CDC 2a651s Volume 3 By CDCmaster
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Questions and Answers
- 1.
What is the composition of JP-8 fuel?
- A.
Gasoline and kerosene
- B.
Gasoline and diesel fuel
- C.
Diesel fuel and kerosene
- D.
Diesel fuel and aviation gasoline
Correct Answer
A. Gasoline and keroseneExplanation
JP-8 fuel is a type of jet fuel commonly used by the military. It is a mixture of gasoline and kerosene. Gasoline provides high energy content and helps in starting the engine, while kerosene provides stability and lubrication. This combination allows JP-8 fuel to have a higher flash point and lower freezing point compared to regular gasoline, making it suitable for use in military aircraft operating in various climates and conditions.Rate this question:
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- 2.
At room temperature, how many times longer will it take water to settle out of JP-8 than out of gasoline?
- A.
Two
- B.
Three
- C.
Four
- D.
Five
Correct Answer
C. FourExplanation
At room temperature, it will take water four times longer to settle out of JP-8 than out of gasoline. This suggests that JP-8 has a higher viscosity compared to gasoline, which means it is thicker and flows more slowly. Therefore, it takes more time for the water to separate and settle out of JP-8 compared to gasoline.Rate this question:
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- 3.
Jet aircraft operating at moderately high altitudes increase the fuel system's susceptibility to an icing condition, further aggravated by the
- A.
Lower viscosity of jet fuels
- B.
Higher viscosity of jet fuels
- C.
Lower viscosity of free water
- D.
Higher viscosity of free water
Correct Answer
B. Higher viscosity of jet fuelsExplanation
Jet aircraft operating at moderately high altitudes increase the fuel system's susceptibility to an icing condition. The higher viscosity of jet fuels contributes to this increased susceptibility. When the fuel has a higher viscosity, it is thicker and less likely to flow freely. This can lead to the formation of ice crystals or ice particles in the fuel system, which can block fuel lines or clog filters. These ice formations can disrupt the fuel flow, potentially causing engine failure or other operational issues. Therefore, the higher viscosity of jet fuels can worsen the icing condition in the fuel system of jet aircraft operating at moderately high altitudes.Rate this question:
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- 4.
The main fuel control allows the jet engine to safely accelerate, reducing the possibility of
- A.
Flameout
- B.
Turbine seizure
- C.
Compressor shift
- D.
Overtemperature
Correct Answer
A. FlameoutExplanation
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.Rate this question:
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- 5.
During a visual inspection, how can you tell when a fuel filter is clogged?
- A.
A green flag pops out of the filter
- B.
Fuel pressure from the fuel pump is low
- C.
A differential pressure indicator is actuated
- D.
There is no way to tell without disassembling the filter
Correct Answer
C. A differential pressure indicator is actuatedExplanation
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.Rate this question:
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- 6.
On a dual spool, axial-flow engine, what controls thrust production of the engine?
- A.
Regulating engine RPM
- B.
Regulating compressor discharge pressure
- C.
Controlling turbine exhaust pressure
- D.
Controlling turbine inlet temperature
Correct Answer
D. Controlling turbine inlet temperatureExplanation
The correct answer is controlling turbine inlet temperature. In a dual spool, axial-flow engine, the turbine inlet temperature is a critical factor in determining the engine's thrust production. By controlling the temperature of the air entering the turbine, the engine can regulate the amount of energy extracted from the combustion process, which in turn affects the thrust output. This is typically achieved through the use of a fuel control system that adjusts the fuel flow rate to maintain the desired turbine inlet temperature.Rate this question:
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- 7.
During jet engine deceleration, a hydromechanical fuel control schedules fuel flow as a function of
- A.
RPM
- B.
Inlet temperature
- C.
Burner pressure
- D.
Inlet pressure
Correct Answer
C. Burner pressureExplanation
During jet engine deceleration, the hydromechanical fuel control system adjusts the fuel flow based on the burner pressure. Burner pressure is an important parameter that indicates the combustion efficiency and the demand for fuel. By monitoring the burner pressure, the fuel control system can regulate the fuel flow to maintain the desired engine performance and prevent any potential damage or instability. The other options, RPM, inlet temperature, and inlet pressure, may also affect the fuel flow, but burner pressure is specifically related to the combustion process and is therefore the most relevant factor in this context.Rate this question:
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- 8.
What type of fuel control uses items such as thermocouples, relays, amplifiers, and solenoids to help control a jet engine?
- A.
Pneumatic
- B.
Fuel injection
- C.
Hydromechanical
- D.
Electrohydromechanical
Correct Answer
D. ElectrohydromechanicalExplanation
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.Rate this question:
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- 9.
Which term describes a jet engine fuel metering device that is really two fuel controls in one component?
- A.
Unified
- B.
Combined
- C.
Biomechanical
- D.
Electrosecondary
Correct Answer
A. UnifiedExplanation
A jet engine fuel metering device that is really two fuel controls in one component is referred to as "Unified." This term suggests that the device combines the functions of two separate fuel controls into a single component, simplifying the design and operation of the engine's fuel system.Rate this question:
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- 10.
The F100 UFC senses certain variables from the engine through the use of
- A.
A closed loop design
- B.
An open circuit design
- C.
The feedback control unit
- D.
A direct mechanical connection to all engine sensors
Correct Answer
A. A closed loop designExplanation
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.Rate this question:
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- 11.
If the safety seals on a fuel system component are broken or removed, and you suspect the factory adjustment was altered, you should
- A.
Adjust and reseal the component
- B.
Keep the component in service to meet the mission
- C.
Forward the component to he authorized depot for reflow and resealing
- D.
Continue to keep the component in service if it is documented as a red diagonal on Form 781A, Hydromechanical Fuel Control
Correct Answer
C. Forward the component to he authorized depot for reflow and resealingExplanation
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.Rate this question:
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- 12.
Calibration and/or adjustment screws that require setting during an engine trim procedure must be
- A.
Replaced
- B.
Die marked
- C.
Safety sealed and/or lockwired
- D.
Treated with a thread locking compound
Correct Answer
C. Safety sealed and/or lockwiredExplanation
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.Rate this question:
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- 13.
When in the primary mode, what controls the operation of the F100-PW-220 engine?
- A.
MEC
- B.
PMG
- C.
TSFC
- D.
DEEC
Correct Answer
D. DEECExplanation
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.Rate this question:
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- 14.
On an F100-PW-220 engine, the DEEC is cooled by
- A.
Oil
- B.
Fuel
- C.
Ram air
- D.
Hydraulic fluid
Correct Answer
B. FuelExplanation
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.Rate this question:
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- 15.
For actuation of the variable vane systems on an F100-PW220 engine, the MFC provides both the CIVV and
- A.
Rear compressor variable vane actuators with pneumatic (air) pressure
- B.
Rear compressor variable vane actuators with fuel pressure
- C.
Variable exhaust nozzle actuators with pneumatic pressure
- D.
Variable exhaust nozzle actuators with fuel pressure
Correct Answer
B. Rear compressor variable vane actuators with fuel pressureExplanation
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.Rate this question:
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- 16.
Which F100-PW-220 engine fuel system component controls pressurization of the core engine fuel system?
- A.
Fuel nozzle
- B.
P&D valve
- C.
N2 sensor
- D.
Tt 2.5 sensor
Correct Answer
B. P&D valveExplanation
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.Rate this question:
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- 17.
Which stage of compressor air drives the augmenter fuel pump on an F100-PW-220 engine?
- A.
7th
- B.
10th
- C.
13th
- D.
14th
Correct Answer
C. 13thExplanation
The augmenter fuel pump on an F100-PW-220 engine is driven by the 13th stage of the compressor.Rate this question:
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- 18.
On the F100-PW-220 engine, which component controls the augmenter fuel control?
- A.
Fuel pump
- B.
Fuel pump controller
- C.
Signature elimination probe
- D.
DEEC
Correct Answer
D. DEECExplanation
The DEEC (Digital Electronic Engine Control) is the component that controls the augmenter fuel control on the F100-PW-220 engine. The DEEC is responsible for monitoring and adjusting various engine parameters, including fuel flow, to optimize engine performance. It receives input from sensors and uses algorithms to regulate the augmenter fuel control, ensuring the correct amount of fuel is delivered for efficient engine operation.Rate this question:
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- 19.
Core engine fuel flow sequence on an F100-PW-220 engine starts at the main fuel pump and then goes through the
- A.
AFP, AFC fuel/oil cooler, P&D, and fuel nozzles
- B.
MFC, fuel/oil cooler, P&D, and fuel nozzles
- C.
AFC,AFP, fuel/oil cooler, P&D, and fuel nozzles
- D.
Fuel/oil cooler, P&D, MFC, and fuel nozzles
Correct Answer
B. MFC, fuel/oil cooler, P&D, and fuel nozzlesExplanation
The correct answer is MFC, fuel/oil cooler, P&D, and fuel nozzles. This sequence is the correct order in which the fuel flow occurs in the core engine of an F100-PW-220 engine. The fuel starts at the main fuel control (MFC), then goes through the fuel/oil cooler, the P&D (primary and dump) valves, and finally reaches the fuel nozzles. This sequence ensures that the fuel is properly cooled and regulated before being injected into the engine for combustion.Rate this question:
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- 20.
When classified as to structure, which of the following is not a type of an oil pump?
- A.
Gear
- B.
Gerotor
- C.
Rotogear
- D.
Sliding vane
Correct Answer
C. RotogearExplanation
The question asks for a type of oil pump that is not classified based on structure. The options given are gear, gerotor, rotogear, and sliding vane. Both gear and gerotor are types of oil pumps that are classified based on structure. Sliding vane is also a type of oil pump that is classified based on structure. Therefore, the correct answer is rotogear, as it is not a recognized type of oil pump when classified based on structure.Rate this question:
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- 21.
Which type of oil pump consists of a gear and rotor within a housing?
- A.
Gear
- B.
Gerotor
- C.
Rotogear
- D.
Sliding vane
Correct Answer
B. GerotorExplanation
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.Rate this question:
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- 22.
One micron is a metric linear measurement that is equal to
- A.
1/25 inch
- B.
1/250 inch
- C.
1/2500 inch
- D.
1/25000 inch
Correct Answer
D. 1/25000 inchExplanation
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.Rate this question:
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- 23.
Chip detectors have an electrical connection for making which type of check?
- A.
AC high-voltage
- B.
DC high voltage
- C.
Continuity
- D.
Polarity
Correct Answer
C. ContinuityExplanation
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.Rate this question:
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- 24.
Which type of valve permits oil flow in only one direction?
- A.
Check
- B.
Relief
- C.
Bypass
- D.
Pressurizing
Correct Answer
A. CheckExplanation
A check valve is a type of valve that allows fluid (in this case, oil) to flow in only one direction. It has a one-way flow design, which means that it allows oil to pass through it in one direction while preventing backflow in the opposite direction. This ensures that the oil flows in the desired direction and prevents any potential damage or issues that could arise from reverse flow.Rate this question:
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- 25.
Which type of oil cooler operates on the same principle as a radiator in an automobile?
- A.
Air/oil
- B.
Fuel
- C.
Hydraulic
- D.
Pneumatic
Correct Answer
A. Air/oilExplanation
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.Rate this question:
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- 26.
The purpose of an oil-temperature control valve used with air/oil coolers is to
- A.
Control the oil poppet valve
- B.
Direct oil around the fuel filter
- C.
Control oil exiting from the cooler
- D.
Direct oil around or through the cooler
Correct Answer
D. Direct oil around or through the coolerExplanation
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.Rate this question:
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- 27.
What type of oil seal has soft metal as its basic composition and allows a small amount of airflow to prevent oil seepage?
- A.
Silicone
- B.
Carbon
- C.
Synthetic
- D.
Labyrinth
Correct Answer
D. LabyrinthExplanation
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.Rate this question:
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- 28.
Use extreme care when working with labyrinth seals because of their
- A.
Soft metal construction; these seals can be damaged easily
- B.
Soft metal construction; they are sharp and can cut your hand
- C.
Hard metal construction; they are sharp and can cut your hand
- D.
Hard metal construction; these seals can damage the bearing races
Correct Answer
A. Soft metal construction; these seals can be damaged easilyExplanation
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.Rate this question:
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- 29.
When an engine is not operating, static preload for a carbon oil seal is provided by
- A.
Air pressure
- B.
Oil pressure
- C.
Spring pressure
- D.
Hydraulic pressure
Correct Answer
C. Spring pressureExplanation
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.Rate this question:
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- 30.
Carbon seals should be cleaned by soaking them in clean, warm
- A.
JP-4 for 60 minutes
- B.
PD-680 for 30 minutes
- C.
Kerosene for 60 minutes
- D.
Engine lubricating oil for 30 minutes
Correct Answer
D. Engine lubricating oil for 30 minutesExplanation
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.Rate this question:
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- 31.
The F100-PW-100 engine oil pressure varies with N2, engine inlet oil temperature, and
- A.
Oil jet pressure
- B.
Fan turbine speed
- C.
Oil nozzle condition
- D.
Number of oil jets used
Correct Answer
C. Oil nozzle conditionExplanation
The F100-PW-100 engine oil pressure varies with the condition of the oil nozzle. The oil nozzle is responsible for delivering oil to various parts of the engine, including the fan turbine. If the oil nozzle is damaged or clogged, it can affect the flow of oil and subsequently the oil pressure. Therefore, the condition of the oil nozzle plays a crucial role in determining the oil pressure of the F100-PW-100 engine.Rate this question:
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- 32.
What term is used to indicate that air is being mixed with the oil in the oil pump to create pockets of air?
- A.
Aeration
- B.
Induction
- C.
Convection
- D.
Compression
Correct Answer
A. AerationExplanation
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.Rate this question:
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- 33.
The number 1, 4, and 5 bearing compartments are capped on the F100-PW-100 engine oil system. Which oil subsystem (or subsystems) do these compartments breath through?
- A.
Scavenge only
- B.
Breather only
- C.
Scavenge and pressure
- D.
Scavenge and breather
Correct Answer
A. Scavenge onlyExplanation
The number 1, 4, and 5 bearing compartments are capped on the F100-PW-100 engine oil system, which means they do not have a breather. Therefore, these compartments can only breathe through the scavenge subsystem.Rate this question:
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- 34.
Which type of oil system stores the oil in a tank fitted to the side of the engine?
- A.
Dry sump
- B.
Wet sump
- C.
Cold tank
- D.
Hot tank
Correct Answer
A. Dry sumpExplanation
A dry sump oil system stores the oil in a separate tank that is mounted to the side of the engine. This type of system is commonly used in high-performance and racing engines. The oil is pumped from the tank to lubricate the engine components and then returned to the tank to be cooled and filtered before being recirculated. This design allows for a larger oil capacity, better oil control, and improved engine performance under high-speed or high-g-force conditions. In contrast, a wet sump oil system stores the oil in a pan located at the bottom of the engine.Rate this question:
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- 35.
Which type of oil system design places the oil cooler in the pressure subsystem?
- A.
Cold tank
- B.
Wet tank
- C.
Dry tank
- D.
Hot tank
Correct Answer
D. Hot tankExplanation
A hot tank oil system design places the oil cooler in the pressure subsystem. This means that the oil cooler is located in a section of the system where the oil is under pressure. This design allows for efficient cooling of the oil as it circulates through the system, ensuring that the oil remains at the desired temperature and viscosity. This is particularly important in high-performance or heavy-duty applications where the oil can become hot due to the increased workload.Rate this question:
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- 36.
Which type of oil tank design do most fighter aircraft engines incorporate to help with weight savings?
- A.
Wet tank
- B.
Dry tank
- C.
Hot tank
- D.
Cold tank
Correct Answer
C. Hot tankExplanation
Most fighter aircraft engines incorporate a hot tank design to help with weight savings. A hot tank design allows for the engine oil to be heated to a higher temperature, which reduces its viscosity and improves its flow characteristics. This enables the engine to operate more efficiently and reduces the need for additional oil cooling systems, thus saving weight.Rate this question:
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- 37.
On an F100 engine, the breather pressurizing valve is internally mounted in the
- A.
Oil tank
- B.
Gearbox
- C.
Oil filter
- D.
Oil pump
Correct Answer
B. GearboxExplanation
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.Rate this question:
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- 38.
If the red button on an F100-PW-220 engine oil filter pops out and remains extended, the
- A.
Button is defective
- B.
Scheduled oil change is due
- C.
Design ambient pressure has been exceeded
- D.
Design pressure differential has been exceeded
Correct Answer
D. Design pressure differential has been exceededExplanation
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.Rate this question:
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- 39.
On an F100-PW-220 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
Correct Answer
A. Secondary fan airflow as a coolantExplanation
The air/oil coolers on an F100-PW-220 engine are mounted on the fan duct and use the secondary fan airflow as a coolant. This means that the coolers are designed to extract heat from the oil by passing the secondary fan airflow over them, cooling the oil in the process. The primary core engine airflow is not used as a coolant or oil heater in this case.Rate this question:
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- 40.
On an F100-PW-220 engine, what component permits oil to bypass the oil filter during cold weather starts?
- A.
Oil relief valve
- B.
Filter poppet valve
- C.
Oil pressure transmitter tap
- D.
Filter assembly bypass valve
Correct Answer
D. Filter assembly bypass valveExplanation
The correct answer is the Filter assembly bypass valve. During cold weather starts, the oil filter may become clogged with thick oil, which can restrict oil flow to the engine. The filter assembly bypass valve allows oil to bypass the filter, ensuring that the engine receives an adequate oil supply during start-up. This helps to prevent engine damage and ensures proper lubrication during cold weather conditions.Rate this question:
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- 41.
On an F100-PW-220 engine, which bearing compartments drain into the gearbox by the tower shaft cavity?
- A.
1 and 2
- B.
1 and 3
- C.
2 and 3
- D.
2 and 4
Correct Answer
C. 2 and 3Explanation
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.Rate this question:
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- 42.
How does the AFTLA obtain oil samples for analysis?
- A.
Upon request from the depot
- B.
Automatically from the depot
- C.
Upon request from the manufacturer
- D.
Automatically from the manufacturer
Correct Answer
D. Automatically from the manufacturerExplanation
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.Rate this question:
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- 43.
The hazardous property of modern jet engine oil the journeyman must be aware of is
- A.
Toxicity
- B.
Viscosity
- C.
Alkalinity
- D.
Corrosiveness
Correct Answer
D. CorrosivenessExplanation
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.Rate this question:
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- 44.
Which action concerning open oil containers is correct?
- A.
Dispose of any portion not immediately used
- B.
Store remaining portion immediately after use
- C.
Dispose of any portion not used within 60 days
- D.
Store remaining portion in clearly marked containers
Correct Answer
A. Dispose of any portion not immediately usedExplanation
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.Rate this question:
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- 45.
Through the use of spectrometric oil analysis, aircraft will have a higher in-commission rate because there will be
- A.
More oil sampling
- B.
More engine removals
- C.
Less unnecessary maintenance
- D.
Less wear metal found in the oil
Correct Answer
C. Less unnecessary maintenanceExplanation
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.Rate this question:
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- 46.
For bases that do not have an OAP laboratory, who designates the facility to which oil samples are sent?
- A.
Base commander
- B.
Unit commander
- C.
Program manager
- D.
Unit safety officer
Correct Answer
C. Program managerExplanation
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.Rate this question:
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- 47.
Who is responsible for ensuring that the OAP operates properly?
- A.
Project monitor
- B.
Logistics commander
- C.
Propulsion flight chief
- D.
Laboratory supervisor
Correct Answer
A. Project monitorExplanation
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.Rate this question:
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- 48.
What are microscopic metallic particles in the oil system called?
- A.
Wear metals
- B.
Friction metals
- C.
Precious metals
- D.
Transformation metals
Correct Answer
A. Wear metalsExplanation
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.Rate this question:
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- 49.
Increased friction between moving parts in the oil system
- A.
Accelerates the rear of wear, decreasing the production of wear metal particles
- B.
Accelerates the rate of wear, increasing the production of wear metal particles
- C.
Slows the rate of wear, decreasing the production of wear metal particles
- D.
Slows the rate of wear, increasing the production of wear metal particles
Correct Answer
B. Accelerates the rate of wear, increasing the production of wear metal particlesExplanation
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.Rate this question:
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- 50.
During an OAP sample collection, using your mouth to draw oil up into the plastic tube could result in
- A.
Insufficient oil collection
- B.
Contaminated samples
- C.
A minor stomach ache
- D.
Paralysis or death
Correct Answer
D. Paralysis or deathExplanation
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.Rate this question:
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