2A651 Volume 2 Ure's

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  • 1/100 Questions

    What does fuel for an engine represent?

    • Thrust produced
    • Efficieny ratio
    • Potential energy
    • Availble horsepower
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2A651 Volume 2 Ure
About This Quiz

Explore the fundamentals of motion and energy in this engaging quiz designed for learners interested in physics. Assess your understanding of Newton's laws, energy concepts, and the behavior of gases in divergent ducts. Ideal for students preparing for advanced studies in physics.

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  • 2. 

    The two fluids combined to make up common jet fuel are?

    • Gasoline and oil

    • Kerosene and oil

    • Gasoline and water

    • Kerosene and gasoline

    Correct Answer
    A. Kerosene and gasoline
    Explanation
    Jet fuel is a specific type of fuel used in aircraft engines. It is a mixture of kerosene and gasoline. Kerosene provides the necessary energy and stability for the engine, while gasoline helps to improve the fuel's performance in extreme temperatures. This combination ensures that the fuel can withstand the high temperatures and pressures inside the aircraft engine, allowing for efficient and safe operation during flight.

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  • 3. 

    Stationary vanes positioned between rotor discs in a compressor are used to?

    • Direct air and increase pressure

    • Direct hot gases rearward

    • Increase backup pressure

    • Prolong compressor life

    Correct Answer
    A. Direct air and increase pressure
    Explanation
    Stationary vanes positioned between rotor discs in a compressor are used to direct air and increase pressure. These vanes act as a guide for the airflow, ensuring that it flows in the desired direction and is compressed effectively. By directing the air, the vanes help to increase the pressure within the compressor, which is essential for efficient operation. This allows the compressor to generate higher pressure levels, which are often necessary for various industrial processes and applications.

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  • 4. 

    Carbon monoxide gas is poisonous and odorless, and has

    • A reddish color

    • A greenish color

    • A yellowish color

    • no color

    Correct Answer
    A. no color
    Explanation
    Carbon monoxide gas is poisonous and odorless, which means it cannot be detected by smell. Additionally, it does not have any color, making it difficult to visually identify. This lack of color is one of the reasons why carbon monoxide can be so dangerous, as it can go unnoticed and easily be inhaled without any warning signs.

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  • 5. 

    The purpose of the exhaust duct is to?

    • Swirl exhaust gas-flow

    • Equalize exhaust gas-flow

    • Straighten exhaust gas-flow

    • Modulate exhaust gas-flow

    Correct Answer
    A. Straighten exhaust gas-flow
    Explanation
    The purpose of the exhaust duct is to straighten the exhaust gas-flow. This means that the duct is designed to ensure that the gas flows in a straight and smooth manner without any obstructions or turbulence. Straightening the gas-flow helps to improve the efficiency of the exhaust system and allows the gases to be expelled more effectively.

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  • 6. 

    The most commonly  used bearing removal tools include?

    • Drift pipes and hammers

    • Bearing pullers and hammers

    • Drift pipes and arbor presses

    • Arbor presses and bearing pullers

    Correct Answer
    A. Arbor presses and bearing pullers
    Explanation
    Arbor presses and bearing pullers are the most commonly used tools for removing bearings. Arbor presses are used to apply pressure to push the bearing out of its housing, while bearing pullers are used to grip and pull the bearing out. These tools are specifically designed for bearing removal and are effective in safely and efficiently extracting bearings from their assemblies. The other options, such as drift pipes and hammers, may also be used in some cases, but arbor presses and bearing pullers are the preferred and more commonly used tools.

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  • 7. 

    Which is not a method of heat transfer?

    • Radiation

    • Convection

    • Penetration

    • Conduction

    Correct Answer
    A. Penetration
    Explanation
    Penetration is not a method of heat transfer. Radiation, convection, and conduction are the three main methods of heat transfer. Radiation refers to the transfer of heat through electromagnetic waves, such as the heat we receive from the sun. Convection is the transfer of heat through the movement of fluids or gases, like the way heat is transferred in boiling water. Conduction is the transfer of heat through direct contact between objects, such as when a metal spoon becomes hot when placed in a hot liquid. Penetration, on the other hand, is not a recognized method of heat transfer.

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  • 8. 

    Fuel that accumulates after a failed start is?

    • Returned to the fuel control

    • Drained overboard by a drain system

    • Burned on the next start attempt

    • Allowed to evaporate

    Correct Answer
    A. Drained overboard by a drain system
    Explanation
    After a failed start, the fuel that accumulates needs to be removed from the system to prevent any potential issues. This is done by draining the fuel overboard using a drain system. This ensures that any excess fuel is safely removed from the aircraft and does not interfere with the next start attempt or cause any damage to the fuel control system.

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  • 9. 

    Before you install separable bearings, you must ensure the?

    • Rollers are servicable

    • Bearings are a matched set

    • Rollers are properly positioned

    • Parts are positioned and serviceable

    Correct Answer
    A. Bearings are a matched set
    Explanation
    Before installing separable bearings, it is important to ensure that the bearings are a matched set. This means that the bearings should be of the same size, type, and design. Using mismatched bearings can lead to uneven load distribution, increased friction, and premature wear, which can ultimately result in bearing failure. Therefore, it is crucial to verify that the bearings are a matched set before installation to ensure optimal performance and longevity.

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  • 10. 

    The ability to do work is the definition of?

    • Energy

    • Inertia

    • Friction

    • Velocity

    Correct Answer
    A. Energy
    Explanation
    Energy is defined as the ability to do work. It is a fundamental concept in physics and refers to the capacity of a system or object to perform work or transfer heat. In other words, energy is what allows objects to exert force and cause changes in their surroundings. In this context, inertia, friction, and velocity are not the correct definitions of the ability to do work.

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  • 11. 

    Which section of a jet engine introduction and burns fuel?

    • Turbine

    • Diffuser

    • Compressor

    • Combustion

    Correct Answer
    A. Combustion
    Explanation
    The correct answer is combustion. In a jet engine, the combustion section is responsible for burning the fuel. This is where the fuel is mixed with air and ignited, producing a high-temperature and high-pressure gas that expands and provides the necessary thrust to propel the aircraft forward. The combustion process is essential in converting the chemical energy of the fuel into mechanical energy, which powers the engine and enables flight.

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  • 12. 

    Where is the highest point of temperature reached in an engine?

    • Tailpipe

    • Exhaust cone

    • Turbine section

    • Combustion section

    Correct Answer
    A. Combustion section
    Explanation
    The highest point of temperature is reached in the combustion section of an engine. This is where the fuel and air mixture is ignited and combustion occurs, generating a high amount of heat and energy. The combustion section is designed to withstand and control these high temperatures, ensuring efficient combustion and power generation in the engine.

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  • 13. 

    After engine shutdown, fuel that accumulates in the t56 engine combustion section is?

    • Allowed to evaporate

    • Burned on the next start attempt

    • Vented overboard by drain valves

    • Returned to the fuel control by tubes

    Correct Answer
    A. Vented overboard by drain valves
    Explanation
    After the engine is shut down, the fuel that accumulates in the T56 engine combustion section is vented overboard by drain valves. This means that the excess fuel is released and expelled from the engine through specific valves designed for this purpose. This process helps to prevent any potential build-up or pooling of fuel in the engine, ensuring safe operation and preventing any potential hazards or damage.

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  • 14. 

    What is the most common type of fuel nozzle system?

    • Pressure-atomizing

    • Fuel-blasting

    • Fuel ejector

    • Fuel tube

    Correct Answer
    A. Pressure-atomizing
    Explanation
    The most common type of fuel nozzle system is the pressure-atomizing system. In this system, fuel is forced through a small nozzle at high pressure, which breaks it up into fine droplets. This allows for efficient combustion and better fuel atomization, resulting in improved fuel efficiency and reduced emissions. The pressure-atomizing system is widely used in various applications, including automotive engines, industrial burners, and aircraft engines.

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  • 15. 

    Of the following, the recommended method of expanding a bearing race before installation is to use a?

    • Hot-oil-bath

    • Coal furnace

    • Hydraulic-oil-bath

    • Oscillating heater

    Correct Answer
    A. Hot-oil-bath
    Explanation
    The recommended method of expanding a bearing race before installation is to use a hot-oil-bath. This is because heating the bearing race in a hot-oil-bath helps to expand the metal, making it easier to fit onto the shaft or housing. The hot oil provides even heating and allows for controlled expansion, ensuring a proper fit and preventing damage to the bearing race during installation.

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  • 16. 

    On an f100-pw-220 engine, the leading edge vanes are hollow?

    • To save weight

    • For better aerodynamics

    • To allow for variable movement

    • So that anti-icing air can flow through them

    Correct Answer
    A. So that anti-icing air can flow through them
    Explanation
    The leading edge vanes on an f100-pw-220 engine are hollow so that anti-icing air can flow through them. This is important because during flight, ice can accumulate on the leading edge of the engine, which can disrupt the airflow and potentially cause engine failure. By allowing anti-icing air to flow through the hollow vanes, the ice can be prevented from forming or can be melted off, ensuring the engine operates smoothly and safely.

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  • 17. 

    Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?

    • Elbow

    • Straight

    • Divergent

    • Convergent

    Correct Answer
    A. Divergent
    Explanation
    A divergent duct would decrease the velocity and increase the pressure of a gas as it passes through. This is because a divergent duct gradually increases in size, causing the gas to spread out and slow down. As the gas slows down, its pressure increases. Therefore, a divergent duct is designed to decrease velocity and increase pressure.

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  • 18. 

    The temperature of compressed air in a jet engine must be raised to?

    • Increase energy

    • Decrease energy

    • Increase volume

    • Decrease volume

    Correct Answer
    A. Increase energy
    Explanation
    The temperature of compressed air in a jet engine must be raised to increase energy. This is because increasing the temperature of the air increases its kinetic energy, which in turn increases the energy available for propulsion. By raising the temperature, the air molecules move faster and collide with more force, resulting in a greater thrust produced by the engine. This increase in energy is essential for the efficient functioning of the jet engine and to generate the necessary power for the aircraft to take off and maintain flight.

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  • 19. 

    Which engine component meters fuel for combustion?

    • P&D valve

    • Fuel pump

    • Fuel control

    • Fuel nozzles

    Correct Answer
    A. Fuel control
    Explanation
    The fuel control is responsible for metering fuel for combustion in an engine. It regulates the flow of fuel to ensure the correct amount is delivered to the combustion chamber. This component plays a crucial role in maintaining the proper fuel-to-air ratio for efficient combustion and optimal engine performance. The other options listed, such as the P&D valve, fuel pump, and fuel nozzles, are not directly involved in metering fuel for combustion.

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  • 20. 

    Vane-type fuel pumps used in jet engines are similar to?

    • Sliding-vane air compressors

    • Piston pump air compressors

    • Roots air compressors

    • Turbo-superchargers

    Correct Answer
    A. Sliding-vane air compressors
    Explanation
    Vane-type fuel pumps used in jet engines are similar to sliding-vane air compressors. Both types of pumps use a set of vanes that slide in and out of slots in a rotor to create a pumping action. This design allows for a smooth and continuous flow of fuel or air, making it efficient and reliable. The sliding-vane mechanism also helps to reduce noise and vibration, making it suitable for use in jet engines where precision and quiet operation are crucial.

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  • 21. 

    before inspecting new jet engine bearings, you should?

    • Separate the halves

    • Perform a spin check

    • Apply a preservative coating

    • Remove a preservative coating

    Correct Answer
    A. Remove a preservative coating
    Explanation
    Before inspecting new jet engine bearings, you should remove a preservative coating. This is because new bearings are typically coated with a preservative to protect them during storage and transportation. Removing this coating allows for a thorough inspection of the bearings to ensure they are in proper condition before being installed in the engine.

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  • 22. 

    Which component reduces the engine rotor speed to the revolutions per minute(rpm) required for accessories?

    • step motors

    • Reduction motor

    • Reduction geartrain

    • Gear case drive assembly

    Correct Answer
    A. Reduction geartrain
    Explanation
    The reduction geartrain is responsible for reducing the engine rotor speed to the required revolutions per minute (rpm) for accessories. This component is designed to decrease the rotational speed and increase the torque output, allowing the engine to efficiently power the various accessories in a vehicle. By utilizing gears of different sizes, the reduction geartrain effectively lowers the speed of the engine rotor, ensuring that the accessories receive the appropriate rpm for their operation.

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  • 23. 

    What is the most probable cuase of a flameout of a jet engine flying at 40,000 feet with a constant engine rpm of 50 percent?

    • The rpm is too low

    • A decrease in barometric pressure

    • The failure of the breather pressurizing valve

    • Excessive ducting of air from the compressor into the combustion chamber

    Correct Answer
    A. The rpm is too low
    Explanation
    The most probable cause of a flameout of a jet engine flying at 40,000 feet with a constant engine rpm of 50 percent is that the rpm is too low. When the engine rpm is too low, there may not be enough fuel-air mixture in the combustion chamber for the engine to sustain combustion, leading to a flameout.

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  • 24. 

    The parts on a can-annular combustion section must be removed in a specific order because of the?

    • Fuel nozzle

    • Transition liner

    • Combustion chamber outer cases

    • Combustion chamber crossover tubes

    Correct Answer
    A. Combustion chamber crossover tubes
    Explanation
    The combustion chamber crossover tubes must be removed in a specific order because they connect the different combustion chambers within the can-annular combustion section. Removing them in the wrong order could disrupt the flow of fuel and air, leading to inefficient combustion and potential damage to the engine.

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  • 25. 

    Which type of defect appears on bearings as a result of bearing parts striking together?

    • Nicks

    • Galling

    • Grooves

    • Scratches

    Correct Answer
    A. Nicks
    Explanation
    Nicks are a type of defect that appears on bearings as a result of bearing parts striking together. These nicks are small chips or dents that can occur on the surface of the bearing due to excessive force or impact. They can lead to increased friction, reduced performance, and ultimately, failure of the bearing. Nicks are typically caused by improper handling, installation, or maintenance of the bearing.

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  • 26. 

    The air temperature of a jet engine gradually rises across the compressor to the diffuser outlet as a result of?

    • Compression

    • Fuel expansion

    • Turbine discharge

    • Ambient temperature increase

    Correct Answer
    A. Compression
    Explanation
    The correct answer is compression. As the air passes through the compressor of a jet engine, it is compressed, which causes an increase in temperature. This compression is achieved by using rotating blades to increase the pressure of the air, leading to a rise in temperature. Therefore, the air temperature gradually rises across the compressor to the diffuser outlet as a result of compression.

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  • 27. 

    What is the most chemically correct ratio for burning fuel in a combustion chamber?

    • 10:1

    • 10:4

    • 15:1

    • 15:4

    Correct Answer
    A. 15:1
    Explanation
    The most chemically correct ratio for burning fuel in a combustion chamber is 15:1. This means that for every 15 parts of air, there is 1 part of fuel. This ratio ensures that there is enough oxygen present to completely burn the fuel, resulting in efficient combustion and minimal emissions. A ratio of 15:1 provides the ideal balance between fuel and air, maximizing energy release while maintaining a stable and controlled combustion process.

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  • 28. 

    What type of flame speed are swirl-type fuel nozzles normally used to provide?

    • High

    • Low

    • Medium

    • Medium-high

    Correct Answer
    A. High
    Explanation
    Swirl-type fuel nozzles are typically used to provide a high flame speed. The swirling motion created by these nozzles helps in better fuel-air mixing, resulting in a more efficient combustion process. This increased flame speed leads to a higher heat release rate, which is beneficial in applications where rapid and intense combustion is required, such as in industrial furnaces or certain types of engines.

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  • 29. 

    Which method of attaching the turbine blades (buckets) to the turbine rotor disc is used most frequently?

    • Turbine blades fitted solidly into the rim of the rotor disc

    • Rivet placed in a hole through the base of the turbine blade

    • Close-fitting shroud ring around the outer perimeter of the disc

    • Series of grooves or notches broached in the rim of the turbine rotor disc

    Correct Answer
    A. Series of grooves or notches broached in the rim of the turbine rotor disc
    Explanation
    The most frequently used method of attaching turbine blades to the turbine rotor disc is by using a series of grooves or notches broached in the rim of the disc. This method provides a secure and reliable connection between the blades and the disc, allowing for efficient power transfer and minimizing the risk of blade detachment during operation. Additionally, the use of grooves or notches allows for easy replacement of individual blades if necessary, without requiring the entire disc to be replaced.

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  • 30. 

    To cause an accessory in a jet engine to operate at its most optimum speed, design engineers must?

    • Change the gear ratio

    • Change the govenor settings

    • Install an additional set of drive gears

    • Adjust the operating speed of the engine

    Correct Answer
    A. Change the gear ratio
    Explanation
    To cause an accessory in a jet engine to operate at its most optimum speed, design engineers must change the gear ratio. This is because the gear ratio determines the relationship between the speed of the engine and the speed at which the accessory operates. By adjusting the gear ratio, engineers can ensure that the accessory operates at the desired speed, maximizing its efficiency and performance. Changing the governor settings or adjusting the operating speed of the engine may not directly impact the speed of the accessory, while installing an additional set of drive gears may not be necessary if the desired speed can be achieved by simply changing the gear ratio.

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  • 31. 

    How many different type of loads can be imposed on a jet engine bearing?

    • Two

    • Three

    • Four

    • Five

    Correct Answer
    A. Three
    Explanation
    There are three different types of loads that can be imposed on a jet engine bearing.

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  • 32. 

    The "fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc is preferred because?

    • Of the temperature differential between the turbine rotor disc and the blades

    • It aids in preventing horizontal movement of the blades

    • There is more blade tip shake during engine operation

    • It aids in preventing axial movement of the bucket

    Correct Answer
    A. Of the temperature differential between the turbine rotor disc and the blades
    Explanation
    The "fir tree" method of attaching turbine blades to the turbine rotor disc is preferred because of the temperature differential between the turbine rotor disc and the blades. This method allows for a secure and tight fit between the blades and the disc, preventing any movement or loosening of the blades due to the expansion and contraction caused by the temperature difference. This ensures the efficient and safe operation of the turbine.

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  • 33. 

    What happens to the energy that is absorbed by the turbine wheel?

    • 50 percent is used for accessories

    • 60 percent is used for accessories

    • The energy operates the anti-ice system

    • The energy is returned to the compressor

    Correct Answer
    A. The energy is returned to the compressor
    Explanation
    The energy that is absorbed by the turbine wheel is returned to the compressor. This means that the energy is not lost or wasted, but rather recycled back into the system to be used again. By returning the energy to the compressor, it can be used to continue the cycle of generating power and driving the turbine. This ensures maximum efficiency and utilization of the energy in the system.

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  • 34. 

    Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?

    • Pits

    • Bands

    • Grooves

    • Brinelling

    Correct Answer
    A. Grooves
    Explanation
    When small particles of foreign material become lodged between the rollers of a bearing, it can lead to the formation of grooves. These grooves are a type of defect that can occur on the surface of the bearing. The presence of these grooves can cause uneven wear and tear on the bearing, leading to reduced performance and potentially causing the bearing to fail prematurely. Therefore, grooves are a common type of defect that can occur due to the presence of foreign particles in bearings.

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  • 35. 

    The t700 engine has a modular concept that allows for the replacement of entire?

    • Motors

    • Systems

    • Subsystems

    • Components

    Correct Answer
    A. Subsystems
    Explanation
    The T700 engine has a modular concept, which means that it is designed in a way that allows for the replacement of entire subsystems. This means that if a particular subsystem of the engine is damaged or needs to be upgraded, it can be easily replaced without having to replace the entire engine. This modular design enhances maintenance and repair capabilities, reduces downtime, and improves overall engine performance.

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  • 36. 

    What routes oil and fuel through the t700 engine accessory gearbox (agb)?

    • Internal lines

    • External lines

    • Internal passages

    • External passages

    Correct Answer
    A. Internal passages
    Explanation
    The T700 engine accessory gearbox (AGB) routes oil and fuel through its internal passages. These passages are designed to transport the necessary fluids within the engine, ensuring proper lubrication and fuel supply. The internal passages are an integral part of the engine's functioning, allowing for the smooth operation and performance of the T700 engine.

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  • 37. 

    Which method of producing thrust does a turboprop engine use?

    • Using only the energy expended through the exhaust nozzle to propel the aircraft forward

    • Using the same working fluid for propulsive force as that used within the engine

    • Accelerating a large mass of air through a small velocity change

    • Moving a small quantity of air through a large velocity change

    Correct Answer
    A. Accelerating a large mass of air through a small velocity change
    Explanation
    A turboprop engine uses the method of accelerating a large mass of air through a small velocity change to produce thrust. This means that the engine uses a propeller to move a large amount of air at a relatively low speed, resulting in a small change in velocity but a significant amount of thrust. This method is efficient for aircraft that operate at lower speeds and require a high level of fuel efficiency.

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  • 38. 

    A jet engine derives its name from its design in that it uses?

    • Turbo-superchargers within the engine

    • A turbine-type compressor to maintain power

    • Nozzles which are called jets within the engine

    • A gas-driven turbine wheel to drive its compressor

    Correct Answer
    A. A gas-driven turbine wheel to drive its compressor
    Explanation
    A jet engine uses a gas-driven turbine wheel to drive its compressor. This means that the engine has a turbine wheel that is powered by the flow of hot gases, which in turn drives the compressor. The compressor then compresses the incoming air, which is mixed with fuel and ignited, creating the necessary thrust for the jet engine to propel an aircraft forward. This design allows the engine to generate the power needed for flight by utilizing the energy from the gas-driven turbine wheel.

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  • 39. 

    External flanges on the f100 engine are referred to by?

    • Letter designations

    • Number designations

    • Directional references

    • Accessories references

    Correct Answer
    A. Letter designations
    Explanation
    The external flanges on the F100 engine are referred to by letter designations. This means that each flange is identified and labeled using letters, rather than numbers, directional references, or accessories references. Using letter designations allows for clear and organized identification of the different flanges on the engine, making it easier for maintenance and repair purposes.

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  • 40. 

    On an f100-pw-220 engine, the no.2 bearing package is housed in the?

    • Compressor intermediate case

    • Combustion case

    • Fan inlet case

    • Diffuser case

    Correct Answer
    A. Compressor intermediate case
    Explanation
    The correct answer is the compressor intermediate case. The compressor intermediate case is the part of the engine that houses the no.2 bearing package. This case is located between the fan inlet case and the combustion case. It plays a crucial role in supporting and maintaining the proper alignment of the bearings, ensuring the smooth operation of the engine.

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  • 41. 

    Which type of horsepower is delivered to the propeller for useful work?

    • Brake

    • Indicated

    • Frictional

    • Equivalent shaft

    Correct Answer
    A. Brake
    Explanation
    The type of horsepower that is delivered to the propeller for useful work is brake horsepower. Brake horsepower refers to the actual power output of an engine or motor, measured at the output shaft. It represents the power available for doing useful work, such as turning the propeller in this case, after accounting for losses due to friction and other factors.

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  • 42. 

    Which condition reduces the efficiency of a centrifugal compressor?

    • Resultant velocity

    • Tangential velocity

    • Pressure pulsations

    • Air mass leaving the impeller at great velocities

    Correct Answer
    A. Pressure pulsations
    Explanation
    Pressure pulsations can reduce the efficiency of a centrifugal compressor. These pulsations occur when there are fluctuations in the pressure of the compressed air, causing uneven flow and turbulence within the compressor. This can lead to increased energy losses and decreased overall efficiency of the compressor.

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  • 43. 

    The precentage of combustion efficiency of a gas turbine is usually between?

    • 60 and 70

    • 65 and 75

    • 75 and 95

    • 95 and 100

    Correct Answer
    A. 95 and 100
    Explanation
    Gas turbine combustion efficiency refers to the ratio of the heat energy produced by the combustion process to the energy input from the fuel. A high combustion efficiency indicates that a greater percentage of the fuel's energy is being converted into useful work. Therefore, a gas turbine's combustion efficiency is typically expected to be between 95 and 100 percent, as this range represents a highly efficient and effective combustion process.

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  • 44. 

    F108 structural rigidity is obtained with a short length and by having only two main structures that are called?

    • Mainframes

    • Primary frames

    • Secondary frames

    • Intermediate frames

    Correct Answer
    A. Mainframes
    Explanation
    Structural rigidity is achieved by using mainframes, which are the two main structures in the given context. These mainframes, due to their short length and specific design, provide the necessary stability and strength to the overall structure. The other options, such as primary frames, secondary frames, and intermediate frames, are not mentioned or relevant in the given explanation.

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  • 45. 

    On the f119-pw-100 engine, which of the following is not attached to the gearbox assembly?

    • Main fuel pump

    • Engine generator

    • Actuator fuel pump

    • Augmentor fuel control

    Correct Answer
    A. Augmentor fuel control
    Explanation
    The augmentor fuel control is not attached to the gearbox assembly on the F119-PW-100 engine. The main fuel pump, engine generator, and actuator fuel pump are all components that are typically attached to the gearbox assembly. However, the augmentor fuel control is a separate component that is not directly connected to the gearbox assembly.

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  • 46. 

    The torque shaft can recouple to the reduction gearbox (rgb), if torque decreases below approximately?

    • 9,000 inch pounds

    • 6,000 inch pounds

    • -6,000 inch pounds

    • -9,000 inch pounds

    Correct Answer
    A. -6,000 inch pounds
    Explanation
    The torque shaft can recouple to the reduction gearbox if the torque decreases below approximately -6,000 inch pounds. This means that once the torque drops below this value, the torque shaft can reconnect to the reduction gearbox to transfer power.

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  • 47. 

    What directs the gases onto the first-stage turbine wheel blades in a jet engine?

    • Turbine wheel blades

    • Combustion chamber

    • Turbine stator

    • Flameholder

    Correct Answer
    A. Turbine stator
    Explanation
    The turbine stator directs the gases onto the first-stage turbine wheel blades in a jet engine. The stator is a stationary component that is located between the combustion chamber and the turbine wheel. Its purpose is to guide and direct the flow of hot gases from the combustion chamber onto the turbine blades. By controlling the flow of gases, the stator helps to optimize the efficiency and performance of the turbine, ultimately contributing to the overall operation of the jet engine.

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  • 48. 

    Which component in the augmentor creates local turbulence and reduces gas velocity?

    • Spraybars

    • Flameholder

    • Screech liner

    • Fuel manifold

    Correct Answer
    A. Flameholder
    Explanation
    The flameholder is the component in the augmentor that creates local turbulence and reduces gas velocity. It is designed to stabilize the flame and enhance combustion efficiency. By disrupting the flow of gases, the flameholder promotes mixing and ensures that the fuel-air mixture is thoroughly burned. This turbulence helps to maintain a stable flame and prevent flame blowout.

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  • 49. 

    What are used to retain the turbine buckets in the first-stage wheel of the t56-a-15 engine?

    • Cotter pins

    • Curvic splines

    • Cover plate seals

    • Anti-rotation pins

    Correct Answer
    A. Cover plate seals
    Explanation
    Cover plate seals are used to retain the turbine buckets in the first-stage wheel of the T56-A-15 engine. These seals provide a secure and tight seal between the cover plate and the turbine buckets, preventing any leakage or loss of efficiency. They help to maintain the integrity and performance of the turbine system by ensuring proper alignment and stability of the buckets within the wheel.

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  • Mar 20, 2023
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  • Sep 25, 2012
    Quiz Created by
    Hamandcheese
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