

Pre-torque

• D.

Ultrasonic

B. Spray pattern
Explanation
The T56 engine fuel nozzle requires a spray pattern inspection in addition to visual inspection. This means that apart from visually inspecting the nozzle, it is also necessary to check the pattern in which the fuel is sprayed. This inspection ensures that the fuel is being distributed evenly and in the correct pattern, which is crucial for the efficient functioning of the engine.

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• 23.

### Which type of oil cooler operates on the ame principles as a car radiator

• A.

Air

• B.

Fuel

• C.

Hydraulic

• D.

Pneumatic

A. Air
Explanation
An air oil cooler operates on the same principles as a car radiator. Both the air oil cooler and car radiator use air as the medium to cool down the fluid passing through them. In the case of a car radiator, air is used to cool the engine coolant, while in an air oil cooler, air is used to cool the oil. Both systems work by allowing air to flow through a series of fins or tubes, which dissipates the heat from the fluid, thus cooling it down. Therefore, the correct answer is air.

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• 24.

### When an engine is not operating, static preload for a carbon seal is provided by

• A.

Air pressure

• B.

Spring pressure

• C.

Oil pressure

• D.

Hydraulic pressure

B. Spring pressure
Explanation
When an engine is not operating, static preload for a carbon seal is provided by spring pressure. This means that the carbon seal is compressed and held in place by a spring, ensuring a tight seal between two components. The spring pressure helps to maintain the integrity of the seal even when there is no air, oil, or hydraulic pressure present.

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• 25.

### The F100 engine oil pressure varies with N2 speed, engine inlet oil temperature, and

• A.

Oil jet pressure

• B.

Fan turbine speed

• C.

Oil nozzle condition

• D.

Number of oil jets used

C. Oil nozzle condition
Explanation
The oil nozzle condition affects the F100 engine oil pressure. The condition of the oil nozzle, which is responsible for delivering oil to the engine, can impact the pressure of the oil. If the oil nozzle is damaged or clogged, it may restrict the flow of oil, resulting in lower oil pressure. On the other hand, if the oil nozzle is in good condition, it will allow for proper oil flow, leading to optimal oil pressure. Therefore, the oil nozzle condition is a crucial factor in determining the oil pressure of the F100 engine.

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• 26.

### What term is used to indicated that air is being mixed with the oil in the oil pump to creat pockets of air

• A.

Aeration

• B.

Induction

• C.

Convestion

• D.

Compression

A. Aeration
Explanation
Aeration is the correct term used to indicate that air is being mixed with the oil in the oil pump to create pockets of air. Aeration occurs when air bubbles are introduced into the oil, leading to a decrease in the oil's lubricating properties and potential damage to the system. This can happen due to various reasons such as foaming, cavitation, or inadequate oil supply.

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• 27.

### In the engine oil tank, which device seperates the air from the oil

• A.

Aeration

• B.

Deaeration

• C.

Check vavle

• D.

Bypass valve

B. Deaeration
Explanation
The device that separates the air from the oil in the engine oil tank is called a deaeration device. This device is specifically designed to remove any air or gas bubbles that may have entered the oil, ensuring that only pure oil is circulated through the engine. By removing the air, the deaeration device helps to prevent foaming or cavitation, which can lead to reduced lubrication efficiency and potential damage to the engine components.

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• 28.

### Which type of oil system stores the oil in a tank fitted to the side the engine

• A.

Wet sump

• B.

Dry sump

• C.

Hot tank

• D.

Cold tank

B. Dry sump
Explanation
A dry sump oil system stores the oil in a separate tank that is not attached to the engine. This type of system is commonly used in high-performance or racing engines where the engine is subjected to high G-forces or extreme angles of operation. By storing the oil in a separate tank, it allows for better control over oil levels and prevents oil starvation during high-speed or aggressive driving conditions. The oil is pumped from the tank to lubricate the engine components and then returned to the tank for cooling and filtering before being recirculated.

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• 29.

### which type of oil system design places the oil cooler in the pressure subsystem?

• A.

Wet tank

• B.

Dry tank

• C.

Hot tank

• D.

Cold tank

C. Hot tank
Explanation
In a hot tank oil system design, the oil cooler is placed in the pressure subsystem. This design allows the oil to be cooled while under pressure, which helps to maintain optimal operating temperatures and prevent overheating. By placing the oil cooler in the pressure subsystem, the oil is cooled more efficiently, ensuring that it can effectively lubricate and protect the engine or machinery it is used in.

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• 30.

### On the F100 engine, the breather pressurizing valve is internally mounted in the

• A.

Oil tank

• B.

Gearbox

• C.

Oil filter

• D.

Oil pump

B. Gearbox
Explanation
The breather pressurizing valve on the F100 engine is internally mounted in the gearbox. This means that it is located within the gearbox itself, rather than in the oil tank, oil filter, or oil pump. The purpose of the breather pressurizing valve is to regulate the pressure within the gearbox, ensuring that it remains at an optimal level for proper functioning. By being internally mounted in the gearbox, the valve can directly monitor and control the pressure within the gearbox, leading to efficient and effective operation of the engine.

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• 31.

### Which type of oil pump is used on the T56 engine

• A.

Gear

• B.

Float

• C.

Gerotor

• D.

Centrifulgal

A. Gear
Explanation
The T56 engine uses a gear oil pump. Gear oil pumps are commonly used in engines as they are efficient and reliable. They consist of two gears that mesh together and create a pumping action to move the oil. This type of pump is capable of generating high pressures and is suitable for heavy-duty applications like aircraft engines.

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• 32.

### The amount of Ram air passing through the oil cooler core is regulated by the

• A.

Thermostat

• B.

Flap actuator

• C.

Size of the core

• D.

Regulating valve

B. Flap actuator
Explanation
The correct answer is flap actuator. The flap actuator is responsible for regulating the amount of Ram air passing through the oil cooler core. It controls the opening and closing of the flap, which in turn adjusts the airflow. By adjusting the flap position, the flap actuator ensures that the appropriate amount of air is directed through the oil cooler core to maintain optimal cooling of the oil.

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• 33.

### On an F100 engine , the air/oil coolers are mounted on the fan duct and use

• A.

Secondary fan airflow as a coolant

• B.

Secondary fan airflow as an oil heater

• C.

Primary core engine airflow as a coolant

• D.

Primary core engine airflow as an oil heater

A. Secondary fan airflow as a coolant
Explanation
The air/oil coolers on an F100 engine are mounted on the fan duct and use the secondary fan airflow as a coolant. This means that the coolers are positioned in a way that allows the air from the secondary fan to pass through them, cooling down the oil. This is important because the oil in the engine needs to be kept at a certain temperature to ensure proper lubrication and prevent overheating. Using the secondary fan airflow as a coolant helps maintain the optimal temperature for the oil, ensuring the engine operates efficiently.

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• 34.

### on the F100 engine, what component permits oil to bypass the filter during cold weather starts

• A.

Oil relief valve

• B.

Filter bypass valve

• C.

Filter poppet valve

• D.

Oil pressure transmitter tap

B. Filter bypass valve
Explanation
The filter bypass valve is the component on the F100 engine that permits oil to bypass the filter during cold weather starts. This valve allows oil to flow directly to the engine without passing through the filter, ensuring that the engine receives sufficient lubrication during startup when the oil is cold and thick. By bypassing the filter, the valve prevents any potential blockages or restrictions that may occur due to the cold oil, ensuring smooth engine operation during cold weather conditions.

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• 35.

### What is used to check the oil level in a F108 engine

• A.

Sight gauge on the oil tank

• B.

Flight station oil level gauge

• C.

Filler cap with a graduated gauge

• D.

Graduated marking on the outside of the tank

C. Filler cap with a graduated gauge
Explanation
The correct answer is "filler cap with a graduated gauge". In an F108 engine, the oil level can be checked using the filler cap, which has a graduated gauge. This gauge allows the user to visually determine the oil level by observing the markings on the gauge. The filler cap is a convenient and accessible location to check the oil level without the need for additional tools or equipment.

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• 36.

### Aproximatly how many GPM does the AE2100D3 PUAD lube and scavange pump provide at engine PTO

• A.

3

• B.

5

• C.

7

• D.

9

B. 5
Explanation
The AE2100D3 PUAD lube and scavange pump provides approximately 5 gallons per minute (GPM) at engine PTO.

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• 37.

### What AE2100D3 component drives the PGB lube and scavange pump?

• A.

Alternator stator

• B.

PGB

• C.

• D.

Explanation
The GMAD (Gearbox Mounted Accessory Drive) component drives the PGB (Power Gearbox) lube and scavange pump.

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• 38.

### Bleed air flowing through which component increases air flow through the cooler?

• A.

Flap actuator

• B.

Oil cooler flap

• C.

Augmentation valve

• D.

Augmentation ejector

D. Augmentation ejector
Explanation
The augmentation ejector increases air flow through the cooler when bleed air is flowing through it.

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• 39.

### the valve that allows fluid to flow in only one direction is the

• A.

Check

• B.

Relief

• C.

Bypass

• D.

Pressurizing

A. Check
Explanation
The valve that allows fluid to flow in only one direction is called a check valve. This valve is designed to prevent backflow and ensure that fluid can only flow in a single direction. It is commonly used in plumbing systems and other applications where the reversal of fluid flow could cause damage or disruption. The check valve typically consists of a flap or a ball that opens when fluid flows in the correct direction and closes to block the flow when there is reverse pressure.

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• 40.

### in the power unit oil system, the dual port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the

• A.

Mid and center sleeve bearings

• B.

Torque meter and compressor front bearings

• C.

Front and rear sides of the compressor rear bearing

• D.

Front and rear sides of the compressor front bearing

A. Mid and center sleeve bearings
Explanation
The dual port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the mid and center sleeve bearings. This means that the oil jet sprays oil onto these specific bearings, ensuring that they are properly lubricated and reducing friction between the moving parts. Proper lubrication is important to prevent wear and damage to the bearings, allowing them to function smoothly and efficiently.

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• 41.

### The power section and RGB oil systems are joined together at the

• A.

Fuel heater and strainer

• B.

External scavenge oil filter

• C.

External scavenge oil pump

• D.

Scavenge element of the main pump

B. External scavenge oil filter
Explanation
The power section and RGB oil systems are joined together at the external scavenge oil filter. This filter is responsible for removing any impurities or contaminants from the oil before it is circulated back into the system. By filtering the oil, it helps to ensure that the power section and RGB oil systems are supplied with clean and high-quality oil, which is crucial for their proper functioning.

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• 42.

### Which RGB component prevents oil in the oil tank from draining into the RGB rear case?

• A.

Shutoff valve

• B.

Oil pump and filter

• C.

Oil pump check valve

• D.

Oil pump bypass valve

C. Oil pump check valve
Explanation
The oil pump check valve prevents oil in the oil tank from draining into the RGB rear case. This valve ensures that oil flows in one direction only, preventing any backflow or leakage into the RGB rear case. By maintaining the oil in the oil tank, it ensures proper lubrication and functioning of the RGB system.

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• 43.

### How many scavange oil pumps are located in the RGB

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
There are two scavange oil pumps located in the RGB.

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• 44.

### The Journeyman must be aware of which hazardous property of modern jet engine oil

• A.

Toxcicity

• B.

Viscosity

• C.

Alkalinity

• D.

Corrosiveness

D. Corrosiveness
Explanation
The Journeyman must be aware of the corrosiveness of modern jet engine oil. This is because corrosiveness refers to the ability of a substance to cause damage or deterioration to materials it comes into contact with. In the case of jet engine oil, corrosiveness can lead to the degradation of engine components and potentially result in malfunctions or failures. Therefore, understanding the corrosive properties of the oil is crucial for the Journeyman to ensure the safe and efficient operation of the jet engine.

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• 45.

### the primary benefit of identifying an impending failure through OAP is

• A.

Improved safety

• B.

Increased component life

• C.

Reduced maintenance cost

• D.

Increased equipment availability

A. Improved safety
Explanation
The primary benefit of identifying an impending failure through OAP is improved safety. By detecting potential failures before they occur, necessary maintenance or repairs can be performed in a timely manner, preventing accidents or malfunctions that could jeopardize the safety of personnel or equipment. This proactive approach helps to minimize risks and ensure a safer working environment.

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• 46.

### Who is responsible for ensuring that the OAP operates properly

• A.

Project monitor

• B.

Logistics commander

• C.

Propulsion flight chief

• D.

Laboratory supervisor

A. Project monitor
Explanation
The project monitor is responsible for ensuring that the OAP (Operating Airfield Pavement) operates properly. They oversee the project and monitor its progress, making sure that all aspects of the OAP are functioning correctly. This includes coordinating with various teams and personnel involved in the project, ensuring that all necessary resources and equipment are available, and addressing any issues or challenges that may arise during the operation. The project monitor plays a crucial role in ensuring the successful operation of the OAP.

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• 47.

### What are microscopic metallic particles in the oil system called?

• A.

Wear metals

• B.

Friction metals

• C.

Precious metals

• D.

Transformation metals

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 components in the machinery. Over time, these wear metals can cause damage to the equipment, leading to reduced performance and potential breakdowns. Therefore, monitoring and analyzing the presence of wear metals in the oil system is crucial for preventive maintenance and ensuring the longevity of the machinery.

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• 48.

### Oil sampling intervals should not vary by more than

• A.

5 %

• B.

10 %

• C.

15 %

• D.

20 %

B. 10 %
Explanation
Oil sampling intervals should not vary by more than 10%. This means that the time between each oil sample should not deviate more than 10% from the average interval. Maintaining consistent oil sampling intervals is important because it allows for accurate monitoring of the oil's condition and helps to detect any potential issues or abnormalities in the machinery. Deviating too much from the average interval can result in unreliable data and may lead to missed maintenance opportunities or unnecessary repairs.

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• 49.

### The SEM/EDX analysis process differs from the conventional oil analysis in which major aspect

• A.

Samples must be sent off-site for analysis

• B.

Particles must be free of oil for analysis to take place

• C.

Provides results concerning equipment and components condition

• D.

Samples can only be obtained in an intermediate maintenance shop

B. Particles must be free of oil for analysis to take place
Explanation
SEM/EDX analysis is a technique used to analyze the composition of materials. Unlike conventional oil analysis, where samples need to be sent off-site for analysis, SEM/EDX analysis can be performed on-site. One major aspect that differentiates SEM/EDX analysis from conventional oil analysis is that particles must be free of oil for analysis to take place. This means that the particles being analyzed should not have any oil coating on their surface, as it can interfere with the accurate analysis of their composition. By ensuring that particles are free of oil, SEM/EDX analysis can provide reliable results concerning the condition of equipment and components.

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• 50.

### What is the term for the process of producing voltage in a conductor when it passes through a magnectic feild

• A.

Static

• B.

Electronics

• C.

Mutual induction

• D.

Electromagnetic induction

D. 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 generators and transformers. When a conductor moves through a magnetic field or when the magnetic field around a conductor changes, it induces an electric current in the conductor. This is the principle behind the generation of electricity in power plants and the functioning of many electrical devices.

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